I thought about heat gain/loss and figured I would still keep it in some sort of cabinet. I could line the cabinet with polystyrene fairly cheaply to insulate as well as keeping critters out. It is a finished garaged, completely drywalled and painted.... rarely is there a car in there and no kids.
Side door stays open all the time to allow the damn cat in/out so ventilation isn't poor.
Still toying with the idea but if everyone is in agreement that this is a poor idea I will dump it and deal with the under-the-stand business. I was so excited to think of running that crap through the wall.... endless space in the garage for easy maintenance, less water mess and salt mess in the house, not spending time on my knees with my head stuck under the tank... etc, etc, etc.....
Oh well... a bad idea is better than no idea.... at least it says I am thinking. | 
