Energy factor
![The energy factor is determined using a stylized hot water use pattern. Hot water is drawn in six equal draws totaling 64.3 gallons, and a standby period of 18 hours follows.](/Images/godic/202501/11/Energy_Factor_Draw_Patter_Water_Heaters.svg0147.png")
An energy factor is a metric used in the United States to compare the energy conversion efficiency of residential appliances and equipment. The energy factor is currently used for rating the efficiency of water heaters, dishwashers, clothes washers, and clothes dryers. The term is used by the United States Department of Energy to develop and enforce minimum energy conservation standards under the Energy Conservation Program.