Aquapower Mini 3-1

The figure of 635 kWh is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.93 with the daily hot-water draw that DOE assigns to the very small draw pattern. That pattern covers small units, such as a single bathroom or a point-of-use heater under a sink. The registry lists a maximum flow rate in gallons per minute of 0.3. The source is the DOE CCD, retrieved 2026-09-19, and the fuel is electricity. The calculation steps are described in how the annual cost is calculated.

Among the 271 models registered as an electric tankless unit at the very small draw pattern, the median is 615 kWh a year. This model's 635 kWh is 20 kWh above that median. It ranks 218th lowest in energy use of 271, which places it in the highest quarter of its class for energy use. The comparison holds only within this class and at the federal test's daily draw. It does not describe how much hot water any one household draws. A reader who needs more than a single bathroom or a sink is outside the range this figure represents. To compare with other units of the same class, find a same-class replacement by model number.

This page does not state a running cost, because it depends on your own utility electricity tariff. The energy figure is in kilowatt-hours, so multiplying 635 kWh by your rate per kilowatt-hour gives the yearly cost at the federal test's draw. The same multiplication on the 20 kWh gap to the 615 kWh median shows the cost difference from a typical unit in this class. The cost calculator on your own ZIP applies your local rate to this figure. Real use may differ, because the data here do not include your actual hot-water draw. The installed price range appears in its own block, with its source and date, as a modeled range and not a quote.