Originally Posted by twinboat
You never switch the neutral wire.
Switching the hot cuts all power off after the switch. There will be no power in the wires to the device or back.
Switching neutral leaves power to the device and back to the switch. If that wire touch's ground, before the heater, it will burn back to the source.
Cut that stuff out, tap off a breaker in the panel and add a switch in a handy box and switch the black hot wire.
I never thought about that. I was just going with the original installation and tapped a hot wire for the led itself.