Stiebel Eltron DHC-E 8

This site computed the 615 kWh figure itself. It is not a figure the registry publishes. 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 this unit the registry lists a UEF of 0.96, taken from the DOE CCD and retrieved on 2026-09-19. A household that draws more or less hot water each day than the test assumes will use a different amount of electricity. The registry also lists a maximum flow rate in gallons per minute of 0.7, which limits how much hot water the unit delivers at one time. The steps behind the energy figure are set out on the page explaining how the annual cost is calculated.

Among the 271 models registered as an electric tankless unit at the very small draw pattern, this one ranks 77th lowest for energy use. That rank places it in the second-lowest quarter of its class, which fits the median result given above. The very small pattern covers small units, meaning a single bathroom or a point-of-use heater under a sink. The figures on this page therefore apply to that kind of use and not to a larger household supply. Tankless units tested at other draw patterns are not part of this class of 271, so their annual figures are not compared here. To check another model in the same class, use the same-class replacement search by model number.

This text gives no running cost, because the cost of 615 kWh a year depends on the reader's own utility electricity tariff. The page computes that cost from your ZIP code, so two readers checking the same unit can see different results. The installed price is shown in its own block with its source and date, as a modeled installed-cost range rather than a quote. To work out the cost at your own rate, open the cost calculator for your own ZIP. This page does not know your household's actual hot-water use, so the energy figure stays tied to the test's daily draw.