Stiebel Eltron Mini -E 3-1

The 609 kWh figure is calculated 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 this pattern. For this model, the UEF is 0.97. The registry data come from the DOE CCD and were retrieved on 2026-09-19. The figure describes the test's daily draw, not your household's actual use. A household that draws a different amount of hot water will get a different annual figure. The steps are explained in how the annual cost is calculated.

The very small draw pattern covers small units, such as a heater for 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. That is the limit to check against the fixture the unit will serve. A fixture that needs more than 0.3 is outside what this unit is rated to supply. Its energy figure also cannot be compared with units tested at larger draw patterns, because those tests use a different daily draw. For a whole home or several fixtures, use the water heater selector by fuel, space and size. To match this unit within its own class, use the same-class replacement finder by model number.

This text does not state the running cost, because it depends on your own utility electricity tariff. The page calculates it from your ZIP code using the 609 kWh figure. Any cost shown therefore has the same condition as that figure: the federal test's daily draw at the very small draw pattern. This model is in the lowest quarter of its class for energy use. At any given rate, it costs less to run than most units in the class. Against a unit at the class median, the yearly energy gap is 6 kWh. The cost gap is that amount multiplied by your rate. To apply your own rate, use the cost calculator for your ZIP. The installed-cost range on this page is a modeled range, not a quote.