Ruud PROG40-38U RH62 EC1*

The 191 therms figure does not appear in the registry itself. This site computed it from the model's UEF, the ratio of hot water delivered to energy used. For this model, the UEF is 0.58. The calculation combines that ratio with the daily hot-water draw that the DOE test sets for the medium draw pattern. The UEF comes from the DOE Compliance Certification Database, retrieved 2026-09-19. The figure therefore holds only at the federal test's daily draw. A household that draws more or less hot water than the test assumes will use a different amount of gas. The steps and inputs are set out in the method behind the annual energy and cost figures.

Among the 288 gas tank models at the medium draw pattern, this model ranks 231st for lowest energy use. That places it among the higher energy users in its class, 6 therms a year above the class median at the test's draw. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 71 gallons. Its rated volume is 38 gallons. The medium draw pattern stands for a typical household's daily use, so the energy figure fits a home of that kind. For a home with heavier daily use, this data gives no figure, because the model's energy use at other draw patterns is not available here. To check other registered models in the same class, use a same-class replacement search by model number.

The text of this page states no running cost for the Ruud PROG40-38U RH62 EC1*. That cost depends on your state's average residential gas price. The page computes it from your ZIP and applies that rate to the 191 therms figure, at the test's daily draw. The 6 therms gap to the class median is priced the same way, at your rate rather than a fixed one. You can run the numbers again in the running-cost calculator for your own ZIP. The installed price range sits in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote.