Ruud PROE38 S2 RH93 SB-LO

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.93 for Ruud PROE38 S2 RH93 SB-LO. This site, not the registry, computed the annual figure of 2,413 kWh from that UEF and the DOE test's daily hot-water draw for the low draw pattern. The source is DOE CCD, retrieved 2026-09-19. The figure applies only under that test condition and does not measure the use of any particular home. The class is the 163 models registered as an electric tank at the low draw pattern, and its median is 2,439 kWh. This model is 26 kWh below that median, ranks 9th lowest in energy use of 163, and sits in the lowest quarter of its class.

The 2,413 kWh figure describes a small household, which is the group the low draw pattern represents. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 42 gallons, and the rated volume is 35 gallons. A household that draws more hot water than the low draw pattern is outside the condition behind 2,413 kWh. This page has no energy figure for other draw patterns, so that value is not available here. Demand in a peak hour is better compared with the 42 gallon rating. To compare tanks by fuel, space and size, use the water heater selector. To look for a same-class replacement from a model number, use the replacement search.

The running cost is not stated in this text because it depends on your own utility electricity tariff. Multiplying 2,413 kWh by your rate per kilowatt-hour gives the yearly electricity cost at the low draw pattern. The 26 kWh gap to the class median of 2,439 kWh converts to a cost difference the same way, at the same rate. The cost calculator for your ZIP applies your local rate, and the page on how the annual cost is calculated explains the steps. The modeled installed-cost range is shown in its own block with its source and date. It is a modeled range, not a quote, and it is not repeated in this text.