Rheem PROG40S-34N RH62 *

This site computed the 188 therms figure; the registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that the DOE test sets for the medium draw pattern. For this model the UEF is 0.59. Both inputs come from the DOE Compliance Certification Database, retrieved 2026-09-19. The figure holds only at that test draw. A household that draws more or less hot water each day will use a different amount of gas, and the registry data does not say how much. The page on how the annual figure is calculated sets out each step.

Within its class, the model ranks 186th for lowest energy use among 288 gas tank models at the medium draw pattern. Its gap to the class median is 3 therms, measured at the same test draw as the 188 therms figure. The registry lists a rated volume of 38 gallons and a first hour rating, the gallons of hot water available in the first hour from a full tank, of 65 gallons. That rating is the limit to check against a household's busiest hour. A busiest hour that needs more hot water than 65 gallons is outside what the rating covers. To compare models at the same draw pattern, use the same-class replacement search by model number.

The running cost does not appear in this text. The yearly cost of 188 therms of natural gas depends on your state's average residential gas price, so the page calculates it from your ZIP. Enter it in the cost calculator for your own ZIP. The 3 therms gap to the class median is priced at the same rate, so what that gap costs also depends on your price. The installed price range appears in its own block, with its source and date. It is a modeled range, not a quote. This page has no data on energy use at any draw pattern other than medium.