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 Tank Water Heaters
A. O. Smith’s family of natural gas and liquid propane tank water heaters consists of various models ranging from high-efficiency ENERGY STAR® certified water heaters to economical standard efficiency gas water heaters. Browse our gas tank water heater line to find the model for your home.
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
Benefits of Gas Tank Water Heaters
A. O. Smith gas water heaters are easy to install and with a variety of venting options, we have models to fit any home. A. O. Smith strongly recommends that you consult a professional installer.
Hot Water Storage Supply
Tank water heaters store a supply of hot water, making it available when you need it most.
A. O. Smith gas water heaters are built to last with limited warranties that range from 6 to 10 years to ensure that your home has hot water for years to come.
How it Works
A. O. Smith gas water heaters heat water by burning either natural gas or LP (liquid propane). All models have a thermostat/gas control to set the desired temperature. When a hot water fixture is opened, hot water flows out of the tank and through hot water lines in the home and the tank is refilled with cold water. The thermostat monitors the water temperature and initiates reheating when needed. Standard gas models have a standing pilot light, and when the thermostat calls for operation gas flows to the burner where it is lit by the pilot light. High-efficiency models utilize an electronic gas valve and use a spark or hot surface ignitor so a standing pilot is not required. Standard gas models have a standing pilot light, and when the thermostat calls for operation gas flows to the burner where it is lit by the pilot light. When the desired water temperature is reached in the tank, the main gas valve shuts off and the heating process stops.
However, exhaust gasses are created by the heating process. These exhaust gasses need to be vented to the outdoors, and different styles of gas heaters have different venting requirements. A plumbing contractor can assist you in choosing a water heater that fits your needs and the ventilation capabilities in your home. You can also use the A. O. Smith online XPERT™ Product Selector to help determine which water heater is the best fit for your home.
All A. O. Smith gas tank water heaters feature innovative technology to improve durability. Many tanks are lined with a glass coating to protect the steel tank from the corrosive effects of water. These tanks incorporate an anode rod that protects and neutralizes harmful elements from damaging the glass lining and steel tank. The inclusion of a temperature and pressure relief valve acts as a safety device to detect and relieve internal temperature or pressure if the tank exceeds specified limits. These components assist in providing high-quality and reliable operation.
Still Have Questions?
*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 Tank Water Heaters
- 40,000 BTU input
- 81-gallon first hour rating
- 6-Year Warranty
- 97-gallon first hour rating
- 6-Year Warranty
- ENERGY STAR® certified
- 100-gallon first hour rating
- 6-Year Warranty
- 175,00 BTU input
- 222-gallon recovery rate
- 10-Year Warranty
High-Efficiency Condensing Gas Tank Water Heaters
Discover our line of high-efficiency condensing gas tank water heaters that are engineered with energy efficiency in mind.
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.
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.