Best Natural Gas Tankless Water Heaters in 2018

Wasting time reading useless gas water heater reviews online? Well, stop because we can help you choose the best gas water heater.

Below you will find detailed tankless gas water heater reviews. All of the units are from the top brands and have been tested. So, feel free to check them out and find the one that works out the best for you.

Having a natural gas tankless water heater installed in your house can help you get on-demand hot water. There’s no need for you to wait while the water warms up anymore. Simply turn the faucet and enjoy a shower with the hot water you’ve been looking forward to.

Best Natural Gas Tankless Water Heaters: Comparison Table.


Yearly Energy
Cost Saved

Average Gallons
Per Minute Heated

#2 Tankless Water Heater - Rheem RTGH-95DVLN

Highest Quality​


9.5 gallons

#5 - Tankless Water Heater - Takagi T-KJr2-IN-NG


6 gallons

#6 - Tankless Water Heater - Rinnai RL75iN


7 gallons

#6 - Tankless Water Heater - Rinnai RL75iN


1.5 gallons

#6 - Tankless Water Heater - Rinnai RL75iN


3 gallons

#6 - Tankless Water Heater - Rinnai RL75iN


6.5 gallons

#6 - Tankless Water Heater - Rinnai RL75iN


9.8 gallons

Mentioned above were some of the natural gas tankless water heaters available in the market. Read on for know more about each of the best gas water heater brand.

These heaters have provided excellent performance, and most of them come with lifetime guarantees. These companies also provide the best customer services and technological support.

All of the recommendations have been tested so take your pick to find the best gas water heater brand for your use!

Best Tankless Gas Water Heater Reviews

  • Best use of natural gas.
  • Highest quality.

* You'll can also find the Rheem RTGH-95DVLN in our ​Definitive Best Tankless Water Heaters Guide

#1 Tankless Gas Water Heater -  Rheem RTGH-95DVLN

This is because the name Rheem is synonyms with high performance, great value, and excellent features. It provides a variety of water heaters aimed to suit different people according to their varied requirements and budgets.

RTGH-95DVLN is a natural gas tankless water heater produced by Rheem which combines comfort with value making it one of the best water heaters available.

This model provides the customers with the convenience and comfort of running hot water even to homes that have large families. This model is the perfect solution to all your hot water problems.

This also helps to make it a good choice as a best gas hot water heater.

Energy efficient

This model has a stainless steel heat condensing exchanger which makes this unit 94% energy efficient. This helps you to save money and leaves a lighter environmental footprint.

This is a very safe unit as it takes into account all the safety precautions needed to operate a natural gas water heater. The electronic controls of this heater make it not only safe as well as energy efficient. 

Bright display

The self-diagnostic system of this natural gas water heater is another fantastic function that makes the service and installation of this unit very straightforward and easy.

The display panel prominently shows the maintenance codes and the temperature making it easier to keep a check.

Safe and reliable

Another great feature is the Guardian OFW Overheat Film Wrap which keeps the unit from overheating. This film wrap also protects the built-in electrical blower. The beauty of this unit is that it is a sustainable water heater.

When you buy a Rheem water heater, you can be sure of reliability and quality. They keep a regular check on all the departments of production from the supply of raw materials to the delivery of the finished product.

Their water heating products are periodically tested by certified labs and the government to ensure their high quality and safety requirements. 

Heats large quantities of water

In an average home the Rheem RTGH-95DVLN can easily run two sinks and a dishwasher and two showers all at one time because it can heat 9.5 gallons of water per minute. This even leaves you with a lot of extra hot water!

Continuous hot water supply

The best feature of this water heater is that the water stays hot once it is heated so when you shower you do not need to adjust the controls continuously. The water is not hot for one minute and cold the other.

The supply of hot water is continuous due to the superb heating of this unit. If you use natural gas as the energy source for your water heater, then this is the unit for you.

  • It heats large quantities, 9.5 gallons, of water in a minute making it possible to get hot water in multiple taps at once.
  • It saves energy up to 94%.
  • It uses natural gas as the power source which is convenient and efficient.
  • Self-testing ensures the highest quality and safety standards.
  • Installation and setup of this unit are a little laborious and complicated.
  • Initially, it might take a few moments to get hot water in the faucet.

Natural Gas Tankless Water Heaters Buyer’s Guide

Some things to keep in mind when finding the best gas hot water heater:


Different locations require different water heaters depending on the temperature and climate. Before purchasing a water heater, it is important to take into account the weather conditions of your city because they affect the efficiency of your unit.

Colder climates require a more powerful water heater to supply the amount of hot water needed while in warmer climates the water heaters produce more hot water gallons in a minute.

Plumbing System

Before buying a water heater get a survey done by a professional to make sure which unit will work best with your existing plumbing system. The installation guide provided with the heater will give you the specifications needed to make your heater fully operational.

Determine Flow Rate

Determine the flow rate of hot water required in your home before buying a water heater. This will help you purchase a water heater best suited to your needs.


A water heater is not only an investment in an appliance that provides hot water on demand it can also help you save on energy costs.

Natural gas tankless water heaters are the best water heaters to buy because of low utility costs, and they are more energy efficient than heaters with water tanks. They supply hot water consistently and take up less space. You also don’t have to wait for them to heat water before you can go ahead and use it.

When in the marketing for the best gas hot water heater, make sure that you buy one that is able to keep up with the water flow. Buying one with a low GPM is going to be useless for a big household. It should also be easy to maintain.

We hope that after reading through the natural gas water heater reviews you’ll be able to find the best gas water heater for yourself.