Stiebel Eltron Mini 4-2

The registry does not print the 622 kWh figure; this site computed it. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.95 for this model. It also uses the DOE test's daily hot-water draw for the very small draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The figure holds only at that test draw. A household using more or less hot water will see a different total, and that total is not available here. This model is compared with the 271 models registered as an electric tankless unit at the very small draw pattern. Among them, it ranks 152nd for lowest energy use. How this site calculates annual energy and cost sets out the steps.

The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. For this model, the registry lists a maximum flow rate in gallons per minute of 0.4. The 622 kWh rating therefore describes a unit serving that kind of outlet, at that flow. It does not describe a unit asked to supply several fixtures at once. The registry gives no energy figure for that use. A plumber or seller checking a swap can use the same-class replacement search by model number to find units in this class. A homeowner who needs more than 0.4 can compare other types in the selector by fuel, space and size.

This text does not state the running cost. It depends on your own utility electricity tariff, so the page computes it in the cost calculator for your ZIP. The calculation prices the 622 kWh at your rate, under the same very small draw pattern condition. The 7 kWh gap to the class median, given above, is priced the same way. Its cost at your rate is not available until you enter a ZIP. If your tariff changes, the cost changes with it, while the 622 kWh test figure stays the same. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote.