I've heard in multiple places that you need to elevate it? But I'm still new, so I really don't know.

I put the probe between the Flexwatt and the tub and things are better. The thermostat is set to 99, hot side temp is 91, cool side is 78. So I'm approaching ideal temperatures.

So should I now put the tub on a flat surface? Should I insulate the cool side a bit? Does anyone else have an 8 degree difference between thermostat reading and actual temperature? Other suggestions?

Thanks!