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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.
With a 90-degree Fahrenheit rise -- the standard temperature differential that it takes to raise the temperature of cold water -- a 20-gallon electric tank has a recovery rate of 7.5 gallons per hour and a draw efficiency of 14 gallons.