Stiebel Eltron DHC-E 12

The 635 kWh figure comes from this site, not from the registry. We calculate 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. For this model the UEF is 0.93. The source is the DOE Compliance Certification Database (DOE CCD), retrieved 2026-09-19. The class is the 271 models registered as an electric tankless unit at the very small draw pattern. Within that group, this model ranks 218th for lowest energy use, out of 271. That puts it in the highest quarter of its class for energy use. The rank and the median gap both assume the same federal test draw. How the annual cost is calculated sets out the full method.

The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. The registry lists this model's maximum flow rate in gallons per minute as 1.2. The 635 kWh figure describes use at that test draw only. It does not describe a household that draws more hot water each day than the test assumes. The registry does not report this model's energy use at any other draw. That value is therefore not available here. For a need larger than the very small draw pattern, this model's class figures do not apply. The selector by fuel, space and size lists other classes, each with its own draw pattern.

This text gives no running cost for the Stiebel Eltron DHC-E 12. The cost of 635 kWh of electricity depends on your own utility tariff, and that rate is not part of the registry data. The page therefore computes the cost from your ZIP rather than stating a single figure. You can check it with the cost calculator on your own ZIP. The result still rests on the federal test's daily draw for the very small draw pattern, not on your measured use. The installed price appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote. Your actual bill and your actual installed price are unknown to this page.