Ruud PROG50S-40N RH61

The 269 therms figure is computed by this site, not published by the registry. It combines the model'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. The registry lists a UEF of 0.63 for this model, from the DOE CCD, retrieved 2026-09-19. Among the 414 gas tank models at the same pattern, it ranks 320th lowest in energy use. That places it in the highest quarter of its class for energy use. A household drawing more or less hot water than the test's daily draw will use a different annual amount. The inputs and steps 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. For that use, the registry gives a first hour rating, the gallons of hot water available in the first hour from a full tank, of 87 gallons. The rated volume is 48 gallons. Both figures describe capacity under federal test conditions, not results in a particular home. A household with a lighter daily draw falls outside the pattern this model was tested at. For that household, the 269 therms figure does not describe its use. Anyone comparing gas use within the class should note the 9 therms gap above the 260 therms median. Other models in the same class can be checked with find a same-class replacement by model number.

This page does not give a running cost in the text. The cost of 269 therms a year depends on the average residential gas price in the reader's state. The page calculates it from the reader's ZIP, and no amount is estimated here. The same applies to the 9 therms gap above the class median, because its cost also depends on the local rate. The installed price range appears in its own block, with its source and date, as a modeled range rather than a quote. To apply the 269 therms figure to your own rate, use the cost calculator on your own ZIP. This unit's actual gas use in a specific home is not in the registry and is not available.