Best Natural Gas Tankless Water Heater

Water heaters are responsible for heating and supply water to your household appliances and fixtures. Every house uses and needs a different amount of supply, so it is important to gain understanding towards the various types of water heaters that are available. Thus, you can decide what feature is the best option for your house thereby determining the best natural gas tankless water heater for yourself.

The natural gas tankless water heater popularity has increased in a lot of parts of the world. Despite the fact that it uses natural gas, so it’s more environmentally friendly, they also can save you money. This is a tremendous technological achievement. The natural gas tankless water heaters are innovative systems that allow you to save energy over the tank-type units. This type of technology heat water directly from the source, without the use of a tank as storage. Cold water will travel through a pipe into the water heating unit, using a natural gas burner to heat the water up.

Best Natural Gas Tankless Water Heater Products: Comparison Chart

Rinnai RUC98iN is the best natural gas tankless water heater
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Rheem RTG-64XLN ranked as #2

Rheem RTG-64XLN

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Takagi T-D2-IN-NG ranked as #3

Takagi T-D2-IN-NG

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If you want to buy the best natural gas tankless water heater but still have no idea what factors to consider, you may want to have a look at these points below:

  • The size of your household needs

This is the very first thing that needs to be taken into account, such as how many shower heads, bathtubs, sink, washing machine, dishwasher and water usage during peak water usage times that you be running at once.

  • Installation

The matters regarding installation issues are needed to consider.

  • Gas sizing information

It is essential to have a look and learn the installation manual of the unit you would like to buy and see the gas sizing requirements. Make sure that your current gas line, length, and size can provide sufficient flow to the unit.

  • Combustion air

Natural gas water heaters require combustion air. It is needed to be taken into consideration in which the way that combustion air will be delivered to your water heater unit, as well as knowing how much combustion air is required. It is even better to put combustion air outside the house because it will keep the air in your house cleaner, as well as keep your unit operating at its maximum performance.

  • Clearances

The placement of the unit is also an essential factor as every each natural gas water heater will have different measurements of distance that required for its clearance. That means they will need different length needed between the radiator itself and the other items of furniture or parts of your home, such as gas meter, electrical box, operable windows, etc.

Moreover, the best natural gas water heaters also offer many advantages:

  • Energy and money savings

The operational process of this natural gas water heater is not using any tanks. Thus, no water needs to be heated or reheated continuously which makes a lot of savings in energy uses. This energy savings naturally translates into cash savings.

  • Longer lifespan

The natural gas water heater also has a longer lifespan than the traditional one. This also means this type of unit needs less maintenance and less replacement.

  • Environmental friendly

If you are interested in contributing in conserving the environment, this natural gas water heater is a suitable choice for you. This unit has higher efficiency than electricity, as well as reducing the carbon that consumed in providing power for the heater.

  • Time-savings

Natural gas water heaters also have practical benefits. One of the useful benefits it offers is that this type of heater eliminates the time consumed to heat up the water before being able to use in the shower. The natural gas heater also has higher reliability in the circumstances of power outages. Even when the power shuts off, the unit still able to heat up the water so that you can still shower.

  • Fresher and cleaner water

Since there is no water being kept in any storage, the water that you will get is fresh and considerably cleaner. If you keep the water in the tank, there is a chance that the tank got rusted when there is no proper maintenance so you will receive water     contaminated with debris.

The Best Natural Gas Tankless Water Heater is Rheem RTG-84XLN ranked as #1, top pick!
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Top Pick: Rheem RTG-84XLN

Rheem RTG-84XLN designed especially for outside installation which offers you safety feature and eases your mind from gas combustion. It has a compact measurement which is 14x10x26 inches that make Rheem RTG-84 XLN a space saving unit.

It is also powered by natural gas which means it will lessen your gas bill. Rheem RTG-84XLN is suitable for mid to large-sized family living in a house with two or three full bathrooms. One of the unique features that Rheem RTF-84XLN offers is its ability to supply hot water to multiple faucets without dropping its temperature.

Although this type came as one of the industrial first makings, it remains become on top of the ratings amongst products that produced by Rheem. It’s heaters that are built internally into the units also beneficial in preventing the pipes from freezing during the winter season. The only limitation of this unit is that it needs professional handling for installation and there is a tendency for your water bill to increase if you are using this unit.

Rheem RTG-64XLN ranked as #2
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Budget Pick: Rheem RTG-64XLN

Rheem RTG-64XLN has similar features and specifications with the 84XLN one, with its outdoor installation and compact design at a lower price.

Rheem RTG-64XLN comes with a sleek appearance and very space saving. One of the interesting aspects that offered by this unit and not by the other unit is that its simplicity. This unit is straightforward to use and portable.

Rheem RTG-64XLN also comes with remote control and thermostat wire which makes it handier to operate it since it is designed for outdoor installation. The limitation of this type of unit is that Rheem RTG-64XLN is not capable of supporting high pressure and high temperature.




Takagi T-D2-IN-NG ranked as #3
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Takagi T-D2-IN-NG

Takagi T-D2-IN-NG is a highly efficient natural gas type of tankless water heater. The dimension of this unit is 11.2×17.8×24.9 inches which are only occupies a very little space in your home. It is designed for indoor installation that makes it more efficient in providing endless hot water to up to four bathrooms in your house.

Takagi T-D2-IN-IG is a perfect choice for people who are sensitive towards noises. It also has a PVC venting system which makes it more people friendly as well as environmentally friendly. Since it’s powered by natural gas, then there won’t be any heated air discharged out of the exhaust.

The materials of this unit also come in premium quality materials and seldom needs repair. The durability of this unit makes its lifespan longer. However, this unit has a quite high installation cost and requires professional handling. In some circumstances, it may need to has additional parts for installation that don’t come together with the unit.


These guidelines should able to assist you and give you insights in choosing the most suitable tankless water heater for your house. However, it is always recommended to get a professional opinion in assuring you to have the best unit for your home. To sum up, the four fundamental factors that need to be taken into consideration in making your purchase are energy efficiency, fuel type, type of warranty, and durability of the unit.

By comparing three of the most popular tankless water heater, in overall Rheem RTG-84XLN is a high-performance unit and suitable for medium to large family.

Although it has some minor shortcomings, it still becomes on the top-rated product, mainly because its ability in providing hot water into multiple faucets yet maintain the water temperature not to drop. Whereas, RTG-64XLN has a similar feature but lower price. As for Takagi T-D2-IN-IG has a high efficiency in providing a steady stream of hot water. It is also noiseless and suitable for large sized family.

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