The Best Tankless Gas Water Heater 2022

When deciding between a gas or electric tankless water heater, you should consider the size of your house. This is due to the tankless gas water heater having a far greater GPM (gallons per minute), which is required for simultaneously power of devices.

The best tankless gas water heater is the Rheem RTGH-95DVLN, which is 94% energy efficient and comes with its very own self diagnostic system for servicing.

Natural gas tankless water heaters provide unlimited hot water without the bills associated with the conventional water heater.  This is because tankless water heaters only heat the water as it is requested by the user.

See also  Gas vs Electric Water Heater

Table of Contents

Best Gas Tankless Water Heater

Tankless Gas Water HeaterUsageFlow Rate
Rheem RTGH-95DVLNIndoor9.5 GPM
Takagi T-KJr2-IN-NGIndoor6.6 GPM
Rheem RTG-84XLNOutdoor8.4 GPM
Rinnai RUC98iN Ultra SeriesIndoor9.8 GPM
Eccotemp FVI-12-NGIndoor3.6 GPM

Compared to an electric alternative, the gas tankless water heater is a far more expensive and this is due to the fact its more powerful. However, if you are upgrading from a conventional water heater, opting for a tankless water heater means you may qualify for tax credit, which may offset the initial cost.

Natural gas tankless heaters are also deliver a more consistent temperature throughout your house along with a high GPM.

Features and functionality differ between different units but of course, this is dependent upon your budget. Below is a list of the best tankless gas water heater that will efficiently power your home and save you money in the long run.

Rheem Tankless Natural Gas Water Heater

The Rheem Tankless Natural Gas Water Heater is a low nox water heater that’s been designed with energy efficiency in mind. The smart design ensures that water is heated only when you need it. It’s relatively easy to install and just requires PVC piping to connect and get up and running.

Below are some of the features of the Rheem tankless gas water heater.

  • Stainless steel condensing heat exchanger
  • 94% energy efficient
  • Self diagnostic system
  • Supplied with a 120 volt power cord
  • Freeze protection to -30 degrees
  • Connect with up to 38 feet of 3-inch or 5 feet of 2-inch PVC pipe
  • Small digital display with temperature and maintenance information

This durable water heater is one that you can install and manage on your own. It comes with detailed instructions and maintenance codes, so you can do all the service work yourself without having to pay a plumber.

The installation does take time, but once you are done you can expect it to work well with minimal maintenance needed. The Rheem tankless natural gas water heater is a reliable option for any homeowner concerned about energy efficiency.

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Takagi Indoor Tankless Water Heater

The Takagi Indoor Tankless Water Heater is a compact and energy efficient heater that is great for small homes. It is small enough that it can fit into tight spaces, and it has a nice design that won’t detract from the overall look of your home.

It’s Energy Star rated and uses continual temperature monitoring to ensure that the output is even in temperature. Here are some of the notable features of the Takagi Indoor Tankless Water Heater.

  • 120 volt electric connection
  • Max flow rate of 6.6 GPM
  • Thermistors monitor and control temperature
  • 4-inch category III stainless steel
  • Energy Star rated
  • Dimensions of 20.3 x 13.8 x 6.7 inches

The Takagi Gas Tankless Water Heater is an environmentally friendly heater with a compact design that packs excellent performance. It’s a good way to save space in your bathroom or kitchen while also having consistent hot water.

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Rheem Outdoor Tankless Natural Gas Water Heater

The Rheem Outdoor Tankless Natural Gas Water Heater is similar to many of the other water heaters that Rheem makes, but this one is suitable for use outside. It is a good option for larger homes that use water in several different applications.

It is Energy Star rated and has a good flow rate, so you can count on consistent heating. Here are the notable specs of the Rheem Outdoor Water Heater.

  • Runs at 8.4 gallons per minute at a 35 degree rise
  • Low nox water heater
  • Energy Star rated
  • UMC 117 remote control
  • 10 feet of thermostat wire for installation

This powerful water heater ensures that you always have water for your entire house. Although it is a big investment, it is one of the best choices if you live in a larger house and want to save money on your electricity bill. Overall, it is the best outdoor tankless water heater and made by a top brand in this particular industry.

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Rinnai Ultra Series Natural Gas Tankless Water Heater

The Rinnai Ultra Series Natural Gas Tankless Water Heater is another powerful tankless water heater that can be installed inside or outside. It has many features that make it more user friendly than other water heaters.

For example, it has a digital display with buttons to control the water temperature. It also has the option for either concentric or PVC venting, which makes it easier to install. Here are some of the specs of the Rinnai Ultra Series Tankless Water Heater.

  • 199,000 max BTU
  • Low nox emissions
  • Up to 0.96 energy factor
  • Compact design
  • Residential temperature range of 98 to 140 degrees
  • Dimensions of 18.5 x 26 x 10 inches

This water heater is very energy-efficient and has a sleek design that fits indoors. It works for both residential and commercial settings and can be installed in a few different configurations to suit your needs.

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Eccotemp Gas High Capacity Tankless Water Heater

The Eccotemp tankless water heater is a sleek natural gas tankless water heater that is designed to power your entire home with ease. It’s very easy to read and adjust thanks to a digital temperature display on the screen.

It’s also relatively easy to install, as it uses standard water fittings and plugs into an outlet for power. The heater is designed for comfortable indoor installation, as it is very compact and does not make much noise. Here are some of the notable features of the Eccotemp Natural Gas Tankless Water Heater.

  • 6 GPM flow only activates when in use
  • Digital temperature display and adjustment knobs
  • Plugs into standard 120 volt outlet
  • Uses 0.5 inch NT water fittings
  • Power ventilation for safety

The Eccotemp tankless water heater works well for powering your entire home. The easy indoor installation fits comfortably in your basement or even in a bathroom or kitchen. It’s also designed to be simple and easy to use, unlike many other water heaters, which can be quite complex.

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Tankless Electric Gas Water Heater Buying Guide

Since a tankless electric gas water heater is a big investment for your home, it’s important to make sure that the one you purchase is made with high quality materials.

Having a tankless water heater is very convenient, because you will always have hot water when you need it, and it is also an easy way to cut down your electric bill each month. Although you’ll pay more money up front for a good tankless water heater, you will save money in the long run because they save so much energy.

Above all, a tankless electric gas water heater needs to be safe, reliable, and easy to use. There are many factors to take into account when comparing different models – here’s what you need to look for when you are shopping.

GPM Rating

GPM, or gallons per minute, is possibly the most important factor to look at when shopping for a tankless electric gas water heater. The GPM rating indicates how many gallons per minute of water usage the heater can support.

The higher the rating is, the more hot water you will be able to use at one time. You can get an idea of how much water your household uses by looking at your showerhead, which usually has the GPM listed on it.

You should also look at your dishwasher and your washing machine to find out how much water they use. Generally, bigger houses are going to need a water heater with a higher GPM rating. Those who live in colder climates should also opt for a high GPM rating, just to give your household a buffer in the event of very cold weather.

The last thing you want when it is snowing outside is to have to take a cold shower. Alternatively, if you live somewhere very warm, you may not need a very high GPM even for a large household, because the water is much closer to the temperature that you need.

Installing Natural Gas Water Heater


The size of your water heater is another important factor. You will need to be able to compfortably install it somewhere in your home, whether that be under sink, in your basement, or outdoors.

Before buying a unit, thoroughly consider where you might want to place it, depending on your plumbing attachments, and then measure how much space you will need for it. Generally, compact water heaters are much more convenient. They also won’t be as much of an eyesore if you need to have them out in the open.

Ease of Installation

Installing any type of water heater can be a bit confusing, but some water heaters are easier to install than others. While you can pay a professional to install yours for you, you can usually install it yourself with a bit of preparation and some free time on your hands.

Before purchasing a water heater unit, do some research to find out exactly what type of installation is necessary. Do you need to buy extra parts, or does everything come with the unit? How many additional tools will you need? Does it come with comprehensible installation instructions?  And most importantly, is the heater even compatible with the gas line attachments in your home? All of these factors are very important considerations when purchasing your tankless electric gas water heater.

Energy Star Rating

Since one of the biggest reasons you might want to get a tankless electric water heater is to save money on your electric bill, you’ll definitely want to make sure that the one you purchase is energy efficient.

Not only is this better for your electric bill, but it’s better for the planet too. Look for an Energy Star rating when researching the water heater you want to purchase. Energy Star appliances use the most energy-efficient technologies in their industries.

Ideally, your water heater should only be using power when you actually need water instead of constantly running the way a tank water heater would.

Gas Tankless Water Heater

Display and Controls

It’s very helpful to look for a tankless electric gas water heater that has a digital display on it, so you can see exactly what temperature your water is being heated to. You should also be able to easily change it if necessary with knobs or buttons.

If you are looking at a water heater that doesn’t have these features, be sure to look at how you would control the temperature of the water, and make sure you can do so easily.

Noise Level

Water heaters can get noisy, but this can be very annoying for you as well as for your family members or even your neighbors. To avoid this, look into the noise level of the water heater before purchasing it. Some water heaters are specifically designed to make very little noise, which makes them much easier to live with.

Temperature Range

The temperature range on a water heater indicates the temperatures that the heater can reach. The wider range of temperatures available, the more control you will have over the comfort level of your shower. If you live in a colder climate, be sure to look for a heater with a higher temperature range that will keep you warm in the wintertime.


When shopping for a tankless electric gas water heater, be sure to look for something that is durable and has enough heating power to keep you comfortable, even in the winter. Energy efficiency is also very important to keep in mind. There are many different electric gas water heaters on the market, so it’s just a matter of finding the ones that work best for your home.

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