Stiebel Eltron Mini-E 2-1

This site calculated the 609 kWh figure; it is not taken directly from the registry. The figure combines two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used. The second is the DOE test's daily hot-water draw. At the very small draw pattern, this model's UEF is 0.97, from the DOE CCD as retrieved on 2026-09-19. The annual figure applies only at that test draw. A household that uses more or less hot water than the test assumes will use a different amount of electricity. The registry data does not show how far real use differs from the test figure. The steps are set out in how the annual cost is calculated.

The registry lists 271 models as an electric tankless unit at the very small draw pattern. This model ranks 37th lowest in energy use among them. That places it in the lowest quarter of its class, which matches the gap to the median given above. 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 0.3. The 609 kWh figure describes a household whose hot-water use matches that tested scope. To check other units in the same class, use the same-class replacement search by model number.

The rating does not cover a flow need above 0.3, the registry's listed maximum for this model. Hot-water use across several bathrooms falls outside the very small draw pattern, so the 609 kWh figure would not describe it. For those needs, the selector by fuel, space and size lists other classes. The running cost is not written here because it depends on your own utility electricity tariff. The page calculates it from your ZIP, using 609 kWh at the test draw. Without your rate, no running cost for this model is available. The installed-cost range in its own block is a modeled range, not a quote.