Rheem SPEX3277T

This site calculated the 609 kWh figure; the registry does not list it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for this draw pattern. For the SPEX3277T, the registry lists a UEF of 0.97. The figure applies only at that test draw and does not describe a household's actual use. The inputs come from the DOE CCD, retrieved 2026-09-19. This model is compared with the 271 models registered as an electric tankless unit at the very small draw pattern. It has the 37th lowest energy use among them. That puts it in the lowest quarter of its class, 6 kWh below the class median. The steps behind the figure are set out in how the annual energy and cost are calculated.

The very small draw pattern covers small units, such as a heater for a single bathroom or a point-of-use heater under a sink. The registry gives this model a maximum flow rate in gallons per minute of 0.3. The 609 kWh figure and the 37th rank describe use within that pattern only. This data does not show how the unit would perform when serving a whole house. If your need falls outside the very small pattern, this class is the wrong comparison. The selector by fuel, space and size groups models by those needs. To check other units in this class of 271, use the same-class replacement search by model number.

This text does not state the running cost. It depends on your own utility's electricity tariff, which the page does not know in advance. Instead, the page calculates it from the 609 kWh figure and the rate for your ZIP. Use the cost calculator on your own ZIP to get that result. The running cost follows the energy figure, so the 6 kWh gap to the 615 kWh class median also applies at your rate. The installed price shown elsewhere on this page is a modeled installed-cost range with its own source and date. It is not a quote, and its figures are not repeated here. Neither amount affects the 37th of 271 ranking, which is based on energy use alone.