Rheem XG50S06EC40U1

The 264 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 pattern. This model's UEF is 0.64, from the DOE CCD, retrieved 2026-09-19. The figure holds only at the federal test's draw. A home that uses more or less hot water will burn a different amount of gas. Against its class, the unit ranks 236th for lowest energy use out of 414. That places it in the second-highest quarter of its class for energy use, 4 therms above the 260 therms median. The method behind the annual energy and cost figures sets out each step.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 86 gallons. Its rated volume is 48 gallons. A plumber or seller verifying a quote can check both values against the label on the tank. A home whose peak hour needs more than 86 gallons falls outside what this rating covers. The registry does not report how the unit performs outside the federal test, so field output is not available here. To compare other gas tank models at the same draw pattern, use the same-class replacement search by model number.

The running cost is not stated in this text. It depends on your state's average residential gas price, so the page computes it from your ZIP. The 4 therms gap to the 260 therms median is priced at that same rate, so what the gap costs differs by state. Enter your ZIP in the running cost calculator for your own ZIP to price 264 therms at your rate. The installed price range appears in its own block on this page, with its source and date. It is a modeled range, not a quote. Actual gas use and cost in your home are unknown here, because they depend on your own daily hot-water draw rather than the test's.