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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.
It takes one Btu per pound of water to raise the temperature by one degree Fahrenheit. The standard size of American hot water heaters is 40 gallons, and each gallon of water weighs 8.33 pounds. Calculate the Btu. If you have a 40-gallon water heater, that is 40 multiplied by 8.33, or 333.2 pounds of water. So you need 333.2 Btu to raise the water 1 degree Fahrenheit. However, most areas need more than one degree of heat added to the water to make it warm enough for showering or washing clothes or dishes.