I actually run my set up in the same way. I have a Herpstat 2 powering two 120 V six outlet surge protectors that leads to the flexwatt tape. The 11" flex watt tape has a voltage rating of 110V and is cut to the same length for each tub. In the event of a short, the surge protector will shut off power to the flexwatt tape. You have to use dimming and not pulse heating on the Herpstat though.