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Recovery rate is the amount of water that is heated to a set temperature, per hour. An draw efficiency and gallon capacity of the water heater may be used to calculate the length of the showering period in minutes. Characterized for its maximum hot water use to calculate the peak hot water demand.
The Energy Factor measures a water heater's overall efficiency by comparing the amount of energy coming in to the heater to the amount of energy it puts out. An EF generally ranges from as low as 0.5 to as high as 2.0, but the numbers vary between models; a higher number indicates a more efficient model.