A. O. SMITH ENLB-50 1**

This site computed the 3,493 kWh figure; it was not taken from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that the DOE test sets for the medium draw pattern. For this model the UEF is 0.93, from the DOE CCD retrieved 2026-09-19. The result holds only at that test draw. A household that uses more hot water each day than the test assumes will use more electricity. A household that uses less will use less. The data does not say how large either difference would be. The page on how the annual cost is calculated sets out the steps behind the calculation.

In DOE's definition, the medium draw pattern stands for a typical household on a busy morning. Two registry figures show how this tank handles that peak. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 60 gallons. Its rated volume is 44 gallons. The 3,493 kWh figure matches a household whose busiest hour stays within 60 gallons. This rating does not cover a household that needs more hot water in its peak hour. If you are matching an existing unit, the same-class replacement search by model number lists other electric tank models at the medium draw pattern. The water heater selector by fuel, space and size covers other classes.

Among the 426 models in its class, this model ranks 153rd lowest in energy use. That places it in the second-lowest quarter of the class. The rank shows position only. The size of the gap to the median is the 38 kWh stated above, at the same test draw. This text does not give the running cost because it depends on your own utility's electricity tariff. The page calculates the cost from your ZIP, and the cost calculator on your own ZIP repeats that calculation. The installed price range appears in its own block with its source and date. It is a modeled installed-cost range, not a quote. The registry data does not show how this unit performs outside the DOE test conditions.