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Energy Efficient Water Heaters

The Energy Factor of a water heater refers to its efficiency when run under standardized conditions for a 24-hour period. Expressed as a decimal, the Energy Factor is determined by running a Department of Energy specified simulated use test. When compared to standard products of the same fuel type, a water heater with a higher Energy Factor rating uses less energy, resulting in both energy and monetary savings.

First Hour Rating

The First Hour Rating (FHR) in gallons, is determined by running a Department of Energy-specified test with the average water temperature in the tank set to 135°F (+/- 5°F). A draw of three gallons per minute starts and then discontinues once the hot water outlet temperature drops 25°F. The water heater is then allowed to recover back to the 135°F setting and the process continues repeatedly until one hour elapses. The sum of the amount of hot water drawn during the test is the First Hour Rating

National Average Energy Costs

$0.1200 Cost per kWh. (Electric)

$1.0900 Cost Per Therm. (Nat. Gas)

$2.4100 Cost Per Gal. (Propane Gas)

Information Supplied by the Air Conditioning, Heating and Refrigeration Institute and Bradford White.

The Energy Factor Chart is subject to change without notice in accordance with our policy of continuous improvement.

The ratings documented on this chart are also listed at

For FTC guide information, please visit