Awesome project! Caught my eye since it's on a 110v system, and got my brain thinking (which according to swmbo means uh-oh, project, money, and time lol).
I have a corner of a spare room in our place to take over, and using 1 pot instead of 3 would just be perfect for me. However, I did 1 extract kit so far and got kicked out of the kitchen, so would this be viable to mix the extracts, or would the heating element prevent doing that? Also, to provide the main 110v, did you cut an end off the extension cord you keep bringing up from an outlet, or did you "skip" the outlet and use the wire straight from a breaker?
Either way I'm already thinking of ways to implement a system like this since I just like doing tech related stuff. Woosh, back to the drawing board!!!