The flexwatt touching the tub will transfer plenty of heat into the tub.
My room is about 75 and my hot spot is 95 and my ambient temperature is about 87 on the warm end and 78-79 cool end.
If the flexwatt isn't creating that 87 degree ambient temperature then what is and why is the cool end of my tubs 3-4 degrees warmer than the rooms ambient temperature?
If it was that cold in a room I'd use 4 inch for the ambient under the cool end and use 11 inch under the hot spot and control them with 2 thermostats.
I'd also be using closed racks or enclosing them if I had open design racks.
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