Yes, you should immediately turn off the power supply to your water heater if your home loses its main water supply. If municipal water pressure drops or pipes are shut off, your water heater tank can drain partially through back-siphoning. If an electric water heater's tank empties while power remains active, the exposed upper heating elements will overheat rapidly, burn out instantly, and create a severe fire hazard. Verification: Flip the dedicated electrical circuit breaker to the "OFF" position or shut off the gas control valve immediately during a water outage.
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