EEMAX SPEX100T

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.98 for this model. This site combined that value with the DOE test's daily hot-water draw for the very small draw pattern. The result is 603 kWh of electricity per year. The registry does not publish that annual figure itself, so it is a calculation by this site, based on DOE CCD data retrieved 2026-09-19. It describes the test's daily draw only. A household that draws more or less hot water than the test will use a different amount. The class median at this draw pattern is 615 kWh, which puts this model 12 kWh below it. The steps behind the calculation are set out on the page about how the annual figures are calculated.

Among the 271 electric tankless models registered at the very small draw pattern, this one ranks 10th lowest for energy use. That places it in the lowest quarter of its class. The draw pattern covers small units, such as a single bathroom or a point-of-use heater under a sink, and the figure is relevant to that kind of use. The registry lists a maximum flow rate in gallons per minute of 1. The data on this page gives no energy figure for larger draw patterns, so 603 kWh should not be carried over to a household with heavier hot-water use. Readers comparing units by fuel, space and size can use the water heater selector.

The running cost is not stated here because it depends on your own utility electricity tariff. The cost is roughly 603 kWh multiplied by your rate for each kilowatt-hour, and this site does not assume a rate. The cost calculator applies your ZIP to the same 603 kWh figure. The installed price appears in its own block with its source and date. It is a modeled range, not a quote, and it is not repeated in this text. If you are checking a unit already in place against the 615 kWh class median, you can find a same-class replacement by model number. Any difference from the median is 12 kWh of electricity per year at the test's draw.