Mits Air US3-RSJ-15/300RDVN3-L3

The figure of 1,240 kWh is the electricity this unit uses in a year at the high draw pattern. This site computed it, not the registry, from the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for that pattern. The registered UEF is 4. The source is DOE CCD, retrieved 2026-09-19. Against the 194 models registered as an electric tank at the high draw pattern, this unit sits 66 kWh below the 1,306 kWh median. It ranks 30th lowest for energy use of 194, which places it in the lowest quarter of its class. The calculation is set out on the methodology page.

The high draw pattern describes a larger household, or one where showers and laundry overlap. For that use, the first hour rating, the gallons of hot water available in the first hour from a full tank, is 91 gallons, and the rated volume is 74 gallons. Those two figures are the ones to compare with a household's own busiest hour. The energy figure does not say whether the tank covers that hour. It also does not describe a household that uses much less or much more hot water than the federal test's daily draw, because 1,240 kWh is a test-condition value and not a measurement of any home. The water heater selector filters by fuel, space and size.

The running cost is not stated here because it depends on your own utility electricity rate, and no rate is assumed. The 66 kWh gap to the class median is an amount of energy, not a cost. It applies only at the high draw pattern. To turn 1,240 kWh into a yearly cost, use the cost calculator, which applies the rate for your ZIP. The installed price range appears in its own block on the page, with its source and date, and is not repeated in this text. If you need a unit in the same class, you can find a same-class replacement by model number, starting from US3-RSJ-15/300RDVN3-L3.