Yes. Flexwatt heat tape is the most efficient to an extent.
As long as your room temp runs at least 75 degrees, flexwatt works great. It doesn't do such a great job in a room with lowered temps. It will run at a much higher temp to achieve the set temp when the room is cold.
For example, it could take the flexwatt to run at 130 degrees to reach a 90 degree hot spot in the tub in a cold room. That isn't safe or efficient. Flexwatt isn't designed to run over ~100 degrees, so you're risking flexwatt malfunction at that point.
Another option is just heating the entire room as the previous poster said.
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