Ruud 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 draw pattern. For this model the registry lists a UEF of 0.7. Among the 414 gas tank models at the high draw pattern, it ranks 90th lowest in energy use. The class median is 260 therms, so this unit uses 18 therms less per year under the same test draw. The figure holds only at that test draw. The steps are set out in how the annual cost is calculated. Source: DOE CCD, retrieved 2026-09-19.

The high draw pattern stands for a larger household, or a household where showers and laundry overlap. For that use, the registry lists a rated volume of 48 gallons for this model. It also lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 78 gallons. A household that draws much less or much more hot water than the test assumes will not match the 242 therms figure. How this model's energy use changes at other draw levels is not available in this data. To check other gas tank models registered at the high draw pattern, use find a same-class replacement by model number.

This page does not state a running cost in the text. Running cost depends on your state's average residential gas price. The page therefore computes it from your ZIP in the cost calculator on your own ZIP. That calculation starts from the same 242 therms at the high draw pattern. At any given gas price, a model 18 therms below the 260 therms class median costs less to run than the median model. How much less depends on your own rate, which this text does not know. The installed-cost range sits in its own block, with its source and date. It is a modeled range, not a quote. Local installed prices for your address are not available in this data.