Ruud PROG50-38U RH62 EC1*

This site computed the 264 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 DOE test's daily hot-water draw for the high draw pattern. For this model the UEF is 0.64, taken from the DOE CCD on 2026-09-19. The high draw pattern stands for a larger household, or one where showers and laundry overlap. A household that draws a different amount of hot water than the test assumes will not use exactly 264 therms. The registry data does not say how large that gap would be. The method behind the annual cost figure sets out each step of the calculation.

Among the 414 gas tank models at the high draw pattern, this one ranks 236th for lowest energy use. That places it in the second-highest quarter of its class for energy use. The gap to the 260 therms median is 4 therms a year, at the test's daily draw. 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 84 gallons. A listing that gives different values for PROG50-38U RH62 EC1* does not match this registry record. To compare it with other units in the same class, use the same-class replacement search by model number.

The text on this page gives no running cost. The cost of 264 therms of natural gas depends on your state's average residential gas price. For that reason, the page works out the cost from your ZIP. The cost calculator for your own ZIP applies that rate to this model's annual use. The installed price appears in a separate block, with its source and date, as a modeled range and not a quote. For a household smaller than the high draw pattern describes, the 264 therms figure and the 236th rank are not a direct match. This page has no figure for another draw pattern. If you need a different fuel, space or size, start from the selector by fuel, space and size.