Uth are a radiant heat source. (Same for rhp) the emit thermal radiation the thermal waves pass through air and water with out doing anything. When they hit a solid object they excite the molecules and generate heat.
The uth will heat the floor of the tub to until the thermostat probe shuts it off. The floor will in turn heat the substrate and that in turn heat the air. Follow?
The issue is 90 on the floor drops dramatically to the substrate and even more to the air. The end result is the most gain you should expect is a few degrees to the ambient air temps 1-2 maybe 3 on the outside. This still leaves you with an issue, at best your ambient temps will still be cool.
I would suggest a few degrees as a buffer. 75 being the coolest (constant) temp but I would add 3 degrees to be safe so 78 as a lowest constant temp ( short dips below are fine a few hours at 72 isn't an issue but a few days or more could become one.
The dual uth ( I run duals as well) hold the surface temps but make very little difference to the air temps. This means there should be a heat source that will directly heat air. Che or bulbs will do this, I don't believe Che are a good idea as they get crazy hot. This leaves bulbs the fluorescent light bulbs get warm with out extreme heat of tungsten. IMO safer. How to hook up something like this in a tub I am unsure of.
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