I do not know how the installations in the USA are done. In Germany gas heaters and ovens must have a device that shuts off gas flow when the pilot flame is out. The device does not depend on electricity. Itīs often operated by a bimetal strip. Turning back on NG does not cause any issues with those installations.
But there are so many old stoves and gas ovens that do not have them. The main 200bar gasline will not even be shut off here for a leak, untill a diversion has been placed, so the gaslines will hold pressure.
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