Stiebel Eltron DHC 3.5-1 Trend

This site calculated the 597 kWh figure. It is not taken from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw. This model's UEF is 0.99, from DOE CCD data retrieved 2026-09-19. The class is the 271 models registered as electric tankless units at the very small draw pattern. Within that class, this model has the 3rd lowest energy use. That places it in the lowest quarter of its class for energy use. The rank and the median compare energy use at the test draw only. The method is set out on the page explaining how the annual cost is calculated.

The very small draw pattern covers small units that serve 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 0.4. The 597 kWh figure assumes this scale of daily use. It does not describe a household that draws more hot water each day, because that falls outside the test condition. The registry does not give this model's energy use at larger draws, so that figure is not available. The selector by fuel, space and size lets you compare models on those three terms. If you are checking a unit already in place, you can find a same-class replacement by model number.

The running cost is not stated here because it depends on your own utility electricity tariff. That cost equals the 597 kWh a year multiplied by your rate per kWh. The cost calculator on your own ZIP looks up that tariff and does the calculation. The same limit applies to the 18 kWh gap below the class median. What that gap is worth in money also depends on your rate. The installed price range is shown in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote, and its figures are not repeated here.