LOCHINVAR HESF-50 1**

The registry does not print the 3,531 kWh figure. This site computed it from 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. For this model the UEF is 0.92, from DOE CCD data retrieved 2026-09-19. The figure therefore holds only at the federal test's daily draw. This page does not give an annual energy figure for this model at any other level of household use. The model has a rated volume of 46 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 67 gallons. The full steps are set out in how the annual figure is calculated.

Among the 426 models registered as an electric tank at the medium draw pattern, this one ranks 213th for lowest energy use. Its 3,531 kWh matches the class median of 3,531 kWh, a difference of 0 kWh. At the medium draw pattern, this model uses neither more nor less electricity than the class median. That comparison holds only for households whose daily use is close to the medium draw pattern. For households well above or below it, the registry data used here has no figure for this model. A reader who wants a unit from the same class can find a same-class replacement by model number.

Running cost is not stated in this text because it depends on your own utility's electricity tariff. The page works it out from your ZIP and the 3,531 kWh figure at the medium draw pattern. Any cost given without your rate could not be checked, so none is written here. This model's energy use equals the class median of 3,531 kWh. At the same test conditions and on the same tariff, its running cost would therefore match that of a median-use tank in this class. To see the cost for your address, use the cost calculator on your own ZIP. The modeled installed-cost range appears in its own block on this page, with its source and date. That range is not a quote.