No, shutting off the main water supply to your house will not damage your water heater, provided you also take proper precautions regarding its power source. If you turn off the main water supply during a plumbing repair or water outage, you should also shut off the electrical circuit breaker or gas control valve on your water heater. This prevents the tank from partially draining through back-siphoning, which would expose and burn out electric heating elements or cause overheating. Verification: Verify that the water heater's power is deactivated whenever the main water supply is turned off.
1 votes
Marked as accepted