ARISTON ENS30T-*

This site computes the 2,439 kWh figure; the registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the low draw pattern. This model's UEF is 0.92. The result reflects the federal test's draw, not the use in any particular home. The source is the DOE CCD, retrieved 2026-09-19. It ranks 19th lowest in energy use among the 163 models registered as an electric tank at the low draw pattern. That rank puts it in the lowest quarter of its class, while its figure sits at the class median given above. The steps are set out in how this site calculates annual energy and cost.

The low draw pattern represents a one- or two-person household, so the 2,439 kWh figure applies to that level of use. This model has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 41 gallons. Its rated volume is 27 gallons. A household that uses more hot water than the low pattern falls outside the condition behind the figure. For such a household, this data does not include the model's energy use at a higher draw. If you are matching a unit by model number, you can find a same-class replacement by model number. If you are comparing on other factors, you can use the water heater selector by fuel, space and size.

This text does not state a running cost. That cost depends on your own utility's electricity tariff, and this data does not include it. The page calculates the cost from your ZIP by applying your rate to the 2,439 kWh used at the low draw pattern. The cost calculator for your own ZIP shows that result. A result based on someone else's tariff would not apply to your home. Energy use at your household's actual draw is not available here, so the cost reflects only the federal test's draw. The installed price range appears in its own block with its source and date. It is a modeled installed-cost range, not a quote.