Stiebel Eltron Mini 6-2

The 628 kWh figure comes from this site's own calculation, not from the registry. 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. This model's UEF is 0.94. The DOE CCD data behind it was retrieved on 2026-09-19. The figure holds only at that test draw. A household that uses more or less hot water will use a different amount of energy. The class is the 271 models registered as an electric tankless unit at the very small draw pattern. Within that class, this model ranks 188th lowest for energy use of 271, which places it in the second-highest quarter. The steps are set out in how this site calculates annual energy and cost.

The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. This unit's maximum flow rate in gallons per minute is 0.6, which is the most hot water it delivers at once. A setting that needs more flow than 0.6 falls outside what this rating covers. The 628 kWh figure, 13 kWh above the class median, is measured at that small daily draw only. For a different fuel, space or size, the water heater selector by fuel, space and size filters by those terms. To check other models in the same class, use find a same-class replacement by model number.

The running cost is not stated in this text. It depends on your own utility's electricity tariff, and this page does not know that tariff in advance. The page computes the cost from your ZIP, using the 628 kWh test-draw figure as the energy input. You can also enter that figure in the water heater cost calculator for your own ZIP. How much energy this unit uses in a real home is not known here. It will match 628 kWh only if your hot-water use matches the DOE test's daily draw. The installed price range appears in its own block, with its source and date. That range is a modeled installed cost, not a quote.