Integrated Modified Energy Factor (IMEF) is a measure of energy efficiency that considers the energy used by the washer during the cycle and while on standby, the energy used to heat the water, and the energy used to run the dryer. The higher the IMEF, the more energy efficient the clothes washer.
Integrated Water Factor (IWF) is a measure of water efficiency in gallons of water consumed per cubic foot of capacity. The lower the IWF, the more water efficient the clothes washer.
Both IMEF and IWF are provided for each model listed in the ENERGY STAR Product Finder for clothes washers.