Ruud PROE28 S2 RH93 SB-HO

This site calculated the 3,456 kWh figure; the registry does not list it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the medium draw pattern. This model's UEF is 0.94, from the DOE CCD retrieved 2026-09-19. The annual figure applies only at that federal test draw. A household that uses more or less hot water each day will use more or less electricity than 3,456 kWh. This page has no figures for other draw levels. The steps are set out in how the annual cost is calculated, which uses the same inputs.

The medium draw pattern represents a typical mid-sized household with a busy morning peak. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 53 gallons. Its rated volume is 26 gallons. A household whose morning peak stays within 53 gallons is close to the test condition behind the 3,456 kWh figure. A household that often needs more at peak does not match that condition. This data does not show how the unit performs under a heavier load. Readers who need a different size or fuel can compare other classes with the selector by fuel, space and size.

In its class, the model ranks 137th for lowest energy use among 426 models. That puts it in the second-lowest quarter of the class. The gap is 75 kWh a year below the class median of 3,531 kWh, both at the medium draw pattern. This text does not state a running cost, because it depends on your own utility's electricity tariff. The cost calculator for your own ZIP applies your local rate to 3,456 kWh. No installed price range is published for this model. Its ratings lie outside the range that the cost database's model was fitted on. To check a same-class alternative, use find a replacement by model number.