Ruud PROE55 T2 RH94

The 3,531 kWh figure is computed by this site. The registry does not publish it. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 for this model. That UEF is combined with the DOE test's daily hot-water draw for the medium draw pattern. The UEF comes from the DOE CCD, retrieved 2026-09-19. The figure holds only at the federal test's daily draw. A household that draws more or less hot water each day will use a different amount, and that amount is not available here. Among the 426 electric tank models at the medium draw pattern, this model sits in the second-lowest quarter for energy use. The page on how the annual cost is calculated sets out the full method.

The Ruud PROE55 T2 RH94 has a rated volume of 55 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 72 gallons. DOE rates it at the medium draw pattern, which reflects a typical household's daily hot-water use. A plumber or seller checking a listing can match the 3,531 kWh figure to that pattern and to this electric tank class. Under the test draw, its energy use matches the middle of its class, with a difference of 0 kWh from the median. For a side-by-side check against other units, the water heater selector by fuel, space and size filters the registry on those three factors.

If a household needs more hot water in its busiest hour than the 72-gallon first hour rating, it needs more than this model is rated to deliver. A reader who wants energy use below 3,531 kWh under the test draw would look at the models ranked ahead of 213th. The running cost is not stated in this text. It depends on your own utility electricity tariff. The cost calculator for your own ZIP applies that rate to 3,531 kWh a year at the medium draw pattern. If you are replacing this unit, you can find a same-class replacement by model number and compare its figures with those given here.