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Salty water on an aluminum/copper tray could be a short-lived arrangement. I'd stick with aluminum tubing for a surface rad. Zinc-based brazing is easy, and gives minimal galvanic action, still eating the aluminum. To get a sense of the size needed, imagine spreading out the innards of a standard rad. The surface rads on a snowmobile depend on a snow spray. The freezer compartments of old refrigerators might be unwrapped to lay flat.
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