ARISTON ENS50LU-*

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.93 for this model. This site multiplies that UEF by the daily hot-water draw of the medium draw pattern. The result is 3,493 kWh a year, and the registry itself does not publish it. The figure comes from DOE CCD data retrieved on 2026-09-19. It holds only at the federal test's daily draw. A household that draws more or less hot water will use a different amount. Method details are in how the annual cost is calculated.

Among the 426 models registered as an electric tank at the medium draw pattern, this one has the 153rd lowest energy use. That places it in the second-lowest quarter of its class. Its 3,493 kWh sits 38 kWh below the class median of 3,531 kWh. The comparison uses energy use only and leaves out purchase price. First hour rating, the gallons of hot water available in the first hour from a full tank, is 52 gallons for this model. The rank covers only this class and draw pattern. To compare other units, use the same-class replacement finder by model number.

The energy figure of 3,493 kWh suits a check on households whose hot-water use resembles the medium draw pattern. It is a weaker guide for households that use much more or less hot water each day, because the annual figure scales with the draw. Capacity is a separate question from energy: the rated volume is 42 gallons. Running cost depends on your own electricity rate, which the registry does not contain. This page states no cost amount for that reason. The cost calculator on your own ZIP multiplies your utility rate by 3,493 kWh. The installed price range appears in its own block and is not repeated here.