Ah
agreed just keeping the whole room warm just supplying a warm spot would be my first option also and is kinda how I have it but if the orignal poster is only going to have one tub on the floor not a rack from my personal experience of this exact scenario is a pain it the butt. If it is directly on carpet no under tank heater is it is hard wood it gets darn cold and drafty. Then a temp difference on anything smaller than the 34qt is almost unnoticeable. If you heat the side of a 18 inch Tupperware it gets the whole thing warm.