AMERICAN ENS-40 1**

The figure of 3,531 kWh is not a registry entry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, of 0.92, and the DOE test's daily hot-water draw for the medium pattern. That pattern represents a typical three- or four-person household on a busy morning. The underlying data comes from DOE CCD, retrieved 2026-09-19. Because the figure rests on the test draw, it describes this model under test conditions only. Your own household's hot-water use is not in the data. The steps of the calculation are set out on the methodology page.

Among the 426 models registered as an electric tank at the medium draw pattern, this unit ranks 213th lowest for energy use. Its 3,531 kWh sits 0 kWh from the class median of 3,531 kWh, which places it in the second-lowest quarter of its class. The unit fits a household whose daily use resembles the medium draw pattern. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 55 gallons, and its rated volume is 37 gallons. It fits less well a household whose daily use is far from that draw, because the figure does not carry over to other patterns. The water heater selector filters by fuel, space and size.

Running cost is not stated in the text, because it depends on the electricity tariff you pay. Multiplying 3,531 kWh by your own rate gives the yearly cost at the medium draw pattern, and the cost calculator does this from your ZIP. The modeled installed-cost range appears in its own block on the page, with its source and date, and it is not a quote. If this model is being replaced, the same-class replacement finder starts from a model number. Any comparison should keep the same fuel and draw pattern, since the class of 426 models shares both.