You can use THG heat tape on a dimmer to accomplish what you are talking about. However it will not hold consistent temps like it would with either an on off T-stat or a Proportional T-stat. The On Off T-stat will hold temps fairly well by the time the heat gets threw the tubs and substrate a split of 1-2 degrees will not show up as much if you attach your probe to the THG heat tape between two tubs or just on the tape itself. I personally would not use a dimmer on heat tape failure rate is a lot higher than an On Off T-stat. I have used both style T-stats with the new THG heat tape and been happy with both.
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