Mizudo ET006

The figure of 628 kWh per year is computed by this site, not taken from the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, of 0.94, together with the DOE test's daily hot-water draw for the very small draw pattern. The source is the DOE CCD, retrieved 2026-09-19. It applies only at that test draw, so a household that draws more or less hot water will use a different amount of electricity. The registry also lists a maximum flow rate in gallons per minute of 0.7 for this model. That is a flow limit and not an energy figure.

This unit ranks 188th lowest energy use of 271 among electric tankless models registered at the very small draw pattern. That places it in the second-highest quarter of its class for energy use. Its 628 kWh is 13 kWh above the class median of 615 kWh, so it uses more than the typical model in its class at the test draw. The very small draw pattern describes small units, such as a single bathroom or a point-of-use heater under a sink. The figure is relevant to a reader checking a unit for that kind of use. It does not describe larger loads; for those, the water heater selector filters by fuel, space and size.

The running cost is not written here because it depends on your own utility electricity tariff. Multiply 628 kWh by your rate per kWh, or enter your ZIP in the cost calculator to have it done for you. The methodology page explains how the annual cost is calculated. A higher rate raises the result in proportion, and the 13 kWh above the 615 kWh class median is priced at the same rate. The modeled installed-cost range appears in its own block on this page with its source and date. It is a range and not a quote, and it is not restated here. To compare with a same-class unit, find a replacement by model number using ET006.