Quote Originally Posted by coreydelong View Post
I would rather see you run all 13 tubs in a series... just like it was a 13 tub rack. I could then see running it off one t-stat probe if you pay close attention to your tub temps with a heat gun.

You just need a short 6-8ft extension cord to wire the two racks in series instead of parallel like your diagram shows.
You can't run heat tape in series. That would mean cutting the voltage to each section of heat tape. All heat tape and racks are wired in paralell, the only thing that changes is how sections are wired. Some people use seperate pugs for each section then plug them all into the same power strip, for example. Others (me included) wire them into one plug per rack. some use one long section of heat tape snaked back and forth through the rack, but I'm cheap and like to save the 6"-8" of tape per shelf.