Lennox WHES040L45TN240B****

The 2,439 kWh figure is computed by this site, not published by the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 for this model. It then applies the DOE test's daily hot-water draw for the low draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The figure therefore describes electricity use at the test's draw, not at any particular home's draw. A household drawing more hot water each day than the test assumes would use more than 2,439 kWh a year. One drawing less would use less. How much more or less for a given home is not available in the data. The steps behind the figure are set out in how the annual cost is calculated.

The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 50 gallons. Its rated volume is 36 gallons. The low draw pattern it was tested at corresponds to a one- or two-person household, so the 2,439 kWh figure applies to homes of that size. A larger household falls outside the tested pattern. So does a home whose busiest hour calls for more than 50 gallons. For such a home, the annual figure on this page does not describe expected use, and the data gives no substitute figure. Other electric tanks and other fuels can be compared in the water heater selector by fuel, space and size.

Among the 163 models registered as an electric tank at the low draw pattern, this one ranks 19th lowest in energy use. That places it in the lowest quarter of its class. Its figure is nonetheless the class median, as the summary above states. The data does not say how models with the same figure are ordered in the rank. Running cost is not given in this text because it depends on your own utility's electricity tariff. The page computes it from your ZIP; you can also use the running cost calculator for your own ZIP. The installed price range sits in its own block with its source and date. It is a modeled installed-cost range, not a quote.