A gas water heater pilot light is engineered to stay lit continuously 24 hours a day, 365 days a year whenever the water heater is in active service. It can remain lit safely for many years without interruption, provided the thermocouple, gas supply, and venting systems remain fully functional and uncompromised by drafts or debris. The pilot light only extinguishes when forcefully blown out, starved of combustion air, or shut off manually. Verification: Inspect the lower combustion chamber sight glass periodically to confirm a steady blue flame.
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