FRIEDRICH PROG40-40N RH62

The figure of 256 therms is a computed value, not a metered one. This site derives it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.66 for this model, and from the DOE test's daily hot-water draw for the high draw pattern. The fuel is natural gas, and the source is DOE CCD, retrieved 2026-09-19. The comparison group is the 414 models registered as a gas tank at the high draw pattern, with a median of 260 therms. This model is 4 therms below that median. It ranks 192nd lowest in energy use of 414, in the second-lowest quarter of its class. The steps of the calculation are on the methodology page.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The figure of 256 therms applies only to that pattern. Energy use at other draw patterns is not available on this page and should not be inferred from it. A household with lower daily demand belongs to a different class, so the class median of 260 therms would not be the right comparison for it. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons, and the rated volume is 38 gallons. The energy figure does not show supply in a busy hour, so check the first hour rating separately. The water heater selector filters by fuel, space and size.

The running cost is not stated in this text because it depends on your state's average residential gas price. The page computes it from your ZIP, using 256 therms as the input. The gap of 4 therms to the class median of 260 therms is a difference in gas use at the high draw pattern; it is not a cost difference until your own rate is applied. The cost calculator does that step. The modeled installed-cost range appears in its own block with its source and date. It is a modeled range, not a quote. To look for a unit in the same class, you can find a same-class replacement by entering PROG40-40N RH62.