FRIEDRICH PROG40S-40N RH62

The 191 therms figure is calculated by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.58 with the DOE test's daily hot-water draw for the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. The class median for the 288 models registered as a gas tank at this draw pattern is 185 therms. This unit sits 6 therms above that median. It ranks 231st lowest in energy use, which places it in the highest quarter of its class for energy use. The comparison holds at the test draw only, so it describes the registered rating and not a measured home.

Because the figure belongs to the medium draw pattern, it fits a household whose hot-water use resembles that test: a typical family with a busy morning. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 66 gallons, and the rated volume is 39 gallons. Someone who wants the lowest energy use in this class will find this unit 231st lowest of 288. The water heater selector by fuel, space and size can narrow other options. For a household with a much larger or smaller daily draw, the 191 therms does not apply, and annual energy at other draw patterns is not available on this page. To compare like with like, find a same-class replacement by model number.

Running cost is not written in the text because it depends on your state's average residential gas price. Multiplying 191 therms of natural gas by that price gives the yearly cost at the medium draw pattern. The cost calculator on your own ZIP does this for you, and how the annual cost is calculated sets out the method. The 6 therms gap to the class median of 185 therms is an energy difference; its cost depends on the price you enter. The modeled installed-cost range appears in its own block with its source and date. It is not a quote and is not repeated here. Energy use in your own home is not available from the registry.