9 Best Tankless Hot Water Heaters – Your 2017 Guide

So you’re looking for the best tankless hot water heater?

Then you’ve definitely come to the right place. As an alternative to those bulky, costly and wasteful water tanks, tankless water heaters are quickly taking the nation by storm. As opposed to storing unnecessarily large hot water volumes, tankless heaters work by simply heating cold water in a matter of seconds as it passes through – see the difference?Rheem RTG-64XLN 6.4 GPM

Since you’re here, you’ve probably heard about all the wonderful benefits that these heaters bring into our homes and businesses. In addition to providing us with a continuous supply of hot water, tankless heaters have been known to last longer than tanked heaters. But that’s not all; a decent tankless heater will also save you a sizeable chunk of change on power and gas bills every month.

Sounds impressive, right?

I’m sure you see where we’re going with this. If you’re in the market for a great heater, we’ve done the hard yards and found the top 10 most popular tankless water warmers on the planet.

Marey Power Gas 10L Digital Panel Tank-less Water Heater 

Marey Power Gas 10L Digital Panel Tankless Water HeaterDon’t you just hate it when that electric bill comes at the last stretch of the month, and it’s like you’ve been paying for the entire neighborhood?

The Marey Power Gas 10L Digital Panel Water Heater is designed to deliver an endless supply of hot or warm water with optimum energy efficiency. And what’s even more interesting is that you’ll never have to use your electricity to heat water again. Furthermore, the tankless heater from Marey is incredibly straightforward and easy to install and operate.

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  • Specification

Marey Power Gas 10L Digital Panel Tankless Water Heater

Marey Power Gas 10L Digital Panel Tankless Water Heater delivers endless hot water with optimal energy efficiency! No electricity required! The Marey Power Gas 10L Digital Panel Tankless Water Heater ...

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I read so many reviews before buying this water heater. I own an old apartment building and each unit has it's own water heater. I was looking at $1000 to $1500 units and then realized all of them required 3/4" gas lines. NO GO. The great thing about this unit is that it uses a 1/2" gas line. I was not about to bust a bunch of walls open. I do my own installation and I know that black gas pipe is a hassle. When I looked at the Marey, I realized it had limitations. The expensive units are very sensitive so even a trickle of water makes them light. But most tenants want showers. Few "trickle" water. I also didn't want to install 110v power at every location. That would be expensive! This unit was amazing. It uses D cells to ignite the gas. This was confusing at first but once I installed it, the unit operated exactly as expected. For a rental this is perfect. Tenants were told to open the faucet at a sink "full" so they would get the unit lighting correctly. For showers, it always lights instantly because the GPM is large enough at the shower head to make it work well. If you are a manager of an apartment, this unit is for you. Take out the old water heater. Paint the enclosure nicely so it does not look like crap. I setup a 2x4 backer with a cement board fire barrier. Not required, but I wanted some air gap. Then I used common galvanized vent and standard appliance hoses to install it. Appliance hoses were what the factory recommends and they worked perfectly. Use braided stainless hoses for the best look. After installing these I would never go back. Even for a small house with one or two bathrooms this is a great unit. Despite the reviews, the water is very hot. You have to learn the settings. I set it for Winter all year round because that gives a very hot water experience. I also set the water flow down to force ignition at a lower GPM. Overall, I could not be happier. For under $300 I installed a tankless by myself. The unit hangs with a mere few screws and it less than 30lbs. Very, very light. The batteries have been working for at least six months so don't fear, they work well. And I used Duracell. Remember the batteries only ignite the gas. They don't heat the water. Another thing that may confuse you. I highly recommend this for anyone.Important tip: For buildings with high water pressure, and if you do not have access to adjust the pressure regulator, then install one as pictured in-line just before the cold water supply.
March 1, 2015
Great product. This lil lp heater beats solar and electric in efficiency in my opinion. You may need to hunt down some fittings as my house lines were 3/4" and the unit is 1/2". The flame window is pretty cool. Water gets hot in less than a min. Gas is only used while the hot water is running. Wish I found this product years ago. Would definitely buy again.
January 23, 2016
This water heater is worth every penny it may cost, which is very little. I bought this unit to install in a Tiny House I built for my daughter. It has impressed me with the quickness of heating water. Having the igniter run with 2 D batteries aids in the decreasing the overall weight by requiring less wiring. Yes, that is not much weight but in a Tiny House every pound counts. I would highly recommend this for a Tiny House. Just make sure you have good venting, like the 4" Horizontal Stainless Steel Z-Vent https://www.amazon.com/dp/B00E0Q3SU4/ref=cm_cr_ryp_prd_ttl_sol_2 and a way for fresh air to enter into the area the unit is installed.
August 22, 2016

Other features to look forward to include:

Features:

  • Energy saving design that instantly heats up cold water in mere seconds as it flows. The heater activates as soon as the water begins to flow.
  • Available in a range of models such as LP and other natural gas models.
  • Incorporates adjustable water and gas control knobs to get the perfect temperature for different tasks.
  • Has a digital panel that displays the temperature of outcoming water among other statistics.
  • Boasts of an applicable water pressure of 3.6 – 145 PSI hot water output per minute. That makes for slightly over 3 gallons every 60 seconds.
  • Includes safety features such as anti-combustion and gas pressure safety protection.

Conclusion

All in all, the Marey Power Gas 10L Digital Panel Water Heater is the ideal appliance for anyone looking for an affordable and energy efficient heating solution. With its automatic ignition and simplistic design, the heater is already a shoe in for use in many households.

Similarly, our customers who are more environmentally conscious will be impressed with the heater’s gas and water saving capabilities. And while the batteries aren’t included, they won’t be running out soon since their only job is just starting the heater and not heating the water.

However, we have to point out the fact that the Marey Power Gas 10L Tankless H2O Heater might be a bit disadvantaged in larger households with an acute demand for hot water.

PROS:
  • Smaller Gas Line Specs – The fact the Marey Power Gas 10L Digital Water Heater only uses a 1/2” gas line as opposed to others that use 3/4” means that you won’t have to bust some walls open.
  • Energy Saving Design – This particular heater boasts of about 54 to 87 % energy efficiency thanks to adjustable water and gas control.
  • The Marey Warmer is by far the cheapest option in the market and even probably on this list too.
  • This tankless heater has one of the lowest installation costs compared to other models.

CONS:
  • Low Output – At only 3.1 GPM, the Marey heater has a considerably limited water production. This means that simultaneous showers are definitely out of the question.
  • Issues in Cold Climates – If you reside in slightly colder regions, you may have to switch to low-flow fixtures.

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Rinnai Natural Tankless Water Heater RL75iN

Rinnai RL75iN Natural Gas Tankless Water HeaterHands up if you’re fed up with those smaller tankless heaters and their even lower flow rates. Don’t worry; we’ve all been there. If you’re trying to run a business that needs a steady supply of hot water or have a generously sized family (in which case you’re still in the family business), then you obviously need a heater built for the job.

Want to learn more?

The Rinnai Natural Tankless Water Heater RL75iN not only comes with two different flow rates, but it also sports an impressive BTU of 180,000.

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  • Specification

Rinnai RL75iN Natural Gas Tankless Water Heater, 7.5 Gallons Per Minute

Rinnai Residential/Commercial Tankless Water Heater, Interior, max. Btu 180,000, 7.5gpm w/Valve Kit Silver

Available: In stock
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Part Number

RL75iN

Item Weight

50 pounds

Product Dimensions

14 x 9.3 x 23 inches

Origin

Japan

California residents

Click here for Proposition 65 warning

Item model number

RL75iN

Size

Large

Color

Silver

Finish

Natural Gas

Item Package Quantity

1

Certification

Energy Star

Batteries Included?

No

Batteries Required?

No

Warranty Description

12-Year Warranty on Heat Exchanger, 5 Year Parts, 1 Year Labor for Residential Installations

The Rinnai water heater works well and saves energy but there are some issues that are specific to these water heaters and I am going to tell you the whole truth.Venting: The exhaust/combustion air vent is tested and listed for the unit and you can't use any other vent. It uses outside air for combustion and is very safe. The direct vent sealed combustion vent allows Rinnai to be installed in bath rooms and bed rooms where traditional B-Vent water heaters cannot. There are limitations of how far away and were you can terminate the vent, check out the installation manual for that.Hot Water: It will make endless hot water until you turn off the tap, a minute, an hour, a week. It can only supply so much at a time, depending on your cold water temperature it will only run two or three fixtures at once. It is an `on demand' water heater, not an `instant' water heater, hot water will take longer to arrive at the fixture than it will from a tank water heater.Gas Supply: These water heaters use less fuel than a tank style water heater but when they want fuel, they want it now. Your tank style water heater required a gas supply of about 40,000 btu's per hour, your Rinnai will require 180 to 199,000 btu's per hour. Check you gas supply lines to make sure they have enough capacity for the new load or your new water heater won't perform to its potential without upgrading the supply line.Expect some maintenance: This is an energy saving, high tech machine with a combustion fan, pc board and electronic solenoid valves to control water and gas flow. Your water quality will also determine how often the unit will need to be flushed, generally every one or two years. Flushing is done by using a small pump to circulate a solution through the unit to dissolve calcium deposits that form inside the heat exchanger. You should flush a tank style water heater too but most people don't. If you don't flush your tank less water heater the efficiency will be reduced and you may get inconsistent water temperatures. In the worst case it could plug the heat exchanger or cause it to leak requiring replacement.Finding service: This point can be a little sticky. Rinnai's warranty isn't affected by internet purchases but your online retailer won't be much help. Rinnai has an online dealer locater but if you haven't purchased the appliance from that dealer it is a little like bringing your own steak to the restaurant, they may cook it for you but they won't guarantee the results. Be prepared to pay the service man and fight Rinnai for reimbursement or buy locally.Hope this helps.
June 11, 2013
This is a fantastic unit, but know that it requires a 3/4 in. gas pipe. I'm sure that requirement was somewhere in the description, but I missed it. Lucky for me, there was a 2 in. gas pipe right above where this was going to go and we were able to just replace the 1/2 in. gas line that went to the old water heater with a 3/4 in. one for not too much money. If you are not a master plumber, I would recommend getting a very good plumber to install this for you. If they're good, it won't be cheap, but it will be worth it. We've had this just short of a year now and we've turned the temperature down twice. It really works exceedingly well and so far has been trouble free.
July 30, 2014
I did a little research on this product and found it to be the one I needed. The price was good also. I replaced my water heater with it and found it did a great job for providing continuous Hot water. It came with the Hot & Cold special valves that made the connection easy. I installed it in the basement attached to the basement wall next to the House heating system. That way all the equipment can be located in a central place. All I had to do is attach all piping (electrical outlet, water, gas, & exhaust pipes) and turn it on. Then I had to adjust temp to higher setting so water will be hot at most distant bath location. I worked great. No other adjustments needed.
December 11, 2016

Want to learn more? Then have a gander at the RL75iNs top features:

Features:

  • Delivers an impressive flow rate of up to 7.5 gallons of pure hot water per minute.
  • Comes with between 10,000 to 180,000 BTU which is more than ideal for homes with more than 2 bedrooms.
  • Makes use of both LP as well as natural gas to power up.
  • Sealed combustion system for effective, energy saving water heating.
  • Comes with a ton of safety elements such as boiling protection, thermal fuse, automated frost protection, over current protection and drain line.

Conclusion

Can I be totally honest with you?

The Rinnai Natural Tankless Water Heater RL75iN might just be one of the best and most convenient tankless heaters on the market, but there’s one particular element that has users complaining.

It’s a well-known fact that Rinnai water heaters are among the most expensive pieces of equipment, but as always, you tend to get what you paid for. So we can definitely expect very high-quality components and service from this bad boy.

Moreover, the fact that this indoor tankless heater can literally be installed anywhere makes it as convenient as it gets. But don’t take my word for it – get one for yourself and see what we’re talking about.

 

PROS:
  • Boasts of 82 percent thermal efficiency thanks to the sealed combustion system for effective, energy saving water heating.
  • Comes with residential and commercial heating ranges of 98 degrees to 160 degrees F
  • The heater delivers 7.5 gallons of hot water a minute, making it possible for simultaneous showers.
  • The small size of 14 x 23 x 9.3 inches allows this Rinnai tankless heater to be flexible enough for wall-mounted installation which is very valuable and space-saving.
  • Can be converted to propane for those who do not like natural gas.

CONS:
  • Some customers sighted that the Rinnai RL75iN Tankless Heater might have a slight 30-second delay of water flow at the tap.
  • The entire system will require very careful and demanding installation procedures.
  • As the water temperature climbs, the indoor RL75i tends to decrease its GPM.

Rinnai Natural Tankless Water Heater RL75iN

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Eccotemp High-Capacity FVI-12-LP Propane Tankless Heater

Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater

Don’t you just hate it when your electricity bill gets so high that it’s like you’re running an assembly plant in your living room?

Yeah, I’m sure we all know the feeling. Especially to those of us who still use massive water tanks and energy guzzling heaters. If you’re looking to live a greener and more eco-friendlier life, then it’s definitely time to get the Eccotemp FVI-12-LP Tankless Heater. The FVI-12-LP is a liquid propane fired, forced vent indoor heater that is engineered for average hot water production for those of us who need plenty more than just one hot water application.

But is this all the unit boasts of, or is there more to it than meets the eye? Maybe the following features will help shed some light.

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  • Specification

Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater

No more cold showers! At the cabin or around the house... never run out of hot water again! The incredibly efficient Eccotemp Power-vent Water Heater uses an intense propane flame to instantly heat ...

Available: In stock
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Part Number

FVI-12-LP

Item Weight

20 pounds

Product Dimensions

4 x 15 x 24 inches

Origin

China

California residents

Click here for Proposition 65 warning

Item model number

FVI-12-LP

Size

11-50 Gallons

Color

White

Power Source

gas-powered

Voltage

110 volts

Item Package Quantity

1

Flow Rate

3.6 GPM

Maximum Pressure

80 PSI

Certification

UL

Batteries Included?

No

Batteries Required?

No

Warranty Description

2 Year Warranty Heater

As long as nothing goes wrong with this unit, you'll love it. If it fails for some reason, you'll just get the runaround from customer service, and all that love will disappear. This water heater had some great features compared to the Bosch it replaced, and it worked well for a few months. Then it sprung a pinhole water leak in the heat exchanger tubing. The leak was right on the bend in the tubing, a natural weak spot, and appears to just be where the water pressure wore away at it until it broke. My husband removed the unit so we could at least restore cold water flow until we could get a replacement. I e-mailed the customer service address in the manual to ask how you go about a warantee exchange. They replied by e-mail that I would need to call them, because they had questions. My husband called customer service. Their brilliant analysis was that the unit had to have frozen from cold air coming down the vent on a 31 degree night. Really? Inside the warm house? Come on! If that is the case, what is going to happen to the unit on the other end of the house when we get to the actual cold weather, below zero? I guess we get to look forward to some major water damage. They couldn't stand by their warantee, because it just had to be our fault that their product failed, but, hey, they will kindly sell us a replacement at a discount. What kind of warantee is that!?! Buy at your own risk- maybe it will work great and you'll have no problems. But if you have a problem, the warantee isn't going to apply, and you'll be stuck with buying a replacement.Update: We never were able to get this company to back their warantee, and got tired of arguing with them. We ended up having the pinhole repaired, and that lasted about a month. Then, a new pinhole leak started in another place in the tubing. Water sprayed all over the electronic connections, ruining them as well. We've had it with this piece of junk, and won't be repairing it again just to wait for the next leak. Do not waste your money on this product!
November 8, 2011
I gave this product a five star review BUT READ THIS FIRST. The product worked absolutely fantastic. However, after I left the basement door open when the outside temp was -10 degrees F. the system exploded. It was a violent explosion and caused a lot of damage to my plumbing and water well system. There was no over temp or over pressure safety cutoff on the system and this makes it dangerous. If someone was in the basement when this explosion happened, they would be seriously injured. I have reordered the system because it was a tremendous energy saver and it worked great. It is also a huge space saver too over the old hot water system. So BE ADVISED that there is a danger in the system and this unit does not meet safety requirements for freezing situations. C. Jeff Dyrek, Webmaster, Arctic Explorer, Disabled Vet.
December 29, 2015
Wanted to wait a while until offering a review on this water heater. It's been in my 29' travel trailer for about 3 months now. It installed very easily. I suppose I understand why it's not recommended for MY use, but, then again, I also understand how sue happy people can be over the stupidest things. That said, I am VERY happy with how this little beauty performs. Getting the water temperature right can be a bit fussy and take half a dozen uses before you get it dialed in, but it excels at delivering unlimited hot water in about 5 seconds to the furthest part of my trailer, and the shower is nearly instant (mounted in the bedroom next to the shower). It appears to "sip" propane, and doesn't intrude into the limited space one has in a travel trailer. Heat from the unit is NOT an issue. I can nearly hold my hand on the vent pipe when it's running, and it does not get hot enough to ignite anything due to the power venting. It's very quiet, ignites instantly when it senses water flow. The fan continues to run for 5 or 10 seconds after the flame is stopped.If it holds up as well as it performs, it's an absolute winner in my book.Should I encounter any issues, I'll update this review.UPDATE: Still deserves 5 stars. It amazes me how little propane it uses. I started with a full 20 gal tank and STILL have about 3/4 of it remaining. During the warm weather, I had to lower both settings to account for the warmer water coming into the unit, which is really easy.
April 24, 2016

Features:

  • The Eccotemp FVI-12-LP comes with a digital temperature display with fully independent water and gas controls.
  • Eccotemp really impressed us with their unit’s sleek, and super modern design.
  • Comes with genuine 1/2” NPT fittings.
  • Measures 4 by 15 by 24” and weighs only 20 pounds.
  • Requires only 75,000 BTU while offering us about 100 volts.
  • Comes with a max flow rate of around 3.4 gallons per 60 seconds.

 

Conclusion

Small, versatile, high powered and super eco-friendly, the Eccotemp FVI-12-LP Tankless Heater is the ideal match for cottages, vacation cabins as well as small to medium homes. But that’s not all! The mere fact that this model comes ready to install straight out of the box makes things so much easier for us.

Not to forget!

Depending on your lifestyle and intended application, you can also opt to use a 20-100 pound propane tank. But as with all other gas powered tankless water heaters, you’ll still have to find a way to vent out the exhaust. Fortunately, Eccotemp was thoughtful enough to include a stainless steel kit for venting that we can quickly set up for wall or ceiling venting.

 

PROS:
  • Incredibly energy efficient requiring only 2 Watts 1 amp during operation.
  • The Eccotemp High-Capacity FVI-12-LP Propane Tankless Heater is small and compact enough for use even in the smallest cabins.
  • After seeing some of the other price tags on our list, the Eccotemp FVI-12-LP is by far one of the most affordable units you will find out there.
  • Comes with an array of safety features for safe operation.
  • GPM is high enough for at least 2 bathrooms as well as demand for sinks, shows, dishwashers and other applications.

CONS:
  • Due to its smaller size, homes with more than 2 bathrooms will find it hard to satisfy demand for hot water.
  • You guessed it; you’ll need to set up and make room for a venting system to exhaust the fumes.
  • We might not be quite sure what this says about the quality, but the Eccotemp FVI-12-LP does not come with a lifetime warranty.
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SioGreen Quartz Elements IR245 POU Infrared Elec Tankless H2o Heater

SioGreen IR245 POUNow, how many of you here would love to save even more money on a cheap tankless water heater? We guessed as much; that’s why we’ve taken things down a notch with the SioGreen Quartz Elements IR245 POU Infrared Elec Tankless H2o Heater.

Needless to say!

This particular model goes as far as saving you money even as you use it. But does the fact that the IR245 POU water heater comes cheap mean that you get less quality service and performance?

  • Product
  • Specification

SioGreen IR245 POU 4.5kW,240V,20A. 1.2GPM@30¡F Rises or 0.6GPM@60¡F Rise. Infrared Electric Tankless...

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Available: In stock
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Part Number

SG-IR245-POU

Item Weight

6.8 pounds

Product Dimensions

14 x 12.4 x 4.2 inches

Origin

USA

Item model number

IR-245 POU

Size

2) IR245 POU 20amps/4.5kW/240v

Style

2) IR245 POU 20amps/4.5kW/240v

Power Source

AC

Voltage

240 volts

Wattage

4.5 KW

Item Package Quantity

1

Temperature Range

55 °C

Flow Rate

2 GPM

Special Features

Water connections: 1/2" NPS, Read map sizing guide before purchase

Usage

Commercial/Residential

Included Components

Water Adjust Valve, Wall Mount bracket, Rubber washer filter screen.

Batteries Included?

No

Batteries Required?

No

This water heater is doing a great job for me so far. However, I asked specifically if it had 3/4 inlet and outlet or 1/2 inch before I bought it. You can probably find that in the questions asked section. The SuperGreeen rep said that it was 3/4 inch so I bought it, but when it arrived, it was 1/2 inch. The device makes plenty of hot water, but being that it is 1/2 inch feeding a 3/4 inch hot water main line, there is a loss of pressure if I use hot water in more than one place. I deduct the one star for bad info from the company rep, other than that I am happy with it.
July 6, 2016
I ordered the ir8000 product works great. We had a small leak, the mfg supergreen contacted me immediately and I was able to drop it off the next day and was issued a refund. Amazon shipped a new one the following day and we were back up and running with hot water. From what I've read these are very reliable and supergreen clearly stands behind their product and made sure I was happy.
August 25, 2016
Was a little skeptical at first . a flow heater is a different creature than a tank but after a few lessons on how to get hot water I had to turn the beast down ! If it lasts with out service problems this will be the best buy of the year on Amazon . congrats to the designer
September 4, 2016

Let’s find out right away what we can expect from the features:

Features:

  • Uses Quartz element to heat up your water in a matter of seconds
  • Low Flow range of about 0.5 to 1.2 GPM
  • Safe mode recovery for instant diagnosis and recovery to ensure constant hot water flow
  • Uses coil less technology to ensure zero corrosion
  • Constructed with recycled materials

Conclusion

You’ve heard the advice a million and one times by now, you get what you paid for. But does this mean that the SioGreen Quartz Elements IR245 POU Infrared Elec Tankless H2o Heater is a cheap piece of plastic? On the contrary, the manufacturer really did a good job to make the IR245 worth more than its price.

The simple fact that this heater requires practically no maintenance makes it even more attractive in our books. We also couldn’t leave without pointing out that while the SioGreen IR245 POU Electric heater has been touted as mid-sized, it can only manage a maximum GPM of 1.2. So you can forget about simultaneous multiple applications.

 

PROS:
  • SioGreen’s patented Quartz elements make it possible to heat water from 0 to 105 degrees in just a couple seconds.
  • IR245s PID governed units translate to zero lost energy and up to 60 percent power savings.
  • Unlike conventional, tanked heaters, the SioGreen Quartz Elements IR245 POU Infrared Elec Tankless H2o Heater does not incorporate any sort of corrosive components.
  • Since the unit eliminates the risk of Calcium or Lime deposit formation, the IR245 is perfect for areas with hard water or well water
  • Absolutely zero venting required, so she’s safe for indoor use.

CONS:
  • The lower GPM of 1.2 makes it almost impossible to use two hot water applications at the same period of time.
  • Some customers have complained that their SioGreen IR245 POU units have minor leaks. These might just be individual defects or damages that occurred during shipping.
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Rheem 9.5 GPM Indoor RTGH-95DVLN Tankless Natural Heater

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water HeaterFor those of our readers who do not know a thing about Rheem, let’s just say you should be feeling quite ashamed of yourself. Everyone precisely knows who Rheem is.

Are you interested in knowing more?

When it comes to reliability and quality Rheem is globally renowned for exceeding the rigorous industry standards for cooling and heating products. Today, we’re going to be checking out their latest release in the form of the Rheem 9.5 GPM Indoor RTGH-95DVLN Tankless Natural Heater.

  • Product
  • Specification

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

All Rheem heating, cooling and water heater heating products meet and exceed rigorous industry standards for quality and reliability. From raw material delivery to finished product assembly, each ...

Available: In stock
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Part Number

RTGH-95DVLN

Item Weight

79 pounds

Product Dimensions

18.5 x 9.8 x 27.5 inches

Origin

China

California residents

Click here for Proposition 65 warning

Item model number

RTGH-95DVLN

Item Package Quantity

1

Special Features

Self-diagnostic system for easy installation and service, Digital display shows temperature setting and maintenance codes, Two-pipe direct vent system designed for PVC pipe, see instructions for details, Built-in electric blower, Exclusive! Guardian overheat film wrap (OFW), EZ-Link cable available for higher demand applications to connect two tankless units to operate as one, Manifold up to six units with an optional, Manifold up to 20 units with the optional MIC-185 plus the MICS-180 manifold control assembly, High-altitude capability - up to 9,840 ft. elevation above sea level, Digital remote control and 10 ft. of thermostat wire included, Supplied with a 120 volt power cord (indoor models only), Freeze protection to -30°F

Batteries Included?

No

Batteries Required?

No

RTGH-95DVLNThe unit was self-installed last week and it has been working like a charm. The unit is quiet, quick to deliver hot water, and I see no perceivable difference in flow-rate from old water heater to this new tankless unit.As far as installation specifics, it took a full 5 hours to remove the water heater and plumb in the new tankless unit. A lot of that time was spent re-plumbing the water lines, switching from the standard top input and outputs on the water heater to the bottom connections on the tankless unit. Additionally some time was spent on the gas line, removing the ¾"x½"x½" tee [input, W/H, Furnace] and replacing it with a ¾" sediment-trap connected to a ¾"x¾"x½" tee, since the tankless requires a ¾" feed and can use 199,000 BTU/H. [Note: I called local gas supplier and verified my meter supported 350,000 BTU/H, so no change was needed.] Other connections were more trivial in my garage installation, as the it was mounted on a wall where the vent pipes could go directly out through the wall. [One note on product deliver; the first unit was delivered by FedEx all beat-up and damaged and was not accepted. The replacement from Amazon came via UPS and the package arrived as one would expect.]One of the things that made the installation go a lot easier for me was the purchase of the RTG20220 valve kit including hot water pressure relief valve. This is a smart assembly of shut-offs, drain valves and screw-on connectors (plus a pressure relief valve for the hot). In my opinion, there would be very little savings purchasing these components all separately and if separate, there would be more connections and more of a chance of leaks.As far as the input and exhaust goes, the brochures touts the 3" PVC connections as a benefit, however locating any PVC over 2" at the local hardware stores is problematic. However, the installation manual mentions that ABS, Schedule 80, or galvanize steel can also be used. I ended up using a bushing reducer to 2" PVC as I only need to travel less than a foot out through the wall. I purchased the Rheem SP20285 Vent Termination Kit, and after painting it to match the house, it looks very clean.Operationally, the unit couldn't be simpler to use. There is a remote control panel used to set the output water temperature and subsequently could possibly display fault codes. The default water temp is 110degF, but up and down arrow buttons makes bumping the temp to 120degF just a few clicks away. As an aside, the need for having this remote panel is at a loss to me. Once initially set I can't imagine going back and tweaking the temp and should a failure occur, seeing a code 10ft from the unit or on the unit would make little difference. At least in my installation I would have rather had this extra contraption just built directly into the cabinet front. That would work just as well.As far as operations, the unit kicks on the instant the hot water flow rate is over 0.40 gpm. Initially the internal fan kicks on and can be heard in the adjacent room, though not loudly. However, once the unit has got fully fired up and is delivering hot water, the fan shuts off and the unit is ultra-quiet. Even standing next to it, it is hard to hear that it is still on and delivering hot water. Actually, the old water heater made more noise with its banging and popping noises during water heating, though that could be a model specific issue. The old W/H was void of sediment and fed by a water softener but it still made a racket while the burner was on.A strange behavioral side-effect of owning this new unit is that initially now when rinsing a single dish or other times when one would not normally wait for hot-water, I now only turn on the cold or leave the mixture handle on cold knowing that I am using energy for no reason. Knowing the unit is turning on to deliver hot water that will never make to the faucet in the back of the house seem wasteful, albeit the same thing was happening with the old water heater but I never thought about it before.It will be several months, if not a year, before I am able to really quantify the long term cost benefits of tank vs tankless. The old tank of mine was rated at 240therms/year, this new one at 159. 80 therms/year at $1.20/therm makes for a long payback period. However, I don't think the cost of keeping the standing water hot is factored into the W/H sticker, just the efficiency to heat a specific volume [.62 vs this unit's .94]. Anyway, maybe I'll update this in a year with my real world factors, assuming other gas uses for heating remain fairly constant. Also, if this unit lasts 20 years versus more than one W/H in that same period would also make a difference. Bottom line is that overall I would recommend this unit and if one is marginally savvy at plumbing (gas & water), installing the unit yourself is quite feasible.
March 19, 2013
I decided to go with the model 95 since I have four bathrooms in my house. Only two might be used at one time and washing clothes, so I will have enough hot water supply for three continous uses. Its a bit pricy, but worth the investment. I had this tankless water heater for two months now. Its performed up to my expectations. Flow is great. I especially like the temperature control. You can mount the LED temperature control panel anywhere (and add more wire if you want to remotely install it), press the up and down buttons to change the water temperature on the fly. The water does take about 20 more seconds or so to get hot water at your tap, but its worth the wait when you are taking long showers or washing cloths at the same time and never run out of hot water! There is a water save feature that you can set so that the flow is reduced and then increased once hot water is achieved. Nice for water conservation areas or if you want to save on your water bill. I would not go with any other product after using this Rheem unit. The quality of manufacturing the unit is second to none. Installation was not that bad at all. If you are going to do it yourself, make sure you read the instructions and take your time. It took me and another plumber about 6 hours to install from start to finish. Thats removing the old tank hot water heater and making the necessary plumbing changes of copper pipe. I would highly recommend getting the cut off valves with the hose draining capability. This will save you alot of time when you have to drain either/both the HOT and COLD lines of the unit for maintenance. You just hook up a hose to the valves, turn off the main supply and open the valve to let the water run out to a suitable drain. The name of the part is: Rheem RTG20220AB Webstone Tankless Water Heater Service Valve Kit, Clean Brass. This is especially good when servicing the water filter too. So far, Im very happy with this unit. Its quiet and runs very efficient. Good Job Rheem!
September 10, 2016
It is early - has been installed less than a week but very pleased.First, item shipped and arrived within a few days. The item was double boxed - the manufacturer's box was inside another box with foam padding on all sides. Care was taken to insure the item arrived undamaged - and it did arrive in pristine condition. Awesome!I had a local plumber install for $750 and it took them just under 4 hours to install, test, and clean up.This unit is quiet. It is quieter than the previous power vented, gas, 105 gal water heater that was replaced. I literally have to go into the utility room to hear the exhaust fan running.As I expected, it takes a minute or so for the hot water to arrive to the shower but I expected that and it isn't much different from the experience when I had the tank.Current ambient water temp is about 68 degrees so it will be interesting to see how the unit responds when water temps are in the low 50s.The max setting is 120 degrees from the factory. I did order the computer chip that will allow temp adjustments up to 185 degrees.I will be interested in seeing the long term operational effectiveness of this unit, reliability, maintenance, etc. But, my initial response is very pleased.
October 9, 2016

Want to see how the heater works? Then let’s get this show on the road – the top features include:

Features:

  • Constructed with stainless steel condensing heat exchanger for peak energy efficiency.
  • Incorporates a whole bunch of intelligent controls all designed to enhance safety and performance.
  • Listed by AHRI as a third party efficiency unit.
  • Requires up to 199,000 BTUs
  • Self-diagnostic system for easier service.
  • Low Nox system.
  • Digital display for quick temperature reading.

Conclusion

Running a quick survey here – so pop your hands up if you fit the bill. Do you live in harsh winter climates where hot water is more than a bare necessity? Or maybe you reside in a pretty large house where hot water is always being used for one task or the other.

Either way, we’ve found exactly what you’re looking for. 

Offering high-powered performance, an incredibly high flow rate of about 9.5 GPM and an even higher price range, the Rheem 9.5 GPM Indoor RTGH-95DVLN Tankless Natural Heater is built just for you. The insanely high rate is more than enough for those of us with homes that house anywhere between 2 to 4 bathrooms.

A word of caution, however – the Rheem heater will need complicated venting systems to ensure there are no events of fume build up.

 

PROS:
  • Since the RTGH-95DVLN 9.5 Indoor Water Heater incorporates their exclusive Low Nox system, we can literally install the heater anywhere we want.
  • Remarkably high flow rate (9.5) GPM that can serve up to 4 bathrooms simultaneously without dipping.
  • The unit is quite energy efficient with a 94 % energy rating even at 199,000 BTU.
  • For us convenience lovers, we can look forward to the Rheem-provided remote to control the unit from afar.

CONS:
  • There’s really no other way to put it; Rheem has really set a very high price tag for the RTGH-95DVLN.
  • For a unit that can hit a max flow rate at 9.5 GPM, it really disappoints with a min rate of 0.26 GPM.
  • Can only use natural gas.

Rheem 9.5 GPM Indoor RTGH-95DVLN Tankless Natural Heater

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Rinnai V65EP 6.6 GPM Outdoor Low NOx Tankless Propane Water Heater

Rinnai V65EP 6.6 GPM OutdoorYou know what we’re tired of?

It’s those incredibly complex, high-tech water heaters that are as easy to operate as a fighter jet. But with today’s highly evolved, tech packed heaters, it can be a tad difficult to find on that is super easy and straightforward to use.

There is some good news though; one brand has really made its mark to impress those of us who are technologically challenged. If you’re in the market for a water tankless heater that will just get the job done plain and simple, then check out the Rinnai V65EP 6.6 GPM Outdoor Low NOx Tankless Propane Water Heater. In addition to making your work much easier, the heater boasts of a generous 6.6 gallons of hot water per minute.

  • Product
  • Specification

Rinnai V65EP 6.6 GPM Outdoor Low NOx Tankless Propane Water Heater

Rinnai's V65E exterior-mount tankless water heater efficiently delivers up to 6.6-Gallon per minute (GPM) of hot water, making it perfect for your one to two and half bathroom home. This ...

Available: In stock
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Part Number

V65EP

Item Weight

47.4 pounds

Product Dimensions

9 x 14 x 23 inches

Origin

Japan

California residents

Click here for Proposition 65 warning

Item model number

V65EP

Size

Large

Color

White

Finish

White

Item Package Quantity

1

Special Features

Certified for Installation in Manufactured (Mobile) Homes, Pre-set at 120°F (adjustable to 140° by installer), Energy Factor of .82 for Both Gas Types, Integrated Error Code Indicator, Compatible with Full Line of Rinnai Digital Controllers, Temperature Range with Controllers: 98°F - 140°F, 10-Year Warranty on Heat Exchanger, 5 Year Parts, 1 Year Labor

Batteries Required?

No

Bought this as a direct replacement for an old MYSON 35. Installing it myself was amazingly simple. I mounted it to the wall, connected the water and gas lines (labeled all the lines before removing the old unit) left the 120V wiring to the professionals. When the plumber arrived, he checked and verified all my work as correct and without leaks, completed the electrical wiring and fired it up. Installing it to the point on electrical wiring and firing it saved me a good amount of monies in professional labor. If you have basic handyman skills, installing it as far as I did is a snap. Fired up great and have been enjoying endless hot water ever since. Now what you've been reading for: As a general reference, with the bathroom sink about 30 feet away it will flush out the cold water and produce hot in about one minute. Shower head volume will give hot water in 30 seconds. I have had two rain shower heads running without a problem. Great unit, very satisfied.
March 14, 2013
This baby rocks.First, I bought the indoor water heater of the same model, but returned it since we opted to put the water heater outside, on the back of the family room. I read the wiring diagram but called Rinnai just to be sure about the low-voltage control terminals. Very good folks. I couldn't believe how small this unit was. I worked with a lot of heat exchangers in my life, and it's amazing all this could be accomplished in such a small unit. But the hardware, the gas lines, waterlines, solid-state circuitry, and adjusting simplicity for heat, altitude, etc.; really looked impressive. (And since it's in a new location, my son and I ran all of the water, propane, and new electrical to the unit. Safety and pressure tests looked really good.) Fired this baby up, and was stunned by it's efficiency and volume. I did have to throw DIP switch 6 in the first group however to go from 120 to 140F. (And there's another controller available for an additional cost to go all the way up to 160F, which we don't need.) I live in beautiful Grants Pass Oregon, with lots of acreage, and have a fantastic artesian well that delivers quite a bit of water. My son came over and was taking a shower in the middle bathroom the same time as my wife in our master's. My well pump was maxed since the washer was running as well. But there was NO DEFICIENCY of very hot water at any location.I'm very satisfied.Bob R.
March 27, 2017
Fantastic !!! We replaced an EZ Tankless water heater with this one, what a complete world of difference between the two of them. Rinnai is so much more efficient and works perfect. No more scalding hot or ice cold showers. I love the remote thermostat so you can adjust the temperature, so no worries if little ones are going to pour a bath that is too hot. I can not say enough good about this product.We purchased this along with a value set for easy cleaning and maintenance, I suggest that you think about putting a inline prefilter system to maximize the life of the heater.
May 25, 2016

What to know more about the V65EP? Here are some of the top features we liked:

Features:

  • Whole house unit – services entire homes from just one box
  • The unit delivers 6.6 gallons of hot water every minute.
  • Power peaks at 150,000 BTUs
  • Has an Energy Factor of about .82 for Natural Gas or Propane.
  • Certified for Installation in Mobile Homes
  • Enhanced scale detection for damage control.
  • Temperature lock to prevent accidental and unauthorized changes to water temperature.
  • Compliant with South Coast Air Quality Management District NOx emission levels.

Conclusion

As promised, the Rinnai Water Heater promises a user-friendly interface with easy controls. This means that we do not have to suffer those fancy controls or those equally undecipherable instruction manuals. Since this exterior mount water heater delivers a neat flow rate of max 6.6 GPM of water, making it the ideal appliance for your one or two bedroom house. The Rinnai V65EP 6.6 GPM Outdoor Low NOx Tankless Propane Water Heater is easy to install, compact and even easier to operate.

What more could you want in your water heater?

Throw in the preset temperature function as temp lock and we’re sold.

 

PROS:
  • Efficient, practical unit that adequately supplies the whole house with hot water.
  • Comes in either the affordable natural gas model or the high-performance propane.
  • Extremely easy to install and operate.
  • Incorporates temperature lock to prevent any unforeseen accidents or unauthorized temp changes.
  • Fully compliant with South Coast Air Quality NOx emission levels.

CONS:
  • The medium flow rate makes it unsuitable for larger homes with more than 2 bedrooms.
  • Cannot be mounted indoors; has to be installed outside.
  • While the 6.6 GPM flow rate is steady in warmer climates, people in colder areas might have to contend with a lower rate of 4 GPM.
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Takagi Outdoor T-KJr2-OS-NG Tankless Water Heater

Takagi T-KJr2-OS-NG You know what really gets us excited?

 It’s when a manufacturer is able to combine a spectacular piece of equipment with a price range that is not too hostile to our customers. Takagi definitely nailed this concept with their latest release in the form of the Takagi Outdoor T-KJr2-OS-NG Tankless Water Heater.

This is just one of the reasons why users worldwide highly recommend this model for both smaller and midsized homes. Similarly, the T-KJr2-OS-NG is by far the smallest unit in the Takagi line-up. But does the smaller size mean less performance?

  • Product
  • Specification

Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater, Natural Gas

T-KJR2-OSNG Features: -Tankless water heater.-Natural gas.-Can be converted into a direct-vent unit.-Outdoor installation only.-BTU/hr: 19,500 140,000.-0.82 Energy factor.-Flow rate: 6.6 GPM ...

Available: In stock
Buy this item
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Part Number

T-KJr2-OS-NG

Item Weight

37.4 pounds

Product Dimensions

6.7 x 13.8 x 20.5 inches

Origin

China

California residents

Click here for Proposition 65 warning

Item model number

T-KJr2-OS-NG

Size

-1

Color

N/A

Finish

N/A

Item Package Quantity

1

Certification

Energy Star

Usage

Designed for outdoor use with natural gas

Batteries Included?

No

Batteries Required?

No

Warranty Description

Residential: 12 year heat exchanger, 5 year parts and 1 year labor. Note: Water heaters of any type must be installed by licensed personnel or warranty will be void.

Bought this to replace the water heater that came with my house and installed who knows when?Having owned my home for 15 years, it was time to replace the water heater since only one of us could take a mostly hot shower while the other got a luke warm one. Bathing 3 dogs and then trying to clean myself after was never fun.I researched tankless water heaters and came up with 2 choices, Noritz & Takagi (avoid Bosch). I looked around @ local plumbing supply stores and found that Amazon was $75 cheaper even with a contractor discount so I ordered up this bad boy and have been enjoying it ever since.Comes with a wired remote control so that you can alter its base temperature or monitor the gallons per minute. This is really handy for times when you want REALLY HOT water like when doing laundry...just crank up the temp to 160 and clothes get extra clean.Want to fill up the tub after a long day...check.
May 21, 2014
This heater increases output temperature by internally restricting water flow rather than increasing gas flow. With the heater off, I can pump 4.5 gallons per minute through it. As soon as the heater turns on, this decreases all the way down to 1.6 gallons per minute when it's set on maximum temperature. If your input water temperature is very low you may find the flow rate too small to support your needs.Here are some specific temperatures and flow rates:57 degree water in temp., 122 degree outlet temp., 2.1 gallon per minute flow rateIncreasing the outlet temperature to 140 degrees decreases the flow rate to 1.6 gallons per minute.74 degree inlet water temp, 122 outlet temp., 2.4 gallons per minute flow rate.74 degree inlet temp., 131 degree outlet, 2.1 gallons per minute flow rate.After 24 hours of actual heating use, the blower began emitting a loud "whirring" sound. The unit still heats but is uncomfortably loud. When I first started using it the heater was almost completely silent.
March 1, 2017
We had the original Takagi T-KJr for 10 years. Except for yearly flushing, no other maintenance required. Then it started acting up. At times we may have hot water, but mostly not. Local plumbers had no idea how to fix it. So it had to be replaced. For the 10 years of service, it deserved a 5 stars rating.However, the new one had same physical dimension, but the locations of the inlets and outlets varied slightly, which required re-plumbing (which could be quite expensive, unless you can do the job yourself). Hence we removed 1 star from the rating.
December 19, 2016

Let’s dig a little deeper:

Features:

  • Engineered for outdoor installation only.
  • Incorporates internal freeze protection to safeguard against colder climates.
  • Boasts of a power rating of between 19,500 to 140,000 BTU per hour.
  • Energy factor of .82
  • Generous max flow rate of 6.6 gallons of pure hot water per minute.
  • Overall dimensions of the unit are as follows – 20.5″ H x 13.8″ W x 6.7″ D at 37.4 pounds.

Conclusion

We know what you’re thinking about.

Don’t be fooled by the mini size of the model. While the T-KJr2-OS-NG Tankless Water Heater is the smallest unit from Takagi, it scores pretty high when it comes to technology. In addition to being able to provide 6.6 gallons of hot water per minute, the unit also features an air-fuel ratio sense that checks the efficiency. This means that we get fewer emission levels and help conserve the environment.

The small unit also has temperature safety controls and will shut itself down in the case of overheating. Combine the compact size, incredible performance, and affordable price, and we have here a tankless heater worth taking home.

 

PROS:
  • Superior construction that will last your family for over ten years.
  • Easy installation as indicated in the instructions.
  • Very affordable and cost effective even while in operation.
  • Can be converted into a direct-vent unit.
  • A leader in safety features such as freeze protection, surge protection as well as troubleshooting.

CONS:
  • Outdoor installation costs tend to run high, especially when you factor in the direct vent system.
  • The T-KJr2-OS-NG Heater cannot fulfill the needs of larger homes or commercial needs.
  • Loose connections may result in a serious gas leak, so call in the professionals.
  • Some customers have complained that their units become louder with time.

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Eccotemp High Capacity FVI-12-NG Gas Tankless Heater

Eccotemp FVI-12-NG If you thought that we were done with cheap and affordable tankless water heaters, then you’re dead wrong.

Look, I’ll be totally honest with you.

There’s a reason why the FVI-12-NG High cap Gas Tankless Heater from Eccotemp comes with a low price tag. No, it’s not because of a low GPM or anything like that. It’s because the FVI-12-NG has been reconditioned. Simply put, this means that your Eccotemp is either a return or it might have been a tad scratched or dented during shipping. Still, the units are designed to work as if they were brand new and even come with a warranty.

  • Product
  • Specification

Eccotemp FVI-12-NG High Capacity Gas Tankless Water Heater

The Re-Conditioned Eccotemp FVI12-NG Tankless Water Heater is like new and may contain light scratches or dents to the external case. Many of these Re-Conditioned FVI12-NG  Tankless Water Heaters ...

Available: In stock
Buy this item
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Part Number

FVI-12-NG

Item Weight

33 pounds

Product Dimensions

4 x 15 x 24 inches

Origin

China

California residents

Click here for Proposition 65 warning

Item model number

FVI-12-NG

Color

White

Power Source

gas-powered

Voltage

110 volts

Wattage

4 watts

Item Package Quantity

1

Certification

UL

Batteries Included?

No

Batteries Required?

No

Warranty Description

2 Year Warranty Heater

This water heater has great high end features of far more expensive versions. It is very well made and once the knobs are set for your particular needs, it works consistently.The 'water temperature' adjustment knob could use a better description. From tinkering with it, I concluded the 'water temperature' knob is really a flow rate adjuster. A higher 'water temperature' setting, makes the water heater turn on at lower flow rates (lower demand) but also limits the flow capacity. It seems to behave like a restricter, that increases the flow velocity which then triggers the heater to turn on, but like a restrictor, it also limits the maximum water flow rate.Turn the 'water temp' to a much lower setting and the heater flows a lot more hot water but also needs more water 'demand' (two small faucets together will do it) to trigger the heater to turn on.The gas knob simply adjusts the size of the flame. So with lower water flows (higher 'water temperature' knob setting) you will want a smaller flame to keep the heater from shutting off due to overheating from the lower water flow.So to clarify:A Higher 'water temperature' knob setting = more 'turn on' sensitivity but a lower maximum water flow rate.A Lower 'water temperature' knob setting = less 'turn on' sensitivity but a higher maximum water flow rate.Once you set the right 'sensitivity to flow' for your needs, then simply set the gas knob to a good water temp. I would err on the cooler side (lower gas knob setting) to keep the heater from over heating and shutting off. But if you have higher water flow setting (lower 'water temperature' knob position) the gas can be set a little higher. In order to warm the increased water flow.I hope this helps someone who was not considering this heater. It really works great, it simply needs a little patience to be set to your speciific water heat and flow needs.
January 7, 2015
I do like the unit but it took a lot of work to retro fit to my old house. Not the units fault, just the one of those things that you deal with in old homes.Mounting it on the wall and venting it through the wall is pretty straight forward. If your venting it through the side wall, as I did, you do not need to buy additional pipe or fittings, everything you need is included. You will need high temp silicone sealer to seal the exterior wall plate to wall and the exhaust pipe passing through it to keep the exhaust gas from getting back into the house. When you get to plumbing the water lines, you do need to purchase the service valves, they are not included. If you live in an area that requires a back flow preventer check valve you will have to purchase that as well. For plumbing the gas, you need to purchase a gas shut off valve, a section of flex gas line and the appropriate piping/fittings for your needs. Use white or pink thread tape for your brass water fittings and yellow gas tape or pipe dope for your gas fittings. Your gas connections have to seal perfect! Really really really close is not good enough, they have to seal perfectly. Check them multiple times if your going to install it yourself.After I installed our unit I found that it worked with our two handled faucets but not the one handled models. So I had to change everything to the two handled style faucets. That's not a huge deal at the sinks, but our bath tub faucet was a single handle style and switching that out meant ripping out and changing the tub surround as well....that was a big deal.After all that, the hot water was still hit & miss. So I had to chase pressure and flow issues. Bought a water pressure guage at Lowes and my home tetsed at 60psi, right were it should to be. Pressure is good, how is my flow? Just stuck a quart jar under each faucet, turned on the hot water, timed it and did the math. I had 1.3gpm flow, right on the line of being enough for the unit and not being enough. I had old nasty galvanized pipe in my home so I replaced all the "hot" lines and retested. It brought it up to 1.8gpm. Now the hot water works every time without fail.So with new pipes and new faucets the most flow I could get is just under 2gpm. I think the flow is limited by the 1/2 piping in the unit itself...not sure how they came up with such a high 3.4gpm advertised flow rate. I tried unplugging the machine and timing the water flow, no difference. But it does work, i just add a little cold to boost the shower pressure back up.I plugged the unit into a kill-a-watt meter to compare electrical specs. They advertise a 2 watt draw at idle, I recorded 1.7 watts at idle. They advertise a 10 watt draw while running, I recorded a settled rate of 24.2 watts while running, once the water was up to temp. Good or bad...at least you know.The unit does not qualify for any government tax credit. I contacted eccotemp and was told they do not participate in the energy star program. The unit was not on the list of qualifying units for rebates with my gas company either. I suspect thats because of the energy star issue as well. I'm not complaining though, they offset that with a great price point. It has been a solid running efficiant unit, I'm just sharing what I have found so you can be a wise consumer.I cant speak of gas savings at this point as we are heading into winter and my furnace is on as well. I will try to update in the summer when the furnace is off. During the summer the only thing using gas will be this water heater.
November 24, 2012
The price was lowest compared to other brands.As others have said, it requires apx 1.5 gpm to start working, there are adjustments inside the unit to modify the diaphragm & micro-switch to start the unit with less GPM's going thru it. I modified the settings and micro switch sensitivity but will keep it functional as the present setup is a safety concern and it has a pretty fool proof logic.. simple. Next is to set all of the fawcetts to flow about the same which are on the water line so the unit can detect flow and all of the fawcetts have the same or desired heat..shower is my main concern with a low flow head.. (be cautious of the low flow, it may not trigger the unit to start) the unit is user set as to heat vs flow, it is not an automatic proportional design so some trial and error is involved. With that done, looking at the system it works very well once set, occasionally i have to turn off the fawcett and re open it if somehow it did not fire up, minor inconvenience. I think the 600 buck + units may start at a lower flowrate and proportionally regulate the heat vs flowrate to the set temp .. this is better when there are more fawcetts and when they are used at the same time thus avoiding the cold momentarily shower or when the flowrate is changed threw the Ecotemp just before it cuts off or is exceeded to heat vs flow, it gets hotter or cooler depending on load, this is good and bad .. if i want a bit more heat i cut back the flow and hope i am just before cut off sometimes it just right sometimes i get cold at the end.. So i do not know whether to rate this a 0 or 5.. If i had known this i would have gotten the 600 + buck unit but im happy enough with the Ecotemp knowing i can modify the guts for other applications if i need to and the price was a good deal.
April 28, 2014

Want to find out more about the reconditioned units? Of course, you do.

Features:

  • The unit works similar to natural gas fired, forced vents.
  • Has a flow rate – 3.4 gallons per minute and requires 75,000 BTUs.
  • Comes with a horizontal steel venting kit that is ready to install.
  • 110 volt UL power cord for powering the digital display and internal exhaust.
  • Incorporates a pressure activated electronic ignition.
  • Internal sensors and live burners.

 

Conclusion

Are you ready for the best part?

Just by looking at the size and flow rate, you can tell that the FVI-12-NG High cap Gas Tankless Heater is built for small or medium water production. While the company may try to sell it as ideal for those of us who need one or two water applications, we’re not sure how practical this will be if someone starts taking a shower.

However, we’ll be the first to admit that the unit will feel right at home in smaller cottages, bungalows, apartments and vacation cabins. It’s all a matter of deciding whether the small scratches and minor dents will put you off or not.

 

PROS:
  • Highly affordable unit that is also easy on the pocket after installation.
  • Extremely energy efficient and eco-friendly.
  • Small and flexible enough to install in even the tiniest of spaces.
  • Comes with a full warranty just like a brand new model.
  • Sleek, modern and attractive design that is easy on the eyes.

CONS:
  • Not as sufficient for larger houses or commercial use.
  • Since the units are reconditioned, you should expect some minor surface scratches as well as dents.
  • Will require you to install the included venting system to the outside.
  • While the warranty is the same as a brand new unit, it is actually not a lifetime warranty.

Eccotemp High Capacity FVI-12-NG Gas Tankless Heater

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Rheem 6.4 GPM RTG-64XLN Low NOx Natural Gas Water Heater

Rheem RTG-64XLN 6.4 GPMSeriously, how do you cope with keeping a full tank of water constantly heated?

In addition to being highly inefficient and impractical, tanked heaters consume an unbelievably high amount of electricity. This is why you need a tankless heater for water that will not only save you time but also save your hard earned money.
Now that we’ve shown you all the ill effects of tanked heaters, let’s move on, shall we?

If you’re thinking of ditching your power guzzling heaters and settling for something cheaper, you probably want to go with a natural gas tankless heater. Not only are these more resilient and stronger, but they won’t be such a long stretch from what you’re used to. If we’re talking about natural gas, then the Rheem 6.4 GPM RTG-64XLN Low NOx Water Heater deserves a solid mention.

  • Product
  • Specification

Rheem RTG-64XLN 6.4 GPM Low NOx Outdoor Tankless Natural Gas Water heater

Rheem RTG-64XLN Outdoor Natural Gas Tankless Water Heater Residential Tankless Water Heaters - Rheem tankless gas water heaters offer you the perfect solution to heat your water at home. Imagine ...

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Part Number

RTG-64XLN

Item Weight

54 pounds

Product Dimensions

14 x 10 x 26 inches

Origin

USA

California residents

Click here for Proposition 65 warning

Item model number

RTG-64XLN

Size

Mid-Efficiancy 64 Outdoor

Color

Grey, Gray

Style

Medium-Efficiency Tankless Outdoor Water Heater

Shape

Rectangular

Power Source

120V AC, plug or Hard-Wired

Voltage

120 volts

Installation Method

Outdoor, wall-mounted

Item Package Quantity

1

Flow Rate

6.4 GPM

Extension Length

120V Plug not included with Outdoor models, Must be Hard-Wired!

Special Features

.82 EF with all copper heat exchanger, Industry First! 0.26 GPM minimum flow rate, 0.40 GPM minimum activation flow rate, Exclusive! Overheat film wrap (OFW) to protect the heat exchanger, Environmentally friendly Ultra Low NOx burner meets SCAQMD rule 1146.2 requirements, High-altitude capability - up to 9,840 ft. elevation above sea level

Usage

Outdoor Use ONLY

Included Components

Digital Remote Control, 10 ft. Thermostat Wire, Manual Gas Isolation Valve

Batteries Included?

No

Batteries Required?

No

I purchased this tankless after purchasing the eccotemp (don't waste your time on that). This is a wonderful heater. Remote is included as well, so you can adjust the temperature and even power down the unit from a distant location (must use a thermostat wire, 18/2).What's so great about this? It keeps the water temperature at the desired temperature (up to 160, I think). No problem with flow etc. It heats up VERY quickly, so there is little wasted water. I am using it for an outdoor shower, where we already had a gas hookup for an old hot tub. Installation was quick and wiring was easy.Warranty is 5 years parts and labor, 12 years heat exchanger, which is one of the best. Efficiency is at 84%. Now tankless heaters can have efficiency up to almost 100% (condensing heaters, they're called) so if you are using this to heat a lot of water, then calculate a 15% savings in gas for a better heater into your equation. But for a small house or an outdoor shower, the price here is hard to beat. And the quality is superb.Great buy.
May 5, 2014
I got this dude to replace a 50 gal massive water heater that is minutes away from dumping 3 oceans of water on my new hardwood floors (or so my wife thinks). I didn't want to deal with installing the crazy expensive vent pipes through my attic and roof so I decided to put it outside. I chose a spot right next to the bathroom since one common complaint is the time it takes to get the hot water to the faucet with these tankless heaters. After getting all the water lines moved, gas hooked up, and electrical ran to the unit I cranked the thermostat to 120 and jumped in the shower. I was met with glorious hot water...for 30 seconds then succumbed to the icey frigid water sent from the depths of the Arctic. Frustrated and cold since it was around 35 degrees outside, I dry off and go outside to see what the heck is happening. Long story short, I had put a Rubbermaid cabinet around the unit and up against my house to block the unit from the Colorado mountain elements and keep the pipes from freezing. When the heater turns on it puts out a fair amount of exhaust which filled the cabinet, leaving no oxygen to the flame which turned the burner off and left me frozen and alone. I took the cabinet doors off leaving the sides, roof, and floor to keep the rain/snow/wind off of it best I could and now it works like a dream. Would highly recommend. Super simple to set up as long as you give it enough vent space.
April 15, 2014
This product is excellent, works very well for my 2 bathroom house. I bought it to replace my 10 year old Takagi T-K1S. I made my own measurement and this Rheem model requires about 0.54gpm to startup. With the Takagi it takes about 0.96gpm. This is just my own way which is not very accurate though. Just a ballpark idea. I love this product cause it takes less time to get the hot water out of my faucet. The cold water sandwich is very minimal. I have used it for 20 days now.
May 11, 2016

Are you ready for the top features? You better be!

Features:

  • The Rheem RTG-64XLN offers a 6.4 gallons per minute flow rate – more than enough for multiple simultaneous showers.
  • Has an energy rating of .82 with requirements of 150,000 BTUs.
  • Incorporates Low NOx functions.
  • Includes 10 feet of thermostat wire.

Conclusion

Here at the review haven, we’re always looking out for our customer’s pockets and how we can help you save money. However, there are times when you do get what you pay for. So if you want something high quality and with a decent GPM, you’ll have to shell out some big bucks.

The Rheem 6.4 GPM RTG-64XLN Low NOx Water Heater not only comes with a generous 6.4 GPM flowing rate, but it also incorporates a ton of eco-friendly features to boot. So if you do have a few hundred bucks to spare, then this model will pay for itself in the long run.

 

PROS:
  • Helps us to conserve the environment with its Low NOx that cuts back on harmful emissions.
  • The higher flow rate can be able to serve multiple bathrooms or kitchens simultaneously.
  • Comes with extra frills such as a remote controller and thermostat wires.

CONS:
  • While the flow rate is consistent at 6.4 GPM, areas with cooler climates may only get a fraction of that GPM.
  • Should only be installed outdoors under all circumstances.

How We Tested

By this point, I’m sure you’re wondering who the quack we are and why we qualify to tell you a thing about these tankless heaters. Well, all you really need to know is that our team was reviewing tank-less water heaters when your folks were still talking about tanked heaters. Suffice it to say; we know our stuff.

However, we go to great lengths to ensure that all our products are tested and retested to make sure that they do what it says on the box. If anything is amiss, off place or just in the slightest funny looking, our team of reviewers will be all over it like white on rice.

Product Name Flow Capacity Overall Rating Details
Marey Power Gas 10L Digital Panel Tank-less Water Heater 3.1 GPM 8 Check price
Rinnai Natural Tankless Water Heater RL75iN 7.5 GPM 10 Check price
Eccotemp High-Capacity FVI-12-LP Propane Tankless Heater 3.6 GPM 8.5 Check price
SioGreen Quartz Elements IR245 POU Infrared Elec Tankless H2o Heater 1.2 GPM 8 Check price
Rheem Indoor RTGH-95DVLN Tankless Natural Heater 9.5 GPM 9 Check price
Rinnai V65EP Outdoor Low NOx Tankless Propane Water Heater 6.6 GPM 9.5 Check price
Takagi Outdoor T-KJr2-OS-NG Tankless Water Heater 6.6 GPM 9 Check price
Eccotemp High Capacity FVI-12-NG Gas Tankless Heater 4 GPM 7 Check price
Rheem RTG-64XLN Low NOx Natural Gas Water Heater 6.4 GPM 9.5 Check price

In addition to carrying out our own tests under different climates, environments, altitudes and other factors, we also reach out to long-time consumers of these products. This way, we have an informed idea of what we can expect from our tankless water heaters in 10 years to come.

C’mon; you didn’t think we went to the future now, did you?

All Types of Tankless Hot Water Heaters

Check this out:

In the end, it’s all about getting the right tool for the right job. Before you shell out your hard earned money for a killer heater, it’s important to understand all the different types of tankless heaters out there.

When you hear the terms gas powered or electric, you should be able to see more than just a power source. Our extensive testing and retesting showed us that there are a whole lot of variables that need to be considered before you decide what type of heating system you’ll be installing.

Enough chit chat, we’ll have time for all that in the shopping guide below. But for now, I’m sure you want to see how each of the different types work right? Yeah, I thought so. And we’re going to start with Mother Nature at her very best.

  • Natural Gas Heater

Getting your natural gas might be simple, but the tankless heaters for water are a bit more complicated than that. In a tankless, natural gas powered heater, cold water is drawn directly into the unit where it proceeds through a quick heating process. Basically, the water is passed through a series of burners and heat exchangers where it is warmed to your desired temperatures.

Since natural gas-powered units are able to handle incredibly high volumes of water, they are more than ideal for large homes. They’re also quite familiar with most of us who live in freezing climates all year round. Now, naturally (pun intended), natural gas will always be cheaper than electricity.

So when it comes to both long-term utility perspective and saving money, a gas powered model might just be the best tankless hot water heater on the market.

But wait; A word of caution for all our esteemed visitors.

As always, every type of tankless water heater has its own limitations. For the gas powered units, the biggest drawback is always the upfront cost. This means that a gas powered model is more expensive than electric powered. Furthermore, the fact that these heaters emit fumes means that we’ll have to vent all the emissions outdoors.

Fortunately, most brands already anticipate this issue and take all the right steps to sort it out. If you’re buying a gas or propane powered tankless heater for water, then chances are that they will include a proper venting kit with the purchase. This way, all we have to do is install the venting system to exhaust fumes either from walls or through the ceiling. That’s definitely a small price to pay for efficient heating capabilities.

  • Propane Heaters

Propane powered heaters work pretty much the same way as natural gas-powered models. The cold water is drawn directly into the unit where it then proceeds through a quick heating process. The water is then passed through another series of burners and heat exchangers where it is warmed to your preset temperatures.

However, there are some differences when it comes to how methane and propane burn. These differences are the ones that affect factors like energy efficiency, cost, as well as longevity of the unit. Propane units seem to provide more power and as a result, they offer us some of the highest flow rates on the market.

Some of these models can even hit an impressive 9.5 GPM. However, propane gas is also infamous for its higher levels of emissions. As such, users will need even more ventilation. This means plenty of maintenance and cleaning as compared to the other types of tankless water heaters.

  • Electric Heaters

There’s no other way to put it; tankless electric heaters for water are by far the most affordable option. In addition to costing a lot less up front, they don’t require nearly as much maintenance as the other gas-powered models.

However, this does not mean that they skimp out on performance. When it comes to quality and performance, electric heaters can match their propane and natural gas counterparts pound for pound. However, they cannot possibly supply as much power as the other heavyweights.

But here’s the interesting thing.

Aside from the fact that they are cheap to purchase and require virtually no maintenance practices, the tankless electric power models are popular for other reasons. They are smaller and compact enough to install practically anywhere in your home. We’re talking under sinks, in closets, over shelves, or just next to the hot water applications.

However, their smaller size means that they are only suitable for smaller homes that have slightly lower intermittent water needs.

Heater for RV

When it comes to tankless heaters, even recreational vehicles have caught on. After all, you still need hot water in the kitchen and bathroom even while RVing across the countryside. However, you have to consider a couple of factors.

Since your RV has limited space, you obviously want something small and compact. Similarly, you also want to make sure that you get as much venting in there as you can. The fact that RVs are in constant motion helps make exhausting any fumes very easy. Since RVs are also limited when it comes to a power source, you will also have to go with a gas-powered model.

Rinnai Tankless Water Heaters

Allow me to shift your attention to something here real quick; if you’re new to the world of tankless H2O heaters, you’re going to want to go with the simplest, most recommended model.

We’re talking about:

In a world where tankless heaters are getting real complicated, Rinnai comes to the rescue. Much to the relief of many technologically challenged people, one brand has really made its mark to impress us.

If you’re in the market for a tankless heater that will just get the job done plain and simple, then check out the Rinnai tankless heaters for water that make work easier, faster and more efficient.

Maintenance

Riddle me this if you will; just exactly how much maintenance does a tankless heater for water need? And what on earth does their maintenance include? Don’t worry; we’ll share all this information to help you maintain your unit and get the most out of her.

Basically, tankless heater maintenance entails flushing the unit at least once a year. See, the biggest problem facing most tankless units is a buildup of lime and scale around the heat exchange elements. Not only does this compromise the lifespan your heater, but the lime also causes a severe impact on the efficiency of the entire system.

This often leads to longer burner cycles and a drastically reduced GPM. Flushing the unit helps clear any deposits and keep your heater free from mineral scale deposits and lime buildup.

Heater Warranty

Since tankless models do not have tanks that deteriorate due to years if storage, they tend to offer long term reliability. However, each brand offers its own unique warranty policies. Make sure you check your manufacturer’s terms.

Typically, most manufacturers require the product to be serviced or replaced if it was bought from a genuine source.

But here’s what you really ought to know:

Warranties for these types of water heaters are only applicable to the original owner of the product and valid only for the specified period. If in any case the heater was bought from an unauthorized dealer or you have tampered with the factory serial code, then you will not qualify for compensation. So make sure have proof of purchase and have the genuine article when claiming warranties.

How to Choose Tankless Hot Water Heaters

All right! We finally managed to convince you huh? But before you make that purchase, you still have a couple of factors to hone in on and a few questions to answer.
Think about it; are you buying the heater for your home or a business. And just exactly how much use will you get out of it per day? And can you even afford the damn thing in the long run?

All these and more questions are answered when you consider the following factors when shopping for a tankless warm/hot water heater.

  • Size

While some of the most popular electric models are as small as a book or shoe box, others like gas or propane powered models require more room for their valves, burners, and vents.

This means that gas powered units will definitely take up a lot more space than their electric counterparts. Make sure you picture where the heater will go as well as how much space you have available.

  • Power

This is by far the most important factor to consider when buying a tankless heater for your home. You will have to calculate how many gallons of hot water you need the system to pump out every minute. Similarly, you will want to check up the unit’s BTU and determine if its suitable for you.

Generally, the bigger your house is, the more powerful your heater will have to be. Getting the power requirements right will ensure that your heating system is sufficient for your home or business’s hot water requirements.

  • Price

Ah yes, the all-important aspect of the budget. In fact, most of us start considering the budget before anything else.

Basically, the more expensive models are usually gas or propane powered. However, that’s just the initial buying cost. They get cheaper as you use them. On the other hand, electric models are super cheap to purchase, but they tend to be more costly in the long run.

Installation Instructions

  • Step 1 – Turn off the main incoming water line to the house.
  • Step 2 – Disconnect supply line to old water heater if you were using a tanked system.
  • Step 3 – Disconnect power or heat source from the old heater.
  • Step 4 – After removing your tankless heater from the package, determine where you will place it. Make sure you allow for proper clearances to comply with state and local building codes.
  • Step 5 – Mount your heater on a wall, under the sink or anywhere appropriate.
  • Step 6 – Hook up the connectors; for gas powered units, hook up the ventilation. Electric models just plug in.
  • Step 7 – Turn on the water line and let it flow into the heater.
  • Step 8 – Hook up and turn on electrical lines for electric models and gas supply lines for gas models.
  • Step 9 – Light up the pilot light or switch and enjoy your hot water system with a much-needed shower.

 

9.5 Total Score
Our Verdict and Recommendations

Congratulations for making it all the way to the end of the journey. We really appreciate taking the time to know your tankless water heaters a little bit better. Hopefully, our guide has made it much easier to narrow down the type of water heater you’re looking for, or even managed to teach you something new. We’ve definitely done our part to inform and educate you; the rest is now up to you.

But just one more thing before you go!

We’re yet to announce our champion of the day and why we think this particular heater deserves a standing ovation. After much deliberation with our team of reviewers, we’re proud to announce the Rinnai RL75iN Natural Gas Tankless Water Heater as the best tankless hot water heater; the undisputed champion on our list.

It’s a well-known fact that Rinnai water heaters are among the most expensive pieces of equipment, but as always, you tend to get what you paid for. So we can definitely expect very high-quality components and service from this bad boy. But don’t take my word for it – get one for yourself and see what the fuss is all about. Trust us, your family and customers will thank you munificently for it.

Price
9
Power
9.5
Durability
9.5

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