Well I guess what I am really trying to figure out is if back heat is ok when so many people use belly heat instead. The easiest way to do it seems to be running 3 strips of 11" up the back but I dont want to have any problems arising from it. Danegerous's rack apparently has 2 strips of 11" up the back, but I cant picture how it can be done to make the heat distributed evenly for all 3 tubs on each shelf. It seems obvious that belly heat is the best way to go but its so much more expensive. Even if I did all the wiring for each tub to have a pad, thats still 30 feet and all of the wiring supplies would add up. Sorry for not presenting a clear question.