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Residential Gas Tank & Tankless Water Heaters
The complete A. O. Smith line of natural gas and liquid propane water heaters consists of over 150 different models. From high-efficiency ENERGY STAR® certified water heaters to economical standard efficiency gas water heaters, A. O. Smith has the gas water heater to fit your needs
A. O. Smith Receives 2025 Silver Edison Award for Sustainable Consumer Product Innovation Learn More >
Introducing the Adapt™ Gas Tankless Family
In 2010, A. O. Smith introduced its full line of natural gas and propane tankless water heaters that continue to be an innovative part of the full A. O. Smith product family today. Engineered to deliver continuous hot water when you need it, propane and natural gas tankless water heaters are easily installed in tight spaces, including closets, bathrooms and even outdoors in appropriate climates.
Adapt™ NC (Non-Condensing)
Hot water only when needed with on-demand tankless
Zero yearly descaling with integrated X3® Scale Prevention Technology
Copper Heat Exchanger
Adapt™ SC (Standard Condensing)
Hot water only when needed with on-demand tankless
Zero yearly descaling with integrated X3® Scale Prevention Technology
Dual copper & stainless steel heat exchangers
ENERGY STAR® Certified with up to .95 UEF
Save on installation with rebates & tax incentives
Adapt™+ Premium Condensing
Hot water only when needed with on-demand tankless
Zero yearly descaling with integrated X3® Scale Prevention Technology
Dual heavy-duty stainless steel heat exchangers
ENERGY STAR® Certified with up to .95 UEF
Save on installation with rebates & tax incentives
Instant hot water with integrated recirculation pump
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X3® Scale Prevention Technology
Prevent scale build-up to reduce regular maintenance and extend the life of your water heater by up to 300%.
Rebates & Tax Credits
Rebate and incentive programs provide savings to consumers for the purchase of water heaters that meet certain energy efficiency standards.
Need Help From A Pro?
A. O. Smith water heaters are professionally installed by local independent contractors.
What Our Customers Are Saying
- 199,000 BTU input
- 15-Year Warranty
“I love not having to worry about running out of hot water."
- 199,000 BTU input
- 15-Year Warranty
“Endless hot water supply has made our entire family happy!�?
Benefits of Gas Tankless Water Heaters
Continuous Hot Water
Gas tankless water heaters give you continuous hot water on demand. When paired with a recirculation pump, they provide guaranteed instant hot water.
Space Savings
A. O. Smith’s natural gas and propane tankless water heaters can be mounted inside or outside (depending on your region) to save space within your home.
Energy Savings
Gas tankless water heaters only heat your water when you need it, which can reduce energy costs. Paired with A. O. Smith’s 15-year tankless limited warranty, gas tankless models can be a smart, money-saving solution for your home.
How it Works
When a natural gas tankless water heater or propane tankless water heater is installed in your home, it is attached directly to the water line to deliver on-demand hot water. When you open a hot water tap, the water flow sensor within your water heater is triggered and the burner is activated. The water within your system begins to circulate through the heat exchanger, heating your water to the designated temperature and providing you with continuous hot water. Once you turn off your water tap, the unit shuts down to save energy.
Still Have Questions?
Tankless water heaters have different flow rates measured in gallons per minute (GPM), which indicate the amount of water they can deliver at a time. Because these water heaters don't maintain a supply of hot water in a tank, you need to choose an appropriately sized tankless model based on household needs. The ideal output rate for your home depends on the number of people in the residence, the appliances you use, and the original temperature of the water being heated. Some people install more than one tankless water heater based on their requirements. Check out our water heater selector to help choose the best water heater for your needs.
- What do I need?
- Before installation, you will need to determine the incoming ground water temperature, the ideal location in your home, and the correct water heater size required for your needs.
- Where to install?
- A tankless water heater can be installed anywhere in your home with the correct piping—closets, garage, bathrooms, etc. In warmer climates where there is no risk of freezing, a tankless water heater may be installed on the exterior of the home to save on interior space.
Product Comparison
*Many factors affect the actual performance of a water heater. This represents our closest approximation of your likely experience with this water heater in your local area, but actual performance may vary depending on factors beyond our ability to control or estimate.
Find A Local Water Heater Pro
A. O. Smith water heaters are professionally installed by local independent contractors.
Featured Gas Tankless Water Heaters
- ENERGY STAR® certified (0.95 UEF)
- 199,000 BTU input
- 15-Year Warranty
- ENERGY STAR® certified (0.95 UEF)
- 180,000 BTU input
- 15-Year Warranty
- ENERGY STAR® certified (0.95 UEF)
- 160,000 BTU input
- 15-Year Warranty
High-Efficiency Condensing Gas Tankless Water Heaters
Learn more about A. O. Smith’s full line of high-efficiency condensing gas tankless water heaters.
Non-Condensing Gas Tankless Water Heaters
Learn more about A. O. Smith’s full line of non-condensing gas tankless water heaters.
Water Heater Selector Quiz
Interested in Learning More?
*Gas water heaters with UEF of 0.82 or higher OR with a thermal efficiency of at least 90%. Local utility rebates available in limited geographical areas. For information on the Federal Tax Credit, go to: energystar.gov. Check with your tax advisor for applicability. Offer details and expiration may vary. See Rebate Center for details.
Why A. O. Smith?
A. O. Smith is a leading manufacturer of both residential and commercial water heating technologies, including the #1 most specified commercial water heater.
For more than 145 years, we’ve developed state-of-the art products that push new boundaries and improve the lives of our customers.
We combine cutting-edge technology with committed people who take pride in providing the very best support for our customers.
Our products are put through rigorous quality and endurance testing so now matter where hot water is needed, A. O. Smith can provide a solution you can count on.