Physically resetting an electric water heater by pressing the red high-limit thermal reset button takes only a few seconds. However, after resetting the switch and restoring electrical power, the water heater requires between 30 to 60 minutes to actively reheat the entire tank of cold water back to your set operating temperature. The exact recovery duration depends on the tank's gallon capacity, whether it is gas or electric, and the wattage of the heating elements or BTU output of the burner. Verification: Check the hot water temperature at a nearby tap after waiting 45 minutes.
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