Ruud PROE38 S2 RH93 SB

The 3,456 kWh figure is computed by this site, not taken from the registry. 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 0.94. The inputs come from the DOE Compliance Certification Database, retrieved 2026-09-19. The figure holds only at that test draw. A household drawing more or less hot water will use a different amount. The page on how the annual cost is calculated sets out the same inputs step by step.

Within its class, the model ranks 137th for lowest energy use among the 426 electric tanks registered at the medium draw pattern. That places it in the second-lowest quarter of the class. Its gap to the 3,531 kWh median is 75 kWh a year, measured at the test's daily draw. The tank has a rated volume of 35 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 59 gallons. A household whose busiest hour stays within 59 gallons is inside what that rating covers. Energy use at draw patterns other than medium is not available for this model.

A household whose busiest hour needs more than 59 gallons would exceed this tank's first hour rating. The 3,456 kWh figure assumes the medium test draw, so it would not describe that household's use. For that case, the selector by fuel, space and size filters by size. The running cost is not stated in this text. It depends on your own utility electricity tariff applied to the 3,456 kWh figure. The page therefore computes it from your ZIP in the cost calculator on your own ZIP. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote.