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
Residential Gas Tankless Water Heaters
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.
Condensing Gas Tankless Water Heaters with X3®
Our Gas Tankless Water Heaters with X3® Scale Prevention Technology require no scale related maintenance, and offer three times longer life compared to standard tankless.
Rebates & Tax Credits
Up to $850 in Local Utility Rebates may be available in your area!
What Our Customers Are Saying
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.
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.
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?
- 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.
*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
- 199,000 BTU input
- 15-Year Warranty
- ENERGY STAR® certified
- 180,000 BTU input
- 15-Year Warranty
- Endless Hot Water
- 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.
Not sure which product is right for you?
Take our water heater selector quiz to find the correct water heater for your home.
Interested in Learning More?
Gas water heaters require venting upon installation. Learn more about how to choose the correct vent type for your home.
How Water Quality Affects Water Heaters
How can the quality of your water affect your water heater? Get tips and more information on water hardness, why it matters, and how to solve it.
Why Water Heater Size Matters
Consider what size of water heater is best for your needs. Review the factors you’ll need to weigh before making a decision.
Water Heaters and Safety
Discover the innovative design features A. O. Smith engineers use to keep your water heater both functional and safe for everyday use.
*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.