Best Gas Tankless Water Heater Reviews 2017

Nowadays, many households are upgraded in terms of installing tankless water heaters in an attempt to save money, space and time. It is known that gas heaters save on average 108$ per year because they use 30% to 50% less energy than heaters with a storage unit.

Running on natural gas or propane, these water heaters are 23% more efficient than storage version. The difficult decision is whether to go for a gas or an electric heater. We have compiled five tankless gas water heater reviews in hopes to help you determine which one is most suitable for your household.

There are numerous models of tankless gas water heaters on the market today and choosing one has become quite a challenge. What are the things you should look for in a gas powered tankless water heater and what makes a certain model the best tankless gas water heater?

5 Best Tankless Gas Water Heaters

Best Gas Tankless Water Heaters

A few factors will have to be considered prior to making a purchase when it comes to tankless gas water heaters.

You need to ask yourself whether you want a unit that will heat the water only in the bathroom or do you need a unit that can cover the whole house?

The heater’s capability is crucial when it comes to functionality of the unit. Checking heater’s requirements is also important because natural gas tankless water heaters need proper venting.

A significant factor to consider is quality, which you should be looking for if you don’t want to experience malfunctions and costly repairs. And finally, consider the price.

Today’s gas tankless water heaters go from a few hundred dollars to 3000$, depending on the quality and capability.

Comparison of 5 Top Rated Gas Tankless water Heaters Review

Takagi T-KJr2-IN-NG6.6
  • Non-Condensing Natural Gas Tankless Water heater
  • Inlet, outlet thermistors for constant temperature monitoring
  • Perfect for light residential (i.e. small apartment units) and radiant heating applications

Rheem RTG-64XLN
  • Environmentally friendly Ultra Low NOx burner
  • Overheat film wrap (OFW) to protect the heat exchanger
  • Innovative and energy efficient water heaters provides continuous hot water from

Marey GA10LP
  • Compact design saves space and is easy to install
  • Saves up to 60% on electricity bills for water heating!
  • It can last a lifetime, keeping 87% efficiency level!

Rinnai V65EP
  • Temperature lock prevents accidental or unauthorized changes
  • Perfect for one to two and half bathroom home
  • Easy-to-install, ultra-compact unit saves energy & precious floor space

Rheem RTG-64XLP
  • Outdoor and Residential Propane Tankless Water Heater
  • continuous supply of hot water from energy efficient and space saving design units
  • You will never run out of hot water again

Having all that said, we can move on to our five best tankless gas water heater reviews!

Takagi T-KJr2-IN-NG Indoor Tankless Natural Gas Water Heater

With the energy factor of 0.81-0.83, Takagi T-KJr2-IN-NG tankless gas water heater is one of the most efficient units on the market, when it comes to saving energy at least. This water heater is the smallest unit of all Takagi heater series produced until today. Small size and compatibility make this on demand gas water heater suitable for small apartments.

This is one of the best tankless gas water heater offers quality heating within seconds. Unlike many units on the market, this heater is resistant to hard water, meaning that the composition of water in your house will not damage the system. This may just make this model the best natural gas water heater out there. This model, however, cannot be installed outdoors but that feature is available with the Rheem RTG-64XLN model.

The high quality heat exchange process heats up water as it runs through the unit, meaning you will have hot water on demand, whenever you need it. Even though this Takagi model is suitable for small apartments due to its size, it can cover a full house of 2 or 3 bathrooms.

The size of the unit allows you to place it anywhere you desire. It will save you storage space wherever you decide to install it, which is one of the great features of tankless water heaters. With 140,000 BTU and 6.6 GPM maximum flow rate, this heater model has the capability of providing enough hot water for two showers at the same time.

A minor disadvantage or rather a limitation is the warranty. You will get a 10 year warranty for the heat exchanger and 5 years for the parts of the unit. That is for residential applications only. For commercial applications, the warranty is 3 and 5 years. However, no warranty is valid unless you had the unit installed by a professional, licensed technician.

Altogether, this gas tankless water heater is one of the people’s favorite models on the market for its efficiency and compatibility. If you have a family of five or less people, this water heater is perfect for your household needs.

  • Suitable for small apartments
  • High quality heating
  • Handles hard water
  • Heats the full house
  • Energy saver
  • limited warranty
  • possible malfunctions


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Rheem RTG-34XLN – Best Outdoor Natural Gas Tankless Water Heater

This natural gas water heater is one of the most convenient models because it can be installed outdoors. It has many beneficial features that will make your everyday life much easier. The Rheem RTG-34XLN model will surprise you with its capability of providing hot water in your home!

Rheem RTG-64XLP 6.4 GPM Low NOx Outdoor Tankless Propane Water Heater

With 0.40 GPM minimum activation flow rate, this environmentally friendly natural gas burner will provide you with hot water on demand. A unique feature of this model is the high-altitude capability, meaning it can run with up to 9,840 ft. elevation above sea level. The outdoor installation will save you space in your home for other storage purposes.

This on-demand gas water heater is an improved model from the Rheem water heater series will provide you with an endless supply of hot water on demand. With the high end technology, this unit is the next generation model of tankless gas water heaters. It can also be controlled remotely which is a great advantage.

Depending on the power supply, Rheem RTG-64XLN can provide 6.8 gallons per minute at 35A and 5.3 gallons per minute at 45A. The fast water supply is one of the best advantages of this water heater model.

As with many other units on the market, the disadvantage is the limited warranty. This model offers a 10 year warranty for the heat exchanger and only one year warranty for the part. This means if anything goes wrong other than the heat exchanger, in a year or two you will have to handle the costs of the repair process.

When we add everything up, Rheem RTG-64XLN model is a great and powerful tankless gas water heater recommended for every household of five or less people. It provides hot water efficiently and can meet all requirements of 2 bathroom houses.

  • Endless supply of water
  • High-altitude capability
  • Outdoor installation
  • Energy saver
  • Remote control
  • Very limited warranty
  • Costly repairs


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Marey GA10LP Power Gas Tankless Water Heater

Marey Power Gas Tankless Water Hester is one of the best solutions for homes in need of hot water on demand, especially the homes that experience frequent power outages since this model does not require electricity to run.Marey Power Gas 10L 3.1GPM Natural Gas Tankless Water Heater

With its amazing features and 54% to 87% of efficiency, this water heater will satisfy the needs of any household. Its manufacturer has been on the market since 1955, ensuring you what they deliver is completely high quality!

This tankless gas water heater can provide you with unlimited amounts of hot water on demand. One of the unique feature is that you can regulate the water flow as well as the gas flow to achieve a better temperature of the water. That is something that’s not available with most of the gas heater units out there.

The Marey power gas tankless water heater can provide 2.7 gallons of water per minute. Its high quality technology guarantees there will be no leaks in the system, meaning the unit is completely rust proof. No rust means less maintenance which is another money saver. The unit is compact and can be installed anywhere, saving you enough space for other storage purposes.

This unit as well has a limited warranty. The Marey water heater model has a five year warranty on all parts, unlike certain models that have a much longer warranty for the heat exchanger of up to ten years. This feature, however, is available with the Rheem RTG-64XLN model reviewed above.

In conclusion, this tankless gas water heater unit is highly efficient and suitable for installation pretty much everywhere. It comes with a user manual and is fairly easy to be installed on your own if you are familiar with such installations. This model is highly recommended!

  • Saves space
  • Unlimited supply of water
  • Manual water temperature regulation
  • Rust proof
  • Energy efficient
  • Short warranty


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Rinnai V65EP – Best Propane Tankless Water Heater

Rinnai V65EP is another tankless gas water heater unit that supports outdoor installation. This model is one of the most powerful Rinnai models on the market, for its ability to provide enough hot water for a house with two and a half bathrooms. What makes it one of the best natural gas water heaters out there is the error code indicator, a feature that can detect and prevent large damage to the unit.

Rinnai V65EP 6.6 GPM Outdoor Low NOx Tankless Propane Water Heater

With the energy factor of 0.82 and the minimum activation flow of 0.4 gpm, this tankless gas water heater can heat water very quickly, being an efficient energy saver for your household.

This on-demand propane water heater model has quite a few unique features that make it stand out on the market. It is certified for installation in mobile homes, which is something not many heating units offer. Also, the Rinnai V65EP model has a temperature lock feature that prevents temperature change, whether accidental or unauthorized.

This tankless gas water heater has a huge capability of providing up to 6.6 gallons of water per minute. The water it provides is clean and of a consistent temperature, thanks to the temperature pre-set feature. Once installed, the unit is automatically set to 120 degrees F but it can be adjusted by the installer up to 140 degrees F. The water temperature does not change at any point of the flow.

Next to all these great features, there is only one disadvantage, as with most of the models, the warranty. You will get a 10 year warranty for the heat exchanger and five years for other parts. However, you don’t need to worry much about malfunctioning thanks to the error code indicator that lowers the possibility of a break down.

In conclusion, the Rinnai V65EP model offers a ton of amazing features that are rarely seen among other units on the market. You can definitely not go wrong with this model because the efficiency and quality are guaranteed!

  • installation in mobile homes
  • error code indicator
  • temperature lock
  • pre-set temperature feature
  • efficient energy saver
  • limited warranty


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Rheem RTG-64XLP Outdoor Tankless Propane Water Heater

Last but not least on our list of best tankless gas water heater reviews is the Rheem RTG-64XLP model. Suitable for larger household and mobile homes as well, this model is capable of delivering endless supplies of water on demand.

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

Supporting outdoor installation only, this tankless gas water heater unit will save the precious space in your home. Being able to provide up to 6.4 gallons per minute at 35 degree rise, this heating unit surely won’t let you down when it comes to your hot water on demand needs.

The minimum activation flow required is 0.4 gallons per minute, meaning the water heats very quickly inside this unit.

The Rheem RTG-64XLP model has the remote control feature, adding to its convenience and quality overall. Something unique about this model is the EZ-link cable which comes with it.

This cable allows you to connect two tankless water heaters to operate as one, which can increase the capability and the amount of hot water delivered. This option is the perfect solution for large homes consisting of five or more people.

Most issues come from badly done installations so make sure you have a professional, licensed technician get the unit ready for use. As usual, the limit here is the warranty, which in this case is 10 years for the heat exchanger as the main part of the unit and only one year for other parts.

Altogether, Rheem RTG-64XLP is an outstanding model on today’s market. One of the best natural gas tankless water heaters and an efficient energy saver at the same time. Compared to other units, it is one step ahead with the EZ-link feature, enabling large homes to have a large enough hot water supply at all times.

  • outdoor installation
  • remote control available
  • quick heating
  • energy saver
  • EZ-link cable
  • possible malfunctions
  • limited and short warranty


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Buying Guide for Gas Tankless Water Heaters

Today’s market is full of new brand names and heater models, each one trying to compete for your attention.

Choosing the best tankless gas water heater is very difficult in those conditions where brands fight to stay above each other by adding newer and more advanced features to their models. So, how do you know which water heater model is the right one for you?

We hope our five tankless gas water heater reviews have helped you understand certain features of heating units and decide which one is suitable for your hot water needs. However, if you’re still indecisive, here is our buying guide to give you a few more pointers on what to look for.

First and foremost, you will need a heater that can meet all your home’s requirements. That means taking into consideration the number of bathrooms in your house as well as the number of people living in it.

Once you narrow down the list of products to those that suite your needs, you can move on to the next deciding factor which is the quality. There is no point wasting money on a unit that will malfunction in a year or so.

Look for customers’ reviews and see how their units are doing so far. With good quality, however, comes a higher price. Taking your budget into consideration is crucial to be able to get the best for your money.

If you are willing to invest a bit more in higher end brands, that is going to pay off in the future. However, some of the cheaper options are also quality enough to supply hot water regularly.

Taking factors such as the price, quality and capability is important for bringing a valid decision regarding your purchase. We hope our review has helped you decide which the best tankless gas water heater is for you!