FRIEDRICH PROG50S-40U RH60 EC1*

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.63 for this model. This site combined that UEF with the DOE test's daily hot-water draw for the high draw pattern, which gives 269 therms of natural gas a year. The registry does not publish that annual figure itself. The site computed it from DOE CCD data retrieved 2026-09-19. The figure applies only at the federal test's draw, so a home that draws more or less hot water will use a different amount, and that amount is not available here. The steps behind the calculation are set out on the methodology for the annual cost page.

This model is compared with the 414 models registered as a gas tank at the high draw pattern. Its energy use ranks 320th lowest of 414, which puts it in the highest quarter of its class for energy use. Its 269 therms is 9 therms above the class median of 260 therms. The high draw pattern describes a larger household, or one where showers and laundry overlap. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 85 gallons, and the rated volume is 48 gallons. A reader whose priority is lower gas use will find other models in this class below the median. A same-class replacement by model number can be looked up for comparison.

The running cost is not written in the text because it depends on your state's average residential gas price. The page computes it from your ZIP, applied to the 269 therms at the high draw pattern. The same rate also sets what the 9 therms gap above the 260 therms class median costs over a year. Enter your ZIP in the cost calculator for your own rate to see both. The installed price range appears in its own block on this page, with its source and date. It is a modeled range, not a quote, and it is not repeated here.