Stiebel Eltron DHC 6-2

The registry does not print the 615 kWh figure. This site computed 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 very small draw pattern. The registry lists a UEF of 0.96 for this model, from DOE CCD data retrieved 2026-09-19. The class is the 271 models registered as an electric tankless unit at the same draw pattern. Within that class, this model's annual use equals the class median of 615 kWh, a difference of 0 kWh. Its rank of 77th lowest places it in the second-lowest quarter of its class for energy use. The steps behind the annual figure are set out in how this site calculates annual energy and cost.

DOE places this model in the very small draw pattern. In plain terms, that covers small units: a single bathroom, or a point-of-use heater under a sink. The registry lists a maximum flow rate in gallons per minute of 0.6 for it. A fixture or group of fixtures that needs more than 0.6 at once is outside what the registry lists for this unit. The 615 kWh figure holds only at the test's daily draw. For a household drawing a different amount, this page gives no annual figure. Readers who need a different fuel, space or size can use the water heater selector by fuel, space and size. Those replacing an existing heater can find a same-class replacement by model number.

This text does not state a running cost for the Stiebel Eltron DHC 6-2. That cost depends on the 615 kWh of electricity and on the reader's own utility tariff, which this page does not know in advance. The page computes it from the reader's ZIP instead of giving a single figure. The running cost calculator for your own ZIP works the same way. Because this model's annual use equals the class median of 615 kWh, its running cost at the same tariff matches a median model in its class at the test draw. The modeled installed-cost range appears in its own block on this page, with its source and date. That range is a model, not a quote.