Aquapower Mini-E 3.5-1

The figure of 615 kWh is not a registry value. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.96 for the Mini-E 3.5-1. It also used the daily hot-water draw that the DOE test assigns to the very small draw pattern. The fuel is electricity, and the source is the DOE CCD, retrieved 2026-09-19. The figure holds only at that test draw. A household that draws a different amount of hot water than the test does will use a different amount of electricity, and the registry does not record that. The calculation is set out in how the annual cost is calculated.

The Mini-E 3.5-1 is compared with the 271 models registered as an electric tankless unit at the very small draw pattern. It ranks 77th lowest energy use of 271, which places it in the second-lowest quarter of its class. The class median is 615 kWh, and the difference from it is 0 kWh, so this model is equal to the median. Both comparisons cover only this draw pattern and this fuel. The maximum flow rate in gallons per minute is 0.4. That suits small units, meaning a single bathroom or a point-of-use heater under a sink. A use that needs more than 0.4 gallons per minute at once is outside what the registry lists for this model.

The running cost is not written here, because it depends on your own utility electricity tariff. Multiply 615 kWh by your rate per kilowatt-hour, or use the cost calculator on your own ZIP, which does the same calculation with your local tariff. The modeled installed-cost range appears in its own block on this page with its source and date, and it is not repeated in this text. If you are replacing this unit, find a same-class replacement by model number and compare its annual energy at the same draw pattern with the class median of 615 kWh.