Stiebel Eltron Mini 2-1

This site computed the 597 kWh figure. The registry does not publish it. The figure 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. The UEF for this model is 0.99. The source is the DOE CCD, retrieved 2026-09-19. We compared it with the 271 models registered as an electric tankless unit at this draw pattern. It has the 3rd lowest energy use of those models, which puts it in the lowest quarter of its class. The figure does not cover use at other daily draws, and no value for those draws is available here. The steps are set out in the method behind the annual figures.

The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. For the Mini 2-1, the registry lists a maximum flow rate in gallons per minute of 0.2. The 597 kWh figure applies to that kind of use at the federal test's draw. A reader who serves more outlets or a larger household is outside the conditions behind this figure. For that case, this page has no energy figure to offer. The water heater selector by fuel, space and size filters by those needs. To check another unit in the same class as the Mini 2-1, use the same-class replacement search by model number.

The running cost is not stated in this text. It depends on the reader's own utility electricity tariff. The page therefore computes it from the reader's ZIP and applies that rate to the 597 kWh yearly figure. Any cost shown has the same condition as the energy figure: the very small draw pattern at the federal test's draw. This model sits 18 kWh below the 615 kWh median. The cost difference from a median unit therefore also depends on the local rate. The cost calculator on your own ZIP shows the result. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote.