Ruud PROG50-40N RH62

This site computes the 260 therms figure; the registry does not publish it. The calculation combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that the DOE test sets for the high draw pattern. This model's UEF is 0.65, from DOE CCD data retrieved 2026-09-19. The figure holds only at that test draw. A household drawing more or less hot water each day would use a different amount, and the data does not say how much. Among the gas tank models registered at the high draw pattern, this unit ranks 204th lowest for energy use. That places it in the second-lowest quarter of its class. The method is set out in how the annual energy and cost figures are calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 260 therms figure is most relevant to a household of that kind. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 76 gallons. Its rated volume is 48 gallons. A household that needs more than 76 gallons in its busiest hour asks more than this rating states. The data does not show how the unit performs beyond that point. A smaller household with lighter daily use sits outside the high draw pattern, so this energy figure does not describe its use either. To compare other models in the same class, use find a same-class replacement by model number.

The text on this page does not state a running cost. The cost of 260 therms of natural gas depends on your state's average residential gas price. For that reason, the page computes the cost from your ZIP rather than from a national figure. Two readers in different states can see different costs for this model and the same energy figure. An estimate written here would not reflect your rate, so none is given. The computed cost carries the same condition as the energy figure: it applies at the test's daily draw for the high draw pattern. To run it for a specific address, use the water heater cost calculator for your ZIP. The installed price range appears in its own block, with its source and date, as a modeled range rather than a quote.