Ditto what Agent73 said...
I've used the RBI CB70 3-tub rack for 3+ years, and the two strips of 3" flexwatt (belly heat) do a great job of keeping the warm side toasty in all three tubs. A Herpstat t-stat keeps the warm side 92-94F and the cool side maintains 80-82F.
In the winter when the temps drop really low outside, I use an oil-filled heater to supplement ambient temps in my snake room. Very satisfied with the performance of the RBI rack with two strips of 3" flexwatt.
Good luck
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