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post #2 of Old 08-19-2010
hellosailor
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Jeff, plastic just doesn't transfer heat well.

There are a number of heat exhangers and radiators built using plastic caps (top caps or end caps) but AFAIK the actual tubing is still going to be metal simply because it transfers heat SO much better.

With the right metals and an adequate zinc, corrosion should not be a problem.
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