High Efficiency Condensing and Non-Condensing Gas Tankless Water Heaters
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 High-Efficiency Condensing Gas Tankless Water Heaters
A. O. Smith's condensing natural gas and propane tankless water heaters are highly efficient. Available in both indoor and outdoor configurations, A. O. Smith's tankless models pair high efficiency with groundbreaking designs.
ADAPT ABILITY
Ultra Flexible. Fewer Trips. More Savings.
Introducing the new Adapt™ Premium Condensing Gas Tankless Water Heaters with X3® Scale Prevention Technology.
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
- 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
“Bought this unit to replace another unit from a different manufacturer. Wish I went with A O Smith to start with."
- 4,500-watt elements
- 48-gallon first hour rating
- 10-Year Warranty
“Great unit – provides plenty of hot water for the family."
Benefits of Condensing Gas Tankless Water Heaters
Continuous Hot Water
Condensing gas tankless water heaters produce continuous, on-demand hot water for your home and can provide instant hot water when the model includes a recirculation pump.
Space Savings
A. O. Smith’s condensing tankless water heaters can be mounted in small or tight places both inside and outside of your home to better utilize and save space.
Energy Savings
Condensing tankless water heaters utilize the residual heat from the exhaust gases to make hot water. That higher efficiency operation means lower operating costs and energy savings.
How it Works
A condensing tankless water heater saves space and supplies continuous hot water for your home, but what separates a condensing unit from a non-condensing unit is its ability to utilize excess heat efficiently by using a second heat exchanger that increases the efficiency and produces more hot water. Because tankless water heaters do not store their water supply within a tank, water is heated rapidly when the water runs through the heat exchanger within the tankless unit. Condensation is formed when you use a second heat exchanger to capture and cool what would otherwise be wasted heat. This process of utilizing the excess heat rather than venting it out of the heater allows your condensing tankless unit to conserve more energy, resulting in a Uniform Energy Factor (UEF) of over 0.90 and producing more hot water than non-condensing tankless heaters. Paired with a 15-year limited warranty, an
A. O. Smith condensing tankless water heaters can provide years of hot water for your home.
Still Have Questions?
Our tankless water heaters come with a competitive 15 year limited warranty. Life of a unit may depend on your incoming water quality, usage, and maintenance. Hard water can leave mineral deposits on the heat exchanger and reduce its efficiency. You can extend the life of a condensing tankless water heater through regular maintenance and servicing, which includes cleaning and replacing filters, checking the burners and flushing mineral buildup. Many new A. O. Smith condensing gas tankless water heaters come with X3® Scale Prevention Technology that eliminates the need for regular descaling and extends the unit’s life up to three times.
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 Condensing 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
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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.