FRIEDRICH PROG50-38N RH60 *

The figure of 264 therms is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.64 with the DOE test's daily hot-water draw for the high draw pattern. The underlying data come from DOE CCD, retrieved 2026-09-19. The figure applies only to that test draw and to natural gas. A household that uses more or less hot water than the test assumes will use different energy. The steps behind the calculation are listed on the page about how the annual cost is calculated.

Among the 414 models registered as a gas tank at the high draw pattern, this model has the 236th lowest energy use of 414. It sits in the second-highest quarter of its class for energy use, 4 therms above the class median of 260 therms. The comparison holds only at the high draw pattern, meaning a larger household, or one where showers and laundry overlap. A household that fits that description can read 264 therms as the registry-based expectation for this unit. A household with a lighter pattern should not treat it as its own figure, and this page has no annual energy for other draw patterns. The selector by fuel, space and size covers those cases.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 85 gallons for this model. Its rated volume is 48 gallons. The annual energy figure of 264 therms is computed from the UEF and the test draw, not from these two values. The running cost is not stated in the text, because it depends on your state average residential gas price. Enter your ZIP in the cost calculator to apply that price to 264 therms. To compare against another unit in the same class, use the page to find a same-class replacement by model number. The modeled installed-cost range appears in its own block, with its source and date, and is not a quote.