Ruud PROPH40 T0 RH120

This site calculated the 1,254 kWh 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 medium pattern. This model's UEF is 2.59, taken from the DOE CCD as retrieved on 2026-09-19. It ranks 129th lowest for energy use among the 426 electric tank models registered at the medium draw pattern. The class median is 3,531 kWh a year, so this unit's figure is 2,277 kWh lower under the same test conditions. The comparison holds only within that class and that draw pattern. The page on how the annual cost is calculated sets out the steps behind the calculation.

The medium draw pattern represents a typical family household with a busy morning of hot-water use. This unit's first hour rating, the gallons of hot water available in the first hour from a full tank, is 43 gallons. Its rated volume is 37 gallons. A plumber or homeowner can compare a household's peak morning demand with that first hour rating. If demand regularly runs above 43 gallons in the first hour, the medium pattern may not describe that home. In that case the 1,254 kWh figure would not apply. The data on this page gives no energy figure for any other draw pattern. To compare this unit with others registered in the same class, find a same-class replacement by model number.

Running cost is not stated in this text because it depends on your own utility electricity tariff. At the medium draw pattern, the unit uses 1,254 kWh a year. Multiplying that by your rate per kWh gives the yearly cost under test conditions. The cost calculator on your own ZIP does that step with your local tariff. Actual use in a home can differ from the test's daily draw. No field measurements for this model are available here. An installed price range is not published for the Ruud PROPH40 T0 RH120. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it.