can i use a variac to control a melting furnace

Yes looks like buying the controller will be the best way I didn't know they were that cheap
 
Seriously, if you can read chinglish, you can have a PID autotuning TEMPERATURE CONTROLLED (as opposed to power controlled (dimmer circuit or variac) or uncontrolled) solution for less than it costs to take a family of 4 to an all-you-can-eat buffet for lunch.

http://www.ebay.com/itm/Digital-PID...931?pt=LH_DefaultDomain_0&hash=item4165b39043

http://www.ebay.com/itm/K-type-High...964?pt=LH_DefaultDomain_0&hash=item233dffc254

Thats all you need right there

That's an excellent choice of PID. I've been waiting to find one with those features at such a reasonable price, and a solid state relay that handles 25A. Plenty for my 110V kiln.
 
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