Stiebel Eltron Mini-E 2.5-1

This site calculated the 609 kWh figure; the registry does not list 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 the very small draw pattern. For the Mini-E 2.5-1, the UEF is 0.97. The source data comes from the DOE CCD, retrieved 2026-09-19. The figure holds only at the federal test's daily draw. At a different daily draw, it does not apply, and this page has no figure for that case. The steps behind the calculation are set out in how this site calculates annual energy and cost.

The class for this comparison is the 271 models registered as an electric tankless unit at the very small draw pattern. Within that class, the Mini-E 2.5-1 ranks 37th lowest for energy use. Its 609 kWh sits 6 kWh below the class median of 615 kWh. The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. The unit's maximum flow rate in gallons per minute is 0.2. A home that needs hot water at several fixtures at the same time is outside this draw pattern, and this class comparison does not cover it. To check a like-for-like swap, use find a same-class replacement by model number. For other sizes, use the water heater selector by fuel, space and size.

The running cost is not stated in this text. It depends on your own utility's electricity tariff, so the page calculates it from your ZIP instead of estimating it. The input is the same 609 kWh at the very small draw pattern; only the rate changes. You can run that figure in the cost calculator on your own ZIP. The installed price range is shown in its own block, with its source and date. It is a modeled installed-cost range, not a quote. The running cost at a daily draw above the federal test's is not available on this page.