Stiebel Eltron DHC 5-2

The 609 kWh figure comes from this site's own calculation. The registry does not publish it. The calculation 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 0.97, taken from the DOE CCD on 2026-09-19. There are 271 models registered as an electric tankless unit at the very small draw pattern. Among them, this model has the 37th lowest energy use. That puts it in the lowest quarter of its class. The figure applies only at the test's daily draw. The registry does not record how much hot water a household actually uses, so that figure is not available here. The steps are explained in how this site calculates annual energy and cost.

The very small draw pattern is for small units: a single bathroom, or a point-of-use heater under a sink. This model's maximum flow rate in gallons per minute is 0.5. The 609 kWh figure describes use at that scale. The class comparison applies to a supply for one sink or one bathroom. It does not describe a supply for several outlets or a whole house. For that kind of demand, the 615 kWh class median is the wrong benchmark, and a different class applies. A plumber or seller checking a swap can look up a same-class replacement by model number. To look beyond this class, use the selector by fuel, space and size, which covers other fuels and sizes.

This text gives no running cost. What 609 kWh of electricity costs depends on your own utility's electricity tariff. The page works that cost out from your ZIP in its cost block. You can run the same calculation in the cost calculator for your own ZIP. On a flat per-kWh rate, the yearly cost gap to a median model in this class is 6 kWh multiplied by your rate. On a tiered or time-of-use tariff, that simple multiplication may not hold. The installed price range has its own block with its source and date. It is a modeled installed-cost range, not a quote, and this text does not repeat its figures.