With a standard 40-gallon storage tank water heater set to 120°F, you can typically expect approximately 30 to 40 minutes of continuous hot water usage under normal shower flow rates (around 2.0 to 2.5 gallons per minute). Because incoming cold water mixes directly with stored hot water inside the tank as it depletes, usable hot water volume diminishes gradually. Once exhausted, the unit requires roughly 30 to 45 minutes to recover and reheat a fresh tank of water. Verification: Monitor shower duration and test recovery time to evaluate tank efficiency.
1 votes
Marked as accepted