Rheem XG50T12HE40U0

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 draw pattern. For this model the UEF is 0.64. The figure holds only at that test draw and does not describe a home whose hot-water use differs from it. The underlying data comes from the DOE Compliance Certification Database (CCD), retrieved 2026-09-19. Among the 414 gas tank models at the high draw pattern, this model ranks 236th lowest in energy use. That places it in the second-highest quarter of its class for energy use. The method is set out on the page explaining how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 77 gallons. Its rated volume is 48 gallons. A household that matches the high pattern is the case the 264 therms figure describes. For a smaller household with lighter use, this model's annual gas use is not available on this page. To compare other units by fuel, space and size, use the water heater selector. To check another gas tank model registered in the same class, search for a same-class replacement by model number.

This page does not state a running cost in the text. The cost depends on your state's average residential gas price, so the page computes it from your ZIP code instead. The figure you see is that price applied to 264 therms a year. A reader in a state with a higher gas price will see a higher figure for the same 264 therms. The 4 therms gap to the class median also becomes a cost gap that depends on the same rate; its size is not given here. The installed price range appears in its own block, with its source and date, as a modeled range rather than a quote. You can work out the cost on your own rate with the cost calculator for your ZIP.