Rheem SPEX3012T

This site calculates the 615 kWh figure. The registry does not publish it. The inputs are the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for this draw pattern. For the SPEX3012T, the UEF is 0.96. The comparison class is the 271 models registered as an electric tankless unit at the very small draw pattern. As stated above, this model matches that class median. At 77th lowest, it is in the second-lowest quarter of the class for energy use. The value applies only at the federal test's draw. No figure is available for any other daily draw. The source is DOE CCD, retrieved 2026-09-19. The page also explains how the annual energy and cost are calculated.

The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. The registry lists this model's maximum flow rate in gallons per minute as 0.3. Both values come from the same DOE CCD record. The 615 kWh figure does not describe a unit that serves loads outside this draw pattern. The registry gives no energy value for that kind of use. If you need hot water for more than a single bathroom or sink, the selector by fuel, space and size covers other classes. To compare this unit with another of the 271 models in its class, use same-class replacement by model number.

This text gives no running cost. The cost depends on your own utility electricity tariff, and the registry data does not include tariffs. It equals 615 kWh of electricity a year, at the very small draw pattern's test draw, multiplied by your rate. The cost calculator for your own ZIP does that multiplication with your local tariff. This model's energy use equals the class median of 615 kWh, so on any tariff its running cost matches that of a class-median unit. The installed price range has its own block on this page, with its source and date. That range is a modeled installed cost, not a quote.