Yes, gas flow shuts off automatically if the pilot light goes out on a modern water heater. When the tiny pilot flame extinguishes, the safety device known as a thermocouple cools down rapidly, loses its electrical millivolt signal, and triggers an internal spring-loaded safety shut-off valve that instantly stops all gas flow to both the pilot burner and the main burner, preventing dangerous gas accumulations. Verification: Confirm that the main burner fails to ignite and gas is completely cut off when the pilot goes out.
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