The thing with two different tubs is they can give different hot spot temps depending on the thickness of the bottom of the tub. I don't think it makes much of a difference either way between the shorter rack and the taller. There will be some variation in temps just due to the fact that heat rises so tubs at the top will be warmer and tubs at the bottom will be cooler, but that's nothing new. Unless your temps are going to be at least 70 degrees inside without the heater, I would say yes you probably would have to run the heater year round.
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