RELIANCE WATER HEATERS ENS-50 1**

The 3,531 kWh figure is computed by this site, not published by 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 0.92. The figure therefore holds only at that test draw. A household that draws more or less hot water will use a different amount. The registry data come from the DOE CCD, retrieved on 2026-09-19. The comparison class is the 426 models registered as an electric tank at the medium draw pattern. How the yearly figure is built is set out in how the annual cost is calculated.

This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 57 gallons. Its rated volume is 46 gallons. DOE places it in the medium pattern, which it sets for a typical household. If a home needs more than 57 gallons on a busy morning, its demand falls outside what this rating covers. The data here do not show how the unit performs above that demand. A home with lighter use would draw less than the test draw, so its yearly energy would differ from 3,531 kWh. To compare units by fuel, space and size, use the selector by fuel, space and size. To match a unit already in place, you can find a same-class replacement by model number.

Running cost is not given in this text. It depends on the reader's own utility electricity tariff, so no figure is estimated here. The page applies your rate to this model's 3,531 kWh at the medium draw pattern, using your ZIP. You can run that in the cost calculator on your own ZIP. Because the unit sits at the class median of 3,531 kWh, its computed cost on a given rate would equal that of the median model at the same test draw. The installed price range appears in its own block, with its source and date. It is a modeled range, not a quote. The unit's energy use at draws other than the test draw is not available in this data.