Quote Originally Posted by westom View Post
Arcing does not create an imbalance. But again, is it a GFCI or an AFCI? AFCI would assume arcing is a failed extension cord - cut off power.

Semiconductor switching would eliminate arcing using techniques such as switching on zero crossing (so as to not create excessive heat). Also necessary are numbers for that heater and for switch rating. Switches that cut off more than 1 amp will arc. But a switch is designed to minimize that arc and to not cause contact damage. Snubbing will not eliminate the arc - but will significantly reduce destructive effects.

If a GFCI trips simultaneously with arcing, then current is going somewhere else - where it should not be going. GFCI would be tripping as designed; reporting a potential human safety issue.

Line filters are expensive? What is expensive - a number required?

https://www.google.com/url?sa=t&rct=...68rtmX327KQOjg
Semiconductor switching of course is best solution but has its own problems with heat output and is not something that can be added to correct the problem with the thermostat they already have.

Usually arcing occurs when the contacts are broken so that would be good info to know. If it trips during release (when the power is turned off to the heat).

Your link to line filters is for components and not a plug in solution. I was thinking more towards line conditioners that would be a plug in solution and may have built in line filters and such.