illustration of man staring at a washer with large label that says MEF and WF on it
Illustration: Edwin Fotheringham
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Decoding Energy Star Labels

Most HE (high-efficiency) washers are also rated by MEF and WF. Here's what the new acronyms mean:

MEF: Modified Energy Factor is a measure of the energy used to run the washer and heat the water. The higher the MEF, the more energy-efficient the washer.

WF: Water Factor is based on the number of gallons of water consumed per cubic foot of capacity. The lower the WF, the more miserly the washer.
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