Gas Tank Water Heaters

Our most extensive product line available in both natural gas and liquid propane

The complete A. O. Smith line of natural gas and liquid propane tank water heaters consists of over 150 different models. From high-efficiency ENERGY STAR® qualified water heaters to economical standard efficiency gas water heaters, A. O. Smith has the gas tank water heater to fit your needs

Benefits of Gas Tank Water Heaters

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    Easy Installation

    A. O. Smith gas tank water heaters are easy to install, and we offer multiple venting options models to fit any home. A. O. Smith strongly recommends that you consult a professional installer

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    Hot Water Storage Supply

    Tank water heaters store a supply of hot water, making it available when you need it most.

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    Long Lasting

    A. O. Smith gas tank 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.

A Closer Look

Diagram of the interior of a tankless water heater.

How Do Gas Tank Water Heaters Work?

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 gases are created by the heating process. These exhaust gases 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.

There are benefits to both electric tank and gas tank water heaters, but changing the fuel type of your home can result in higher initial costs. If you are building a new home, you should consult with your local plumbing contractor to assist in choosing your fuel source and this will help in choosing the correct water heater.

Natural gas is supplied to many homes in the United States by way of underground piping. Liquid Propane (LP) is used mostly in rural areas of the country, where natural gas is not available. LP gas is usually stored in large tanks that sit in your yard. The gas is typically delivered to your home in a tanker truck and pumped into the tank sitting in the yard. Most A. O. Smith gas water heaters are available from the factory in either liquid propane or natural gas. Both fuel sources can provide consistent hot water for your home.

Before purchasing a gas tank water heater you should understand what type of fuel you currently have in your home, how much hot water you use on a daily basis, and where your current water heater is installed. A plumbing contractor can assist in helping you choose a water heater that fits your needs, or you can use A. O. Smith’s online XPERT™ Product Selector to help determine which water heater is best for your home.

A. O. Smith offers many different sizes of natural gas and liquid propane water heaters to meet your home’s needs. Evaluating your happiness with your current hot water within your home will help determine what size of water heater is best for you. Also, understanding where you will be installing your new water heater and how much space you have available will help in deciding what size of water heater you should purchase. Consult our online XPERT™ Product Selector.

While you may be able to install a gas tank water heater by yourself, A. O. Smith strongly recommends that you consult a professional before doing so. Factors such as the proper venting required, managing your home’s fuel line, and removing your old water heater are all reasons to have a local plumber or contractor assist in the installation of your water heater.

High-Efficiency Condensing Gas Tank Water Heaters

Discovery our line of high-efficiency condensing gas tank water heaters that are engineered with energy efficiency in mind.

Learn About High-Efficiency Condensing Gas Tank Water Heaters >
Compare:
Tankless gas water heater

Standard Non-Condensing Gas Tank Water Heaters:

GCR-50

Tank gas water heater

High-Efficiency Condensing Gas Tank Water Heaters:

GDHE-50

Single Shower Length 37 minutes Unlimited
Showers Back-to-Back 4.7 showers Unlimited
Showers at the Same Time 3.2 showers 3.5 showers
Maximum Tub Size 87 gallons 112 gallons
Time to Fill Tub check_circle_outline check_circle_outline
Hot Water Storage Supply check_circle_outline check_circle_outline
UEF 0.62 0.88
Warranty 6 Years 6 Years
*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.
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Contractor Resources

  • Screwdriver and wrench icon.

    Installation Guide

    Download our gas tank waterheater installation instructions.

    View Document
  • Set square icon.

    Resource Guide

    Match the flow rate to your customer’s needs.

    View Document
  • Overlapping arrows icon.

    Cross Reference Tool

    Search for NAECA-compliant replacement options.

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