Yes, turning off a leaking hot water heater is an absolute necessity for safety and damage control. You must immediately shut off the electrical circuit breaker for electric models or turn the gas control valve to "OFF" for gas models to prevent fire and electrocution hazards. Simultaneously, close the cold water inlet valve located on top of the tank to stop incoming water pressure and halt ongoing flooding until a professional plumber arrives. Verification: Verify that both power and water supply to the unit are completely deactivated.
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