Best Gas Water Heater Reviews 2020 – Top Rated & BUYING GUIDE

Best Gas Water Heater Reviews

The water heater is one of the essential household appliances, especially in cold areas. However, the conventional tank-based heaters typically leave users with a huge utility bill by consuming a lot of energy.

So why don’t you go for a gas-powered water heater?

These gas water heaters operate more efficiently, thereby saving you a ton of money paid for electricity. They are suitable for any households, and once installed, you will have access to an unlimited amount of water.

Let’s scroll down for the three most sought-after gas water heaters on the market now!

Top 3 Best Gas-powered Water Heaters 2020




​Eccotemp i12-NG Tankless Water Heater – Best Budget For Small Households

​Takagi T-T-KJr2-OS-LP Outdoor Tankless Water Heater – Best Large Capacity Heater

​Rheem RTG-64DVLN Tankless Natural Gas Water Heater – Best Energy-saving Heater

​Editor's Rating:

​4.2 / 5

Our first impression of this model is probably its revolutionary design. This gas water heater looks exactly like a hi-tech device with a sleek black casing, touch-screen and an LCD showing temperature as well as GPM flow. The LED display controls are incredibly user-friendly, so rest assured that you can get the hang of it in no time.

The manufacturer provided no pilot light for energy-saving purposes. Do not worry; you can see everything from ignition to full operation via the front panel display.

This i12-NG has a 3 GPM flow while operating at a 35-40 degree rise, quite impressive compared to other models in the same price range. To be more specific, 3 GPM is enough for two appliances using hot water at the same time, for example, dishwasher and shower. This fully automated water heater is most suitable for small houses or cottages, which have considerable demand of hot water.

What about energy consumption?

This unit consumes about 2 watts and 1.07 amps while working, thereby making it an ideal energy-efficient tankless water heater. As it is flow activated, there will be no gas consumption until hot water is on. Amazing, isn’t it?

The i12 model comes with a horizontal venting made of stainless steel for easy installation. Plus, you can hang the water heater on the wall to save space. The model still works wonders even if installed 4000 feet above the ground.

One word of caution: the machine is not suitable for freezing areas with sub-zero degrees. The cold air will flow back through and freezes the heat exchanger.

The manufacturer advised users to drain and disconnect the heater to prevent any troubles arising from the cold snap. If you desperately need hot water, the terminated vent kit and the backdraft preventer will be of great help.

The Ecotemp i12 design is backed with a 2-year limited warranty.


  • ​Sleek design
  • ​Flow activation
  • ​Touch screen
  • ​Lightweight
  • ​Space-saving


  • ​A frozen heat exchanger in sub-zero temperatures

​Editor's Rating:

4.1 / 5

Takagi is a well-known brand with years of experience in producing quality water heater. You will certainly get the money paid off with this top-notch outdoor gas-powered water heater of Takagi.

As the smallest unit in the Takagi lineup, this model creates a maximum of 6.6 gallons per minute with 140,000 BTU per hour. Feel free to use hot water for various tasks without putting a strain on the system. In other words, this tankless heater can produce hot water for a whole family at one time.

Good news for those living in bitterly cold areas is Takagi allows this model to withstand outside temperature dropping below sub-zero degrees. The temperature restriction is stated below -30 degrees. However, it is recommended to drain the tank overnight to prevent freezing the heat exchanger. Better safe than sorry, right?

This model is a propane unit which is suitable for installing outside only. If you receive the equipment by delivery, carefully check to make sure it is your order. Takagi produced a similar heater, but it runs by natural gas and suits indoor installation.

For residential use, the manufacturer offered a 12-year warranty for the heat exchanger, 5-year for the parts and 1-year for labor. However, note that if you install this water heater on your own, you will be ineligible for the warranty. Water heaters of Takagi must be installed by licensed personnel.


  • ​Reliable manufacturer
  • ​Large capacity
  • ​Long warranty
  • ​Freezing temps allowed


  • ​Outside installing only
  • ​Warranty for licensed installation only

​Editor's Rating:

4.1 / 5

Claiming as the perfect hot water support, this Rheem heater got several useful features to offer. This item provides a continuous supply of heated water while saving a lot of energy. With this model, you will never run out of hot water while taking a shower or doing the laundry again.

The maximum flow rate of this model is about 6.4 gallons per minute at 35 degrees rise. There is no need to go for larger or more expensive items, as this one is enough to serve your demand. Moreover, it is incredibly energy-efficient, which can even reduce your gas consumption by half.

The installation process is relatively straightforward, and you can complete it yourself. However, you need to purchase some extra parts for installing, including 3" by 5" concentric B-vent and vent cap on the outside part. These pieces will cost you quite a bunch of money, unfortunately.

You can receive technical advice from Rheem tankless support when installing the heater. Set your mind at rest as the customer service of this manufacturer is extremely responsive and helpful. Just make a call, and the technicians will patiently answer all your questions.

The only downside of this product is that the hot water line does not stay warm all the time.

Therefore, if the heater is not running for some hours, the water will turn cold. You will have to get rid of these cold water first before soaking in hot water. This is quite inconvenient a problem, especially when you need a quick spurt of hot water.

If your item has leaking issues, you should contact the Rheem Technical Service Department for assistance. Only leaking products can be replaced with a current model; otherwise, making repairs is recommended.


  • ​Lightweight
  • ​Responsive customer service
  • ​Energy-efficient
  • ​High flow rate
  • ​All-time available hot water


  • ​Extra parts needed
  • ​Cold water alert

Parting Thoughts

We have just presented you with the top 3 best gas water heater available on the current market. What these items have in common include reasonable price, top-notch quality, and energy-saving design. Get your money well-spent with one of the three products above.

If you find this article useful, please like and share with your friends. Leave your questions in the comment section, and I will reach out to you as soon as possible. Thank you for reading.