Rheem PROG50-38U RH62 EC1*

The 264 therms figure is computed by this site, not published by 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 unit the UEF is 0.64, taken from the DOE CCD as retrieved on 2026-09-19. The result holds only at that test draw. A household that draws a different amount of hot water will use a different amount of gas, and this page does not give that amount. The full steps are set out in how this site calculates annual energy and running cost.

The high draw pattern stands for a larger household, or a home where showers and laundry overlap. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons. Its rated volume is 48 gallons. The 264 therms figure applies to homes whose daily use resembles that pattern. For a smaller household with lighter use, the figure does not describe that home, and no lower-draw figure is available here. Readers comparing units outside this class can filter water heaters by fuel, space and size.

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, and the running cost calculator for your own ZIP applies that rate to the same 264 therms. Within its class, the unit ranks 236th for lowest energy use of 414. Any cost gap against the 260 therms median follows from the 4 therms difference at your rate; this text does not estimate it. The installed-cost range sits in its own block, with its source and date, as a modeled range rather than a quote. To check a unit in the same class, see same-class replacements by model number.