AMERICAN STANDARD WATER HEATERS ENS40H-*

The registry does not print the 3,531 kWh figure. This site calculated it from the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the medium pattern. For the ENS40H-*, the UEF is 0.92, taken from DOE CCD records retrieved 2026-09-19. So 3,531 kWh describes the federal test day repeated over a year. It is not a measurement from any particular home. The registry gives no energy figure for this model at other daily draws, so that value is not available here. The steps from UEF to annual energy and cost are set out in how the annual cost is calculated.

DOE rates this model at the medium pattern, which stands for a typical household's daily hot-water use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 51 gallons. The rated tank volume is 37 gallons. A household whose busiest hour needs more than 51 gallons is outside what this rating covers. On energy, the model ranks 213th of 426 and sits in the second-lowest quarter of its class. It is not among the lowest-energy tanks in the class. If you need another tank in the same class, use find a same-class replacement by model number. To compare across fuels and sizes, use the selector by fuel, space and size.

This text gives no running cost for the ENS40H-*, because the cost depends on your own utility electricity rate. The page calculates it from your ZIP; you can also enter it in the cost calculator on your own ZIP. What the data does show is the gap to the class median: 0 kWh. On any single rate, this model's yearly electricity cost therefore matches a tank using the median 3,531 kWh. Any saving against a median-class tank would have to come from somewhere other than rated energy use. The installed price range appears in its own block, with its source and date. It is a modeled range, not a quote from an installer.