For my tubs, I don't have a rack yet so I have the tubs stacked with a UTH with a thermostat under the warm end and a shop light with a 75 watt red bulb in it, attached to the shelf they're on - facing the tubs - on the other end. I put it at an angle so that all 3 tubs get heat off of it because our place stays cool. This works perfect for me.
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