Aquapower Mini 3.5-1

The annual figure is 635 kWh of electricity, and this site computed it rather than the registry. The calculation starts from UEF, the ratio of hot water delivered to energy used, which is 0.93 for this model. It then applies the DOE test's daily hot-water draw for the very small pattern. The result is valid only at that draw. A household that uses more or less hot water will see a different total. The registry also lists a maximum flow rate in gallons per minute of 0.4. The method behind the annual figure is documented on its own page.

Within its class, this unit uses 20 kWh more than the median of 615 kWh. It ranks 218th lowest in energy use among 271 models, which is the highest quarter of the class. The comparison covers only electric tankless units at the very small draw pattern. The registry describes this pattern as small units, such as a single bathroom or a point-of-use heater under a sink. A reader who wants the lowest energy use in the class has other models to consider, since other models use less. To look for a same-class option, try the replacement finder by model number. To filter by fuel, space and size, use the water heater selector.

The running cost is not stated in this text, because it depends on your utility's electricity tariff. Multiply 635 kWh by your own rate per kilowatt-hour to get the yearly cost at the test's draw. The cost calculator does this from your ZIP. Your actual hot-water use may differ from the test draw, so the result is a reference point and not a bill. The energy data comes from the DOE CCD, retrieved 2026-09-19. The modeled installed-cost range appears in its own block on this page with its source and date. It is a modeled range, not a quote, and it is not repeated here.