The Top Reputable Tankless Water Heater Brands

There are several manufacturers that produce outstanding tankless water heaters. The only problem is that some brands build high-quality, premium units that may be outside of the average household budget.

Other brands build excellent mid-range units, while others provide entry-level items that are designed more to support an existing tank-based system.

Here are the best tankless water heater manufacturers and what to expect from them.

1. EcoSmart

This brand is a continual favorite for online shoppers. It offers a variety of affordably priced tankless water heaters that offer between 2-5 gallons of water support per minute. Their models are about 50% lower in price than comparable brands, and there are several options from which to choose.

EcoSmart tankless systems are ETL Certified to UL 499. Local product support is available through many major retailers, including Amazon, The Home Depot, and Ace Hardware Stores.

2. Rheem

This brand was founded in 1925 as a family company. The Rheem brothers, Donald and Richard, began by building steel shipping containers and home appliances. They have built everything from musical instruments to semiconductors. Today, this brand is the largest manufacturer of water heating products in North America.

EcoSmart is within the family of brands that fall under the Rheem name. Other brands include Eemax, Richmond, Ruud, and HTPG.

3. Rinnai

Rinnai has provided nearly 100 years of innovation in U.S. manufacturing. There are one of the only tankless water heater manufacturers that uses its own state-of-the-art testing laboratory in Canada, employing more than 600 accredited lab technicians, research engineers, and development engineers. All products meet or exceed CSA ad ANSI standards.

The brand is headquartered in Japan, with 20 subsidiaries and 85+ sales offices in 13 countries to provide a complete level of customer support, from purchase to installation. That level of support has led this brand to become the world’s leader in providing tankless water heater systems to homes.

4. Takagi

What makes this tankless hot water system manufacturer unique is that it is only sold by licensed contractors. That means there are trained professionals assigned to your region to help you with your new system.

That also means one must be careful when purchasing a system from this brand online. Purchases from non-licensed entities may not be covered under the published warranty.

Takagi also provides an extensive series of online help options for owners, from plumbing diagrams to troubleshooting guides. There is also a complete set of instructions for professionals licensed by this brand to sell and install tankless systems.

  1. Noritz

This brand may be one of the newcomers to the hot water system industry, though they still have more than 60 years of manufacturing experience. Noritz offers a total of three different systems to provide homes with hot water through a customized approach.

Their systems have more flexibility than other systems, including outdoor or indoor placement, without compromising the quality of the manufacturing process.

Noritz is also one of the few brands that own every aspect of the manufacturing process. Every unit comes with a 12-year, non-prorated warranty.

6. Navien

Navien was founded in 2006 to focus on the condensing technology sector within the tankless industry. Since then, this brand has become one of the fastest-growing companies in its industry within the North American Market.

It is a wholly-owned subsidiary of KD Navien, which has 35+ years of industry experience with water heating and advanced boiler technologies.

This brand operates three training centers to maintain the consistency of its brand. Products are sold by and installed by professional contractors to ensure that every home receives the hot water they want and when they want it.

7. Bosch

Bosch offers one of the best warranties in the industry today, offering replacement parts protection for up to 15 years. When your tankless water heater is installed by a professional Bosch-certified contractor, you receive an additional year on that warranty as well.

This brand also offers an exclusive design that is intended to prevent scale buildup from occurring. They use heat exchangers with a fully modulating vertical burner that allows for more evenness in the heating experience. When added to the turbulators, scale levels are much easier to control.

This brand is the only option for 2-degree precision control across the entire hot water temperature spectrum as well.

8. SioGreen

SioGreen Logo

If you are looking for an infrared tankless water heater, then you will definitely come across this brand. SioGreen is ideal for larger homes and medium to large commercial spaces that have high hot water demand.

These water heaters offer energy efficiency and power with its Quartz infrared heating elements that are used to heat the water. You can also use this system to upgrade an existing system, even if it is a conventional unit that uses a tank.

9. StiebelEltron


StiebelEltron has been in the water heater industry for over 90 years and is a trusted and reputable brand known for its efficient products, including their line of digital tankless electric water heaters. They began their company by manufacturing the first immersion water heater back in 1924.

They continue to grow strong within this industry with the Tempra Plus model. This model, for example, comes with electronics, a single flow sensor design, advanced flow control, and a hinged cover that allows for easier access to the unit.

10. Mary Heater Corp

Mary Heater Corp

This company uses a combination of smart technology and digital panels that will automatically set the water output to the temperature you want. Its energy efficiency can also save you up to 60% of your electric bill and is ideal for larger homes and households.

They have been providing consumers with energy-efficient hot water solutions since 1955 and continue to grow and guarantee satisfaction within their field.

Bottom Line

When asked which of these brands is considered the best when it comes to tankless water heaters, the answers are never the same. The right brand comes down to your home, the type of water heater you are going to purchase, your geographic location, your budget, and the space you have available.

The best tankless hot water heater reviews can help you to determine which brand and model will best suit your needs. Find the model which fits within your budget and make the decision to upgrade today.

We have comprehensive reviews and a buying guide here.

Tankless Water Heater FAQ

What is a tankless water heater?

These water heaters are also often referred to as instantaneous, instant flow, on-demand water heaters, and instant-on water heaters because they immediately heat the water as it flows through. No water is retained except for what is in the heat exchanger coil, so you don’t have to have gallons and gallons of hot water saved up in a tank for a few hot showers. They are beneficial for larger households with higher hot water usage and consumption. 

What are some of the benefits of using a tankless water heater in my home?

These devices heat the water when you turn on the faucet, and this helps eliminate the additional costs of keeping several gallons of hot water in a storage tank. Ultimately, it also saves you energy as well. They also have a much longer lifespan than conventional tank water heaters. 

Will one tankless water heater be able to heat the entire house?

Yes. Even if you are in a colder climate, you will find that just one high-quality unit from the brands listed above will be sufficient enough to provide hot water for whole-house heating. 

Can I have a tankless water heater if I live in a higher altitude?

At altitudes of over 4000 feet, you will find that a gas tankless water heater will not function as well and can even lose up to 4% of its BTU for every 1000 feet about this listed height. Electric units, on the other hand, are not affected by the altitude. 

What is an on-demand water heater?

On-demand water heatersare also known as tankless water heaters. When the hot water tap is turned on, the cold water travels through the pipes, and then a gas or electric element heats the water. This allows for a continuous hot water supply.

Is a tankless water heater energy efficient?

An electric water heater is considered to be more energy-efficient than a gas water heater. However, it may take a while before you can really identify the energy efficiency and savings.

What heating elements are used in a tankless water heater?

Tankless water heaters heat the water as it flows through the device. The only water that is retained in the device is what is in the heat exchanger coil. There are different types of tankless water heaters including gas and electric models. Gas heaters are energy star rated and use secondary heat exchangers to make them more energy-efficient. Electric models use electricity as their primary heating element.

What is the flow rate of a water heater?

The flow rate of a tankless water heater is typically measured in gallons per minute, and this is also based on a given heat rise of approximately 25 or 50 degrees Fahrenheit.

How much is the installation of a tankless water heater?

The costs involved in water heater installation can vary depending on a number of factors, including what kind of plumbing is needed, what kind of venting is needed, and if you have a dedicated power source.

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