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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.
Speed of Recovery. The recovery time is the time the water heater takes to reheat its entire supply of water, and depends on whether the heater is a gas or electric model. A gas water heater will recover in half the time of an electric unit. A 40-gallon gas water heater can recover in about an hour.Recovery for a 40-gallon electric water heater takes about two hours.f your water heaterâs recovery time leaves you too often without your hot shower, you should consider replacing your 40-gallon unit with a larger water heater such as a 50- or 80-gallon unit. Another option is the tankless water heater that heats water only as it is needed.