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Old 07-04-13, 12:03 PM   #27
thumperoo
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Join Date: Jun 2011
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You'll notice that those turbotec coil-in-coil have the outside tube in steel and the inner "swirled" copper tube. The refrigerant is not in the copper inner tube - its between the two tubes - better heat transfer. And they're probably cheaper, less hassle than fabricating annealed copper within pex. $32 !!!!
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