On a typical waterbed, the heater (just a plastic heating pad) lies on the plywood next to the temp probe, a thin vinyl liner goes over that, and then the vinyl waterbed mattress sits right on that. No metal or foil at all. It's about 24" x 12" long and without any heat spreaders or currents it heats the whole king size waterbed just fine. You shouldn't need any foil or metal on the heating pad...
just a fyi...
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"Suntan lotion is not a lubricant!"
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