As long as the FlexWatt or whatever else you use for a UTH is regulated by a thermostat it should not overheat. PVC is pretty thin so heat goes right through it, and the UTH shouldn't top 95*F if regulated properly.
Also think about enclosures that are stacked but each has a UTH; most people don't put an air gap between them.
If the ambient temperature in your house is cool then definitely get both the UTH and RHP for the enclosure. In the summer you can always turn off one appliance if you find you don't need it.
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