ARISTON ENS40T-DR***

The 3,493 kWh figure does not appear in the registry itself. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.93 for this model. That ratio is combined with the DOE test's daily hot-water draw for the medium draw pattern. The UEF comes from DOE CCD records retrieved 2026-09-19. The yearly figure therefore holds only at that federal test draw. The registry gives no figure for heavier or lighter household use, so those values are not available on this page. Standby losses, inlet water temperature and thermostat settings in a specific home are also not reported for this model. The steps behind the calculation are listed under how the annual cost is calculated.

The ARISTON ENS40T-DR*** has a rated volume of 36 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 54 gallons. The medium draw pattern it was tested at represents a typical household on a busy morning. A home whose peak-hour demand stays within 54 gallons matches the conditions behind the 3,493 kWh figure. A home whose morning demand runs past 54 gallons falls outside what this rating covers. For that home, the registry figures on this page do not describe its actual use. The selector by fuel, space and size filters other registered models by these same fields.

The class behind the rank is the 426 models registered as an electric tank at the medium draw pattern. Within it, this model's 3,493 kWh sits below the class median of 3,531 kWh, both taken at the federal test's daily draw. It ranks 153rd lowest energy use of 426, so the models ranked ahead of it use less energy a year under the same test. The running cost is not stated in this text. It depends on your own utility's electricity tariff, which this page does not know in advance. The cost calculator on your own ZIP applies your local rate to 3,493 kWh. The installed-cost range sits in its own block, with its source and date, and is a modeled range rather than a quote.