Well its just a good question.. I plan to build one of these soon and want to keep informed.
I was also going to email http://www.stilldragon.com/diy-controller.html for more info on the specifications to this build like, what are the parameters for the potentiometer and I am assuming that its a 40 amp ssr. I did not see this info listed on the link given.
What about some kind of breaker?
Beauty lies in the hands of the beer holder
Kegged: Centennial Blond
Bottled: Mambo in your mouth, Cranberry mead, Peach Ginger mead, HopSlam, Citra DIPA