Richmond PROG50S-36N RH67 PV

The 242 therms figure is computed by this site, not taken from 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 pattern. For this model, the UEF is 0.7. The source is DOE's Compliance Certification Database, retrieved 2026-09-19. Because the figure assumes the federal test's daily draw, it holds only at that draw. A household using a different amount of hot water will use a different amount of gas, and that amount is not available here. Within its class, this model sits in the lowest quarter for energy use. The steps behind the figure are set out in 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 whose daily use matches the high pattern is the case the 242 therms figure describes. A smaller household drawing less hot water each day sits outside that test condition. The registry gives no energy figure for this model at a lower draw, so that use is unknown. The class comparison also covers only gas tanks tested at the high pattern. Other gas tanks at that pattern can be checked with a same-class replacement search by model number.

The running cost is not stated in this text. It depends on the average residential gas price in the reader's state, so the page computes it from the reader's ZIP. The input for that calculation is the 242 therms figure at the high draw pattern. The 18 therms gap to the class median becomes a cost gap only once a gas price is applied. The cost calculator on your own ZIP applies your state's rate to this model's energy use. The installed price range appears in its own block on this page, with its source and date. That range is a modeled installed-cost range for this class, not a quote for this PROG50S-36N RH67 PV unit.