Ruud PROE28 S2 RH95 B

The figure of 2,439 kWh is electricity use at the low draw pattern only, so a household with different hot-water use would see a different total. This site computed it; the registry does not list it. The inputs are the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 for this model, and the federal test's daily hot-water draw for this draw pattern. The energy source is the DOE CCD, retrieved 2026-09-19. The tank has a rated volume of 26 gallons and a first hour rating, the gallons of hot water available in the first hour from a full tank, of 45 gallons. The steps of the calculation are set out on the methodology page for water heater costs.

The class used for comparison is the 163 models registered as an electric tank at the low draw pattern. Their median is 2,439 kWh, and this model is 0 kWh from it, so it is equal to the median. Its rank is 19th lowest energy use of 163, which places it in the lowest quarter of its class for energy use. This applies to a small household whose hot-water use matches the low draw pattern. It does not describe a household that draws more hot water than the federal test assumes; the energy use for such a household is not available here. To compare units by fuel, space and size, use the water heater selector.

The running cost is not stated in the text, because it depends on your own utility electricity tariff. It scales with the 2,439 kWh figure, so the same model costs more or less to run at a different rate. To see the cost at your rate, enter your ZIP in the cost calculator. The installed price range is not published for this model: its ratings, 26 gallons rated volume and 45 gallons first hour rating, lie outside the range the cost database's model was fitted on, and the range is not stretched past it. For a unit in the same class, find a same-class replacement by model number.