Ruud PROG40-40N RH67 PV

The 242 therms figure is computed by this site, not taken from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. For this model the UEF is 0.7. The source is the DOE CCD, retrieved 2026-09-19. Among the 414 models registered as a gas tank at the high draw pattern, this model ranks 90th lowest in energy use. That places it in the lowest quarter of its class. The figure holds only at the federal test's daily draw. Energy use at a different daily draw is not available from this data.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 79 gallons. Its rated volume is 38 gallons. Those figures belong to the high-draw test condition. For a home with lighter daily use, this data gives no annual energy figure, so a comparison at that draw is not available. To compare models sized for other demand, the selector by fuel, space and size filters by those factors. To check a like-for-like swap, you can find a same-class replacement by model number.

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 instead. The cost calculator on your own ZIP prices the 242 therms a year at that rate. At any single rate, the 18 therms gap to the 260 therms class median becomes a cost gap at that same rate; that amount is not stated here. How the annual cost is calculated sets out the steps and sources. The installed price range sits in its own block, with its source and date, as a modeled range rather than a quote.