Mike Up wrote:
Also, when we add heat trace to pipes at work, it does NOTHING unless there's insulation to retain the heat. Seems a heating pad won't work to well, without an enclosed and insulated underbelly to keep the cold off of the heating pad.
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I'm betting the heating element is right out the outside of the pad, on the top only, and touches the bottom of the tank. In that way all the heat is being transferred to the tank directly. I have a magnetic heater that I stick to the bottom of the oil pan on my farm tractor to keep the oil warm on the winter. It works quite well.