No, a modern water heater will not leak gas if the pilot light goes out. Equipped with an automatic safety thermocouple and a spring-loaded gas control valve, the system instantly cuts off all gas supply the moment the pilot flame extinguishes and the thermocouple cools down. However, if your water heater is an extremely old model lacking modern safety shut-offs, or if the control valve is physically damaged, gas could leak. Verification: Test gas connections with soapy water solution if you suspect a gas leak.
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