High-Efficiency Condensing and Non-Condensing 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.
Residential Non-Condensing Gas Tankless Water Heaters
A. O. Smith’s non-condensing gas and propane tankless water heaters provide endless hot water for your home. All non-condensing tankless water heaters from A. O. Smith offer a water heating solution that is built to last.
Water Heater Rebates & Tax Credits
Up to $850 in Local Utility Rebates may be available in your area!
*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.
What Our Customers Are Saying
- Endless Hot Water
- 199,000 BTU input
- 15-Year Warranty
“This unit is replacing a similar tankless unit. The install was very straightforward and has been working flawlessly since I installed it. Well built unit!�?
- Endless Hot Water
- 199,000 BTU input
- 15-Year Warranty
“Great unit! I would recommend it to anyone. Reputable brand�?
- Endless Hot Water
- 140,000 BTU input
- 15-Year Warranty
“We have installed many of the A. O. Smith tankless models – all have been great�?
Benefits of Non-Condensing Gas Tankless Water Heaters
Continuous Hot Water
Non-condensing tankless water heaters produce continuous, on-demand hot water for your home and can provide instant hot water through the installation of an accessory hot water recirculation pump.
Space Savings
A. O. Smith’s non-condensing tankless water heaters can be mounted in small or tight spaces, either inside or outside of your home, to better utilize and save space.
Energy Savings
Non-condensing tankless water heaters vent away the excess heat produced during the heat exchange process, causing less corrosion and deterioration of the water heater and resulting in a longer life span.
How it Works
An A. O. Smith non-condensing tankless water heater saves space and supplies continuous hot water for your home. Non-condensing technology utilizes a single heat exchanger to heat the water to the desired temperature. Water flows through a heat exchanger where it is heated to the desired temperature by the hot exhaust gasses. The excess heat that is not transferred to the water is expelled through the exhaust venting. This exhaust is higher temperature than on a condensing tankless heater to lessen the risk of corrosion. However, non-condensing heaters generally require metal exhaust venting to withstand the higher temperatures. Paired with a 15-year limited warranty, an A. O. Smith non-condensing tankless water heater can provide years of hot water for your home.
Still Have Questions?
A non-condensing tankless water heater is a compact water heater without a tank. It heats water only when demanded by appliances and hot water faucets. Cold water passes through a heat exchanger, which heats it to the desired temperature by hot exhaust gasses. It then releases unused heat through ventilation. By comparison, a condensing tankless water heater has two heat exchangers. The second one improves energy efficiency by capturing and recycling unused heat instead of venting it right away. Learn about high efficiency condensing tankless.
How do I keep my tankless water heater from freezing?
All A. O. Smith tankless hot water heaters have built-in freeze protection. However, if the heater is installed outdoors, during a power outage you will need to drain the water from the unit to prevent freezing.
Does a non-condensing tankless water heater require a drip pan?
Use a drip pan with your tankless water heater as a precaution. This protects your home from water damage and mold should the water heater leak. Because tankless models don't have storage tanks, a drain pan should be enough to contain any leakage.
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.
Get it installed by a Local Pro
A. O. Smith water heaters are available through your local plumbing professional.
Featured Non-Condensing Gas Tankless Water Heaters
- Endless Hot Water
- 140,000 BTU input
- 15-Year Warranty
- Endless Hot Water
- 190,000 BTU input
- 15-Year Warranty
- Endless Hot Water
- 199,000 BTU input
- 15-Year Warranty
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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.