[Christ]

Assuming they're using copper coils for the generator side of the setup, (I haven't looked into it... shame on me.) they could also be using a high-temp epoxy to seal the coils, which would resist melting at high heat. It's not hard to come by, honestly. I use it to seal up my dad's chimney cleaning door every year, since we only clean it out once a year, before the burn season starts.