Yes, the pilot light on a standard gas water heater stays on when electrical power goes out. Traditional gas storage tank water heaters operate entirely mechanically using gas pressure and a millivolt thermocouple system, requiring zero electricity from your home to keep the pilot lit and heat water. However, modern power-vent gas water heaters require electricity to run an internal exhaust blower fan; if power fails, these units shut down completely for safety. Verification: Check whether your gas water heater model is a standard atmospheric vent or a power-vent unit.
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