Midea D40-45FH

The 3,531 kWh figure is computed by this site. The registry does not publish it. 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. For the D40-45FH, the UEF is 0.92, taken from the DOE CCD as retrieved on 2026-09-19. The result holds only at that test draw. A household that draws more or less hot water each day will use a different amount, and the registry does not state that amount. The steps are set out in how the annual energy and cost are calculated.

The class is the 426 models registered as an electric tank at the medium draw pattern. The D40-45FH ranks 213th lowest in energy use of those 426, which places it in the second-lowest quarter of the class. DOE's medium pattern stands for a typical household with a busy morning of hot-water use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 55 gallons. The rated volume is 37 gallons. A household whose busiest hour stays within 55 gallons matches the conditions behind the 3,531 kWh figure. To compare other sizes or fuels, use the water heater selector by fuel, space and size.

The figure does not fit a household whose busiest hour needs more than 55 gallons, since the rating covers only the first hour from a full tank. It also does not fit a reader who wants energy use below the class median. Models ranked ahead of the 213th position use less than 3,531 kWh at the same test draw. To compare this model with others in its class, find a same-class replacement by model number. The running cost is not stated here, because it depends on your own utility's electricity rate. The cost calculator on your own ZIP applies that rate to 3,531 kWh. The installed-cost range appears in its own block with its source and date, as a modeled range, not a quote.