Skip to main content
Clean Heating and Cooling  |  Tankless Hot Water  |  Manufacturers of tankless hot water

Manufacturers of tankless hot water

Last updated 11/8/2019

Some of the companies selling tankless water heaters today will likely sound familiar to you: manufacturers like Rheem and Rinnai also make many other home appliance products, from heat pumps to refrigerators to dishwashers and more.

4 top tankless water heater manufacturers

There are several companies making tankless water heaters today. As with any major purchase, it’s important to do your research before making a decision and to speak with qualified contractors to ensure you’re getting the best water heater for your needs.


Rinnai is a Japanese company that makes a variety of home products, including tankless water heaters. Their products only run off of gas, and they offer unique hybrid products that combine aspects of tankless and tank systems. Their products are anywhere from 79 percent to 97 percent efficient.

AO Smith

AO Smith is an American water heater manufacturer offering gas-powered and electric tankless hot water models. They offer both point-of-use and whole-home on-demand heaters in varying sizes and efficiencies. Additionally, they have a wide selection of ENERGY STAR qualified tankless water heaters, meaning they meet U.S. Environmental Protection Agency (EPA) standards for environmentally conscious products.


Another manufacturer offering both gas-powered and electric tankless hot water heaters, Rheem is one of the largest manufacturers of water heating products in the U.S. They were founded in 1925 in California and have ambitious company sustainability goals.


EcoSmart offers a suite of energy-efficient water heating devices, from tankless water heaters in gas and electric versions to pool heaters and unique specialty point-of-use showerheads. Their products are some of the least expensive and compact models on the market.

See solar prices near you.

Enter your zip code to find out what typical solar installations cost in your neighborhood.