Stiebel Eltron DHC 9-3

The 622 kWh figure is computed by this site. 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 very small draw pattern. For this model, the registry lists a UEF of 0.95. The source is the DOE CCD, retrieved 2026-09-19. The figure assumes the test's daily draw. A household that draws more or less hot water than the test will have a different yearly total. This page has no measured use from any real home, so that difference is unknown here. The steps behind the figure are set out in how the annual cost is calculated.

The class is the 271 models registered as an electric tankless unit at the very small draw pattern. Within it, this model ranks 152nd lowest in energy use, in the second-highest quarter of its class. The very small draw pattern 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 0.9. So the 622 kWh figure describes use at that scale. It does not describe a home that needs one unit to supply several fixtures at once. For that kind of home, the registry data here gives no annual figure for this model. To compare it with other models in the same class, you can find a same-class replacement by model number.

The text on this page gives no running cost. The yearly cost of 622 kWh depends on your own utility's electricity tariff. For that reason, the page computes the cost from your ZIP instead of a single figure for every reader. To check the cost at a different rate, use the cost calculator for your own ZIP. The installed price range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote. Neither the running cost nor the installed range changes the energy figure. The 622 kWh value stays tied to the very small draw pattern and the federal test's daily draw.