Rheem SPEX60

The registry does not print the 615 kWh figure. This site calculated it from two inputs. The first is the unit's UEF, the ratio of hot water delivered to energy used, which the registry lists as 0.96. The second is the DOE test's daily hot-water draw for the very small pattern. The data source is the DOE Compliance Certification Database, retrieved 2026-09-19. The very small pattern covers small units: a single bathroom, or a point-of-use heater under a sink. The 615 kWh value therefore holds only at that test draw. If your household uses more or less hot water than the test assumes, your use will differ. The data does not show how large that difference would be. The steps are set out in how the annual energy and cost are calculated.

Among the 271 models registered as an electric tankless unit at the very small draw pattern, this one ranks 77th lowest for energy use. Its 615 kWh is equal to the class median of 615 kWh, so the difference is 0 kWh. The registry also lists a maximum flow rate in gallons per minute of 0.6 for this model. That rating fits the test's own scope of a single bathroom or one sink. A job that needs more than 0.6 at once falls outside this unit's rated flow. The data does not list the flow needed by specific fixtures, so that check stays with the installer. To compare it with a model from the same class, use find a same-class replacement by model number.

Running cost is not given in this text because it depends on your own utility's electricity tariff. The page multiplies the 615 kWh figure by the rate for your ZIP in the cost calculator on your own ZIP. A plumber or seller quoting a figure to a customer should use that customer's own rate, not a national average. Because this unit sits at the class median of 615 kWh, a median unit in its class would give the same cost at the same rate. The installed price range appears in its own block on this page with its source and date. That range is a modeled installed-cost range, not a quote from any installer.