Aquapower DHC 4-2

The 622 kWh figure is computed by this site, 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 for the very small draw pattern. For the Aquapower DHC 4-2, the UEF is 0.95, from the DOE CCD, retrieved 2026-09-19. The figure holds only at that test draw. A household that uses more hot water than the test assumes will use more electricity. A household that uses less will use less. The fuel is electricity, so the figure is given in kWh. The steps from registry data to a yearly figure are set out in how the annual cost is calculated.

The class for this comparison is the 271 models registered as an electric tankless unit at the very small draw pattern. The Aquapower DHC 4-2 ranks 152nd lowest energy use of 271. That places it in the second-highest quarter of its class for energy use, above the median given in the summary. The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. Those are the uses this rating describes. Its maximum flow rate in gallons per minute is 0.4. That is the limit to check against the fixture the unit will serve. A job that needs more than 0.4 at once, or hot water for a whole house, falls outside what this rating describes.

The running cost is not stated in this text. It depends on your own utility's electricity tariff, so the page computes it from your ZIP instead of an assumed rate. The cost uses the same 622 kWh at the test draw, so it carries the same condition. Any change in your hot-water use changes the cost as well as the energy figure. To run the figure on your own tariff, use the cost calculator on your own ZIP. To compare other models among the 271 in this class, find a same-class replacement by model number. The installed price range appears in its own block, with its source and date. It is a modeled range, not a quote.