FRIEDRICH PROG40-40N RH67 PV

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.7 for this model. This site computed 242 therms a year from that UEF and the DOE test's daily hot-water draw for the high draw pattern. The registry does not publish that annual figure itself. It applies to natural gas only, and it was retrieved from the DOE CCD on 2026-09-19. Against the class median of 260 therms, the model sits 18 therms lower. It ranks 90th lowest for energy use of 414 models, which places it in the lowest quarter of its class.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The registry gives this model a first hour rating, the gallons of hot water available in the first hour from a full tank, of 79 gallons. Its rated volume is 38 gallons. Those two figures are the ones to compare with your own busiest hour. Households with a different draw will not use exactly 242 therms, and this page has no figure for other draw patterns. To narrow options by fuel, space and size, use the water heater selector.

Running cost is not stated in the text because it depends on your state's average residential gas price. The cost calculator on your own ZIP applies that rate to the 242 therms figure. The methodology page explains how the annual cost is calculated. The figure holds only at the high draw pattern, so a household with a different draw will see a different cost. At the same gas price, this model's annual cost is lower than a median model's by the cost of 18 therms. A modeled installed-cost range appears in its own block on this page. To look up a same-class unit, find a replacement by model number, starting from PROG40-40N RH67 PV.