going to plastic today...couple of ?'s

ok..I'm setting up a rubbermaid today. I have an 11X23 UTH for it. The tub measures 37 inches. Here are my questions. WIth the UTH directly on the bottom, can I set this whole tub directly on a stand, or does it need to be raised to make a pocket of air? With room temp at a constant 75, will this single UTH heat the ambient air temp in the enclosure adequately? Thank you

You can sit it where ever needed.. The UTH may or may not raise the ambient temps to where you need them. You will really ahve to try it out and see what happens:)