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Your water heater won't overheat. It's only an issue if the water level in the tank drops below the level of heating elements. The only way that can happen is if you drain the tank. There's a very slim chance you could siphon some water out of the tank if you open a faucet that's below the level of the tank. That said you shut the power off to the water heater by turning off the breaker for the heater in the main breaker panel. It should be a 30 amp breaker assuming you have a 30 gallon or larger tank. The breaker should be marked "water heater"