Quote Originally Posted by MarkS View Post
Depends on how you want to run your heat tape. If you're running it down the back or down the sides the 12" stuff would be the way to go, if you're running it underneath the tubs the 3"-4" stuff is all you'll really ever need.
That's a good point. I was gonna go with belly heat. Just one long piece zig-zagged down each shelf. Somehow I don't see how a single strip of 4" belly heat would be able to provide enough heat for a 88+ degree hot spot AND a 78+ degree cool side. Especially since the cool side of the tub is 25-30 inches away from the heat source. 12" really seems like the way to go. A strip of 12" down each side might prove effective also. Maybe I should start a poll.