Rheem PROG50S-36N RH67 PV

The 242 therms figure is calculated by this site. The registry does not publish it. The calculation uses the model's UEF, the ratio of hot water delivered to energy used, of 0.7. It combines that UEF with the DOE test's daily hot-water draw for the high draw pattern. The UEF comes from the DOE CCD, retrieved 2026-09-19. A household that draws more or less hot water than the test will use a different amount of gas. This model ranks 90th lowest in energy use among the 414 models registered as a gas tank at the high draw pattern. That rank puts it in the lowest quarter of its class. The steps behind the figure are on the page about 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 78 gallons. Its rated volume is 48 gallons. A home that needs more than 78 gallons in its busiest hour asks for more than this rating covers. The registry does not say how the unit performs beyond that point. A smaller household would use a different amount of gas than 242 therms. That amount is not available in this data. To compare other units by fuel, space and size, use the water heater selector. To match this unit within its class, find a same-class replacement 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 calculates it from your ZIP. The calculation applies your state's rate to the 242 therms figure at the high draw pattern. The same rate applies to the 18 therms gap between this model and the class median of 260 therms. Enter your ZIP in the cost calculator for your own rate to see the result. The installed price appears in its own block with its source and date. It is a modeled range, not a quote, and this text does not restate its figures.