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What is MEF and Water Factor?

April 26, 2017Factor mef water

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What is MEF and Water Factor?

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Modified Energy Factor (MEF) is an equation that takes into account the amount of dryer energy used to remove the remaining moisture content in washed items. In addition to the machine energy and water heating energy of the washer, MEF is the energy performance metric for Energy Star qualified clothes washers. The higher the MEF, the more efficient the clothes washer is. Water Factor is the number of gallons per cycle, per cubic foot that the clothes washer uses. The lower the water factor, the more efficient the washer is. If a clothes washer uses 30 gallons per cycle and has a tub volume of 3.0 cubic feet, then the water factor is 10.0. Currently, all Energy Star qualified clothes washers must have a minimum MEF of 1.72 and a water factor of 8.0.