I keep getting calls about bonding metal gas piping from contractors who tell me that the inspector is telling them to bond the gas system to the grounding electrode conductor or the grounding electrode, and they want to know if it is OK. Those are two of the methods that are permitted to be used but they are not the only ones you can use. In 250.104 B (1) allows the equipment grounding conductor from the branch circuit that is feeding the gas appliance to be used and that would be all you would have to use no other Bonding required. See the slide below where a branch circuit is feeding a gas heater in an air handler. This circuit could be for the fan motor or the gas restrike it doesn’t matter as long as it has an equipment grounding conductor. Note that the section states any of the following methods 1 through 5.
Till next time be safe work safe
Jake