Yes, you must immediately turn off both the water supply and the power source to a leaking water heater. If you have an electric water heater, flip the dedicated circuit breaker to the "OFF" position to prevent dry-firing and severe electrical hazards. If you have a gas water heater, turn the gas control valve to the "OFF" or "PILOT" position. Simultaneously, close the cold water inlet valve on top of the tank to stop incoming water pressure and prevent further indoor flooding. Verification: Confirm that electrical power and water pressure are completely cut off.
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