I have 2 3-inch heat tapes running under the plastic tub close to one end of the long side. They're separated by about 1" of space so it's kinda like 7 inches of heat tape underneath 1/4 of the 28" long tub.

I just reread what I wrote above and don't know if that made any sense. Hah!


I use a pulse thermostat. Yeah, I wouldn't trust a rheostat on a rack.