Best Gas Tankless Water Heater

A gas tankless water heater is a type of heater that operates on gas and doesn’t need a tank for water storage. A gas water heater can help you to save $108 per year, in energy costs. Tankless technology was used in the past. This technology implied water being heated and kept in a tank for later use. For hot water demand, you’d have to wait for the gas heater to heat up water and fill the tank again.

Some models will require you to wait for a couple of seconds before being provided with hot water, but this largely depends on how efficient the said model is. Tankless models start heating water only when you open a faucet, you spend no money while you are not using hot water. Gas tankless water heaters are very efficient mainly due to the fact that you do not have to constantly pay to keep your water hot.  Gas tankless heaters have a higher capacity than electric ones.

All gas tankless water heater comes with two major advantages:

  • Unlimited hot water
  • Powered by natural gas

Now, we’ll present you with some best gas tankless water heaters. Get ready for all the information about gas tankless water heaters that you can handle!


A tankless gas water heater is more energy-efficient than regular tank heaters. A regular tank water heater uses a lot of energy to keep the water in the tank.  A gas water heater has burners at the bottom of the tank which heats the water. Although a tankless gas boiler also uses burners.

When you turn on a hot water tap within your home, cold water will begin to run through the tankless unit. As the water passes, a flow sensor activates the burners. These will then begin to warm the heat exchanger.

The cold water coming into the unit encircles the heat exchanger. This, in turn, heats the water quickly before it leaves the heater. Tankless gas water heaters produce a higher flow rate compared to electric units.

Now, we’ll present you with some best gas tankless water heaters. Get ready for all the information about gas tankless water heaters that you can handle!

  • Rinnai RUC98iN Ultra Series gas tankless water heater.
  • Rheem RTGH-95DVLN gas tankless water heater.
  • Ecco temp i12-NG gas tankless water heater.
  • Gasland BE1581.58 GPM 6L gas tankless water heater.
  • Takagi T-H3-DV-N gas tankless water heater.

1- Rinnai RUC98In Ultra Series Gas Tankless Water Heater

Rinnai RUC98iN is an ideal gas tankless water heater. This is an indoor unit. Its design is also space-saving, thus allowing the heater to be installed indoors. If someones are continuously using the bathroom and have a large family and are in demand of warm water, it is more energy-efficient than electricity. It also has advanced technologies, which makes it different from others. It heats the water extremely fast and can distribute it in the entire household very fast. Starting at $1,540 plus the materials needed to assemble it and professional installation, RUC98iN is extremely expensive and maybe too much for the mid-range family’s wallet, as well as smaller households that are not in need of large water distribution.

It can output 9.8 gallons per minute. It can also be used for washing laundry several times before the water gets cold. Its innovative controls allowed it to heat extremely fast between the temperatures of 98 degrees F to 140 degrees F. It’s extremely compact and can easily fit into space. You can run the unit using either a concentric vent or PVC.

Its professional installation can take from between $3000 up to $4000, whereas the solo installation can take up to $1,500, which is too much for a smaller family to handle.


  • Energy-efficient, relatively compact, ultra-fast.
  • Works with either concentric or PVC vents.
  • Up to 0.96 Energy Factor.
  • 95% Thermal efficiency.


  • Extremely expensive, may require additional OEM parts.

2- Rheem RTGH-95DVLN Gas Tankless Water Heater

In the US, the company that has come close to the gas tankless water heaters are concerned is Rheem. It makes both electric and natural gas water heaters. Their more well-known gas-powered model is the Rheem RTGH-95DVLN. The heater has a condensing heat exchanger made from stainless steel. It also features intelligent electronic controls, which are specially designed to increase the heater’s energy efficiency, as well as safety.

This is the modern gas tankless heater with a built-in condenser. The Rheem condenser can propel the RTGH-95DVLN for an average EF of 0.8 to a super high of 0.94. That means that Rheem RTGH-95DVLN producers only 6% energy loss.

The Rheem gas tankless water heater can heat water anywhere from 85°F to 140˚F very quickly and most cost-effectively. Rheem RTGH-95DVLN is a powerful HVAC device that can achieve the maximum hot water flow of 9.5 GPM. Rheem RTGH-95DVLN is a powerful HVAC device that can achieve the maximum hot water flow of 9.5 GPM. That’s enough, for a larger household. The heater is compatible with a two-pipe direct vent system that is designed for PVC pipe.


  • Best American-Made tankless gas hot water heater.
  • The two-pipe direct vent system.
  • 94% energy efficiency.
  • Built-in electric blower.


  • Not the easiest unit to install due to the condenser

3- Ecco temp i12-NG Gas Tankless Water Heater

The Eccotemp i12 tankless water heater is perfect for modern small houses. This is suggested for the household that requires hot water for one, or possibly two, applications. This unit is an indoor model. The heater is rated at 3 GPM. It activates only on-demand, and it doesn’t require any pilot light. The Eccotemp i12 has been tested at elevations up to 2000 feet. Installation and use of the Eccotemp i12 above 2000 feet may affect overall product efficiency and performance.

It has a unique design with its tempered black glass and touch screen control display. It has also a small LED screen showcasing output temperature and gallon per minute flow rate. This product can help you reduce energy consumption. This model also offers a 35 to 40-degree Fahrenheit temperature rise when operating at a flow rate of 4 GPM and a 77-degree Fahrenheit temperature rise at 1.5 GPM. One of the best features is the child locking technology. Some features of Ecco temp water heater are:

  • LED Display
  • 4 GPM flow capacity
  • Weighs only 33 pounds
  • 3 GPM flow rate
  • 80,000 BTU
  • Child looking display


  • LED screen and touch control display.
  • Features child locking technology.
  • Safe electronic ignition system.
  • 3 GPM flow rate.


  • The installation process may be a bit difficult.

4- Gasland BE1581.58 GPM 6L Gas Tankless Water Heater

Gasland 1.58GPM 6L outdoor portable tankless water heater. It has a compact size and lightweight design. Flame failure devices, anti-freezing protection, overheating protection can ensure family safety. Its maximum power output is 41,000BTU/Hr. if the water pressure goes above 110 psi, the heater will automatically decrease it to keep things safe. It just needs 2.5 PSI of water pressure.

This water heater automatically decreases water pressure between 2.5-110PSI. It provides high water temperature protection over 167 °F. It features a lightweight and compact design, making the product very easy to carry and mount. The back and the top of the heater feature mounting brackets that can be used to install it in a matter of minutes. Gasland has some features are as follows:

  • Wattage: 12 000 watts
  • Maximum Weight Capacity: 10,4 pounds
  • Hose length: 5 feet
  • Activation Flow Rate: 2.5PSI / 0.44GPM
  • Maximum Power: 41000 Btu /hr.
  • Flow Rate: 1.58GPM / 6L


  • It has several safety systems in place
  • It features a lightweight, compact design


  • The instruction manual doesn’t refer to the use of the product’s front dials.

5- Takagi T-H3-DV-N Gas Tankless Water Heater

The T-H3-DV-N is well suited for small houses and restaurants. The T-H3 is also suitable for heavier residential usages because it utilizing commercial-grade copper alloy for the heat exchanger tubing such as space heating or domestic recirculation systems. It is a more compact and space-saving device. Takagi T-H3-DV-N is one of the most cost-saving gas tankless heaters.

It has a compact design, which makes it easily placeable anywhere in the apartment or the house. The secret behind the high energy efficiency of the Takagi gas unit is the condenser. A condenser to a gas tankless heater can increase energy efficiency by more than 10%. Takagi T-H3-DV-N has ultra-low NOx emission. It has various computerized features, which adjust the temperature and provides on-demand usage, which makes it more compatible.

It sports all the necessary protective settings that allow improved safety. The company also said that the water heater satisfies the 2012 SCAQMD Rule about ultra-low NOx emissions. Although once the process is done, it’s one of the best gas tankless water heaters on the market.


  • Energy Guide calculation for yearly energy cost is $172.
  • Modern design, various computerized features, safety enhanced, environmentally-friendly.
  • Comes with a top-of-the-line Japanese standard warranty.


  • Not the easiest unit to install due to the condenser.


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