Best Tankless Gas Water Heater – Guide & Reviews

Another name of tankless gas water heater is instant hot water supplier. This type of water heaters are designed with a variety of features and functions that make your uses easier. Having in mind that it has the maximum ability to save your energy cost. Due to their operation without water reserve tank you can avoid extra cost for storage water. The best tankless gas water heater runs by natural gas which is convenience and available at your home.

Water heating process works only when water is necessary that cut additional heating cost. The most remarkable indemnification that these water heaters are mostly familiar with the new building even replacing exciting to remodeling. Having in mind that here are over hundred of types tankless gas water heaters are in the market.

Whether you visit any shop, there will be too many options with various features and configurations.In this, I am going to share my research experience and some guidelines to find the best tallness gas water heater among multiple choice.

Things To Consider Before Buying The Best Tankless Gas Water Heater

You should not select a tankless gas water heater at your first step into the shop; there are some features to consider. You should spend some hours to analysis following facts that might help you to find the best. This instruction has identified based on research and analysis.


With any water heater to take a shower, wash dishes at the same time is a regular use of the water heater. Simultaneously doing few works requires high levels of capacity to make water hot at the same time. You might attend to the water heater as your need and try to select a comparatively large size to manage busy time.

Automatic Heating Option

Nobody is going to operate a tankless gas water heater. It is already known that they do not have storage to reserve hot water, an automatic function works itself when you open the water tap or shower head. Unless automatic features it would be difficult to get your desired temperature levels even you have to switch off when you finish.

Energy Saving

Although the best tankless gas water heater is perfect for energy saving. Without having an automatic function, it doesn't work right way like a well-insulated tank heater. However, you may face extra energy expense if any break happens with the gas line. To avoid an unexpected accident, you should use high-quality gas pipe for connecting water heater.


You must balance between your budget and water heater. To find your expected features, suggested policy is to avoid highly famous brands. Sometimes you may need to pay a large part of your money only for the name. However, should focus on the features that you need.

Water Heather


Natural gas is different from other natural energies; it 's hard to find the broken spot if anything happens with a pipe. Any accident can occur suddenly unless taking care of the machine regularly. You must focus on the best tankless gas water heater, which has a high standard safety system. High quality pipe cover could be extra safety.

Recommended Best Tankless Gas Water Heater

Until coming to this situation, we just discussed the best tankless water heater and some buying guide. However, the guides should help you. Still, if you are confused due to many essential facts, you can select our recommended tankless gas water heater.

Eccotemp FVI-12-LP High Capacity Tankless Water Heater

Editor's Rating:

Are you tired of cold showers? Well here's an opportunity to never run out of hot air again! Consider an imported water heater with an extremely sleek modern design.

The power ventilation for the best safety and topnotch power efficiency and a full range of gas and water controls.

That’s what the Eccotemp Propane Water heater is. The Eccotemp Power-vent Water Heater employs an intense propane flame which instantly heats water! Capable of storing 50 gallons of liquid, in a sleek and compact design, with a whopping 74,500 BTU's of Thermal Energy, this appliance is more than enough for all your water heating needs.

This efficient gas powered beast comes with lot of features and functions as well as long time use assurance in case something happens. Other than that the electronics and power ventilation provides optimum safety and many high capable unique features along with an impressive flow rate of 3.6 GPM. Capable of being installed right out of the box, it has compact and sleek design makes it ideal for houses and cabins.


  • Instantly heats water
  • Sotore 50 gallons of liquid
  • Provides optimum safety
  • Impressive flow rate
  • Sleek design, nice to look
  • Digital temperature display


  • Not enough for industrial use

Technical Details: 

  • Part Number: FVI-12-LP
  • Weight: 33 pounds
  • Dimensions: 4 x 15 x 24 inches
  • Origin: China
  • Size: 11-50 Gallons
  • Power Source: Natural Gas
  • Voltage: 110 volts
  • Flow Rate: 3.6 GPM
Rheem RTGH-95DVLN Tankless Natural Gas Water Heater

Editor's Rating:

Some things in life are essential. Winters can be formidable enough without having to bathe in the freezing cold water every day.

Sure water heaters exist but that spike on your utility bill isn’t a pleasant sight. But that’s where the Rheem Indoor WaterHeater comes in.

An efficient Gas Powered Water Heater that’s up to 94% energy efficient, packed with a stainless steel heat Exchange to better conserve your energy. Energy conservation often comes at the price of performance and efficiency. But not in this case, with the Rheem Water Heater, we got intelligent electronic controls that not only increase energy efficiency coupled boosts in performance, they also ensure your safety.

This water heater is jam packed with special features such as a self-diagnostic system for easy installation and service. Now you don’t need to be an accomplished engineer with a fancy degree to set up your Water Heater. Simplicity and ease of use is abundant. Here and one is bound to experience the luxury behind this appliance.


  • Save energy cost
  • Better conserve your energy
  • Coupled boosts in performance
  • Simplicity and ease of use is abundant
  • Intelligent electronic controls designed


  • Little expensive than others

Technical Details:

  • Part Number: RTGH-95DVLN
  • Weight: 79 pounds
  • Dimensions: 18.5 x 9.8 x 27.5 inches
  • Origin: Japan
  • Power Source: Natural Gas
Takagi T-KJr2-IN-NG Tankless Water Heater, Natural Gas

Editor's Rating:

An appliance that is perfect for light residential and radiant heating applications. It is great to get all the latest features into one water heater.

That’s an apt description for the Takagi T-KJr2-IN-LP Indoor Tankless Water Heater with all the latest and most updated features.

This elegantly designed absolute Work of Art Water Heater brings a 140,000 BTU and a 6.6 GPM maximum flow rate and an energy factor of 0.81-0.83. For a majority of residences, this provides an absolute bliss when you enter your bathtub after a long arduous day.

Also it comes with several security measures to ensure the safety of the consumer, such as inlet and outlet thermostats for constant temperature monitoring. The propane heating system happens to be one of the most effective heating systems on the planet and that’s exactly what the Takagi Indoor Tankless Water Heater uses.

With a liquid propane color, it has the appeal and the bliss to provide you the serendipity you crave! This product is perfect for most consumers who enjoy the bliss and the comfort of having warm water for their usage at all times.


  • Elegantly designed
  • Ensure high quality safety
  • Propane heating system
  • Instant hot water supply 
  • Constant temperature monitoring


  • Not enough for commercial or industrial use

Technical Details:

  • Part Number: T-KJr2-IN-NG
  • Weight: 38 pounds
  • Dimensions: 6.7 x 13.8 x 20.3 inches
  • Origin: Japan
  • Power Source: Natural Gas
  • Flow Rate: 6.6 GPM

Rinnai RUC98iN Ultra Series Gas Tankless Water Heater

Editor's Rating:

Technology is forever progressing. The best products are the ones who embody this principle and shape the trend of technology. With the recent updates technology also has touched to water heater too.

Such has always been expected from Rinnai and the Rinai Ultra Series Natural Gas Water Heater is no expectation.

What makes this heater different from other water heaters is that the Rinnai Tankless Water Heater takes tankless water heating a step further with condensing technology that delivers more efficiency that ever before.

So enjoy its features on an elegantly designed appliance which packs a 199,000 BTU punch, capable of heating water very quickly so that you have a comfortable bath! Rinnai offers professional installation and its space-saving design allows installation almost anywhere. It’s a beautiful blend of design, Energy efficiency and power. An all in one package!


  • Up to 96 Energy Factor
  • More energy efficiency 
  • Quick water heating 
  • Space-saving design
  • Ultra low NOx emissions
  • All in one package


  • Little costly for setup initially 

Technical Details:

  • Part Number: RUC98IN
  • Weight: 82 pounds
  • Dimensions: 10 x 18.5 x 26 inches
  • Origin: Japan
  • Power Source: Natural Gas
  • Voltage: 120 volts
  • Flow Rate: 9.8 GPM
Eccotemp i12-NG Indoor tankless heater

Editor's Rating:

This is a revolutionary device with a design unlike anything else on the market. That's the Eccotemp Indoor Tankless Heater.

It features a sleek acrylic glass casing which makes it a delight for the eyes. But it’s more than just a pretty picture.

It features the ease and simplicity of a touch screen for fully automatic temperature controls for precision and an LCD temperature and GPM display.

It is designed for medium hot water production making it ideal for vacation cabins, cottages and the like. It can prove to be one of the most reliable devices in your use no matter where you choose to set it up it.

However, it comes ready to install and only consumes a mere 2 watts of power making it extremely energy efficient. So prepare to enjoy an awesomely designed product that will let you enjoy your every morning!


  • Child locking technology
  • Automatic temperature controls
  • Comes ready to install
  • Sleek modern design
  • Small to medium hot water


  • Not for commercial use

Technical Details:

  • Part Number: i12-NG
  • Weight: 29 pounds
  • Dimensions: 16 x 16 x 11 inches
  • Origin: China
  • Power Source: Natural Gas
  • Voltage: 120 volts
  • Flow Rate: 3 GPM

Final Verdict

​The uses of natural gas are many, even it has been using since many years. However, using fir water heating in a heater machine is a latest and recent idea. Although there are lot of advantages of tankless gas water heater. Low energy cost, instant water heating, low setting cost etc. It is one of the critical task to find the best tankless gas water heater due to variations. 

We already have guide you all the possible that might be helpful if you follow accordingly. However, still if you are confused. then we would suggest to choice from our expert team recommended tankless gas water heater.

Jason Porter

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