Rheem SPEX3012

The figure of 615 kWh was computed by this site, not the registry. It uses the registry's UEF of 0.96 and the DOE test's daily hot-water draw for the very small draw pattern. UEF, the ratio of hot water delivered to energy used, is the registry value behind the calculation. The source is DOE CCD, retrieved 2026-09-19. Among the 271 models registered as an electric tankless unit at this draw pattern, the Rheem SPEX3012 ranks 77th lowest in energy use. That places it in the second-lowest quarter of its class. Its difference from the class median of 615 kWh is 0 kWh, so on this measure it neither uses more nor less than the median.

The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. The registry lists a maximum flow rate in gallons per minute of 0.3 for this model. A fixture group that needs more than 0.3 falls outside what the registry lists for it. The 615 kWh figure holds only at the test's daily draw for this pattern. The data here give no annual energy for other draw patterns or for a household's own hot-water use. To compare by fuel, space or size, the water heater selector filters on those. To find another unit in the same class, search for a replacement by model number using SPEX3012.

Running cost is not stated in this text because it depends on your own utility electricity tariff. The calculation multiplies the 615 kWh by your rate per kilowatt-hour, and that rate varies with your ZIP. The cost calculator does this on your own ZIP. The page on how the annual cost is calculated sets out the steps. The installed price range appears in its own block on this page with its source and date. It is a modeled installed-cost range, not a quote, so it is not restated here. Because the difference from the median is 0 kWh, a change in your rate moves this unit's running cost the same amount as a median-class unit's.