Rheem PROG50S-40N RH61

The 269 therms figure is calculated by this site. It is not a number the registry publishes. 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 0.63. The source is the DOE CCD, retrieved 2026-09-19. Because the figure assumes the federal test's draw, it describes the unit under that condition only. A home that uses more or less hot water each day will see a different yearly total. The registry data does not say how far actual household use departs from the test draw, so that gap is unknown here. The method behind the annual energy and cost figures sets out each step of the calculation.

The comparison class is the 414 models registered as a gas tank at the high draw pattern. At the test's draw, their median is 260 therms a year. This model uses 9 therms more than that median. It ranks 320th for lowest energy use among the 414, which puts it in the highest quarter of its class for energy use. The registry lists a rated volume of 48 gallons. It also lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 87 gallons. The high draw pattern stands for a larger household, or one where showers and laundry overlap. Figures at a lower daily draw are not available in the registry data. To compare other units in the same class, you can find a same-class replacement by model number.

This text gives no running cost for the Rheem PROG50S-40N RH61. The cost depends on the average residential gas price in the reader's state. The page calculates it from your ZIP, using 269 therms of natural gas a year at the high draw pattern. The cost calculator for your own ZIP shows that result. The 9 therms gap to the class median follows the same logic. At any gas price, that gap is the extra yearly gas use compared with a median unit in this class, at the test's draw. The installed-cost range on this page has its own block with its source and date. That range is modeled from data and is not a quote. Its figures are not repeated in this text.