Rheem PROG50-34U RH EC1

This site computed the 269 therms figure; the registry does not list it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, and the daily hot-water draw in the DOE test for the high draw pattern. This model's UEF is 0.63. The registry values come from the DOE Compliance Certification Database, retrieved 2026-09-19. This unit ranks 320th lowest for energy use among the 414 models in its class. That puts it in the highest quarter of its class for energy use. The figure applies only at the test's daily draw, so a household that uses more or less hot water will have a different total. The steps are set out in how the annual energy and cost figures are calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. At that pattern, this model lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 80 gallons. Its rated volume is 48 gallons. If you are a plumber or seller confirming a match, compare these two ratings with those of the unit being replaced. You can list other models registered in the same class with a same-class replacement search by model number. The registry does not report how this unit performs outside the federal test, so that information is not available here.

The running cost is not given in this text. It depends on your state's average residential gas price, so the page calculates it from your ZIP. You can check it in the water heater cost calculator for your ZIP. At any gas price, the 9 therms gap to the class median shown above means more gas used each year at the test's draw. This figure does not describe a household that does not match the high draw pattern, such as a smaller one with fewer overlapping draws. For a different fuel, space or size, the selector by fuel, space and size covers other classes. The installed-cost range appears in its own block, with its source and date. It is a modeled range, not a quote.