EEMAX SPEX100

The registry lists this electric tankless unit with UEF, the ratio of hot water delivered to energy used, of 0.96. This site computed the annual figure of 615 kWh from that UEF. It also used the DOE test's daily hot-water draw for the very small draw pattern. The registry does not publish the annual figure itself. The source is DOE CCD, retrieved 2026-09-19. The figure holds only at that test draw, so a household with a different daily volume would see a different number, which this page does not estimate. The steps are set out in how the annual figure is calculated.

Compared with the 271 models registered as an electric tankless unit at the very small draw pattern, this model has the 77th lowest energy use. That places it in the second-lowest quarter of its class for energy use. The difference of 0 kWh from the median means energy use alone does not set it apart within this class. The registry lists its maximum flow rate in gallons per minute as 1. That fits small units, meaning a single bathroom or a point-of-use heater under a sink. A reader who needs more flow than 1 gallons per minute is outside what this listing shows. To compare other fuels, spaces and sizes, use the water heater selector by fuel, space and size.

The running cost is not written here because it depends on your own utility electricity rate. The cost calculator for your ZIP applies that rate to the 615 kWh figure. A modeled installed-cost range appears in its own block on this page with its source and date. It is not a quote, and its figures are not repeated in this text. Because the annual figure is tied to the very small draw pattern, compare it only with models in the same class, where all 271 share that condition. To start from SPEX100 and look for a unit in the same class, use find a same-class replacement by model number. Data for other draw patterns is not part of this page.