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Old 11-02-18, 11:24 PM   #6
Supreme EcoRenovator
Join Date: Jan 2010
Location: elizabethtown, ky, USA
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Looks like a heat pipe / evacuated tube collector that thermosiphons heat into a batch tank. Very effective and not expensive. Average Americans dislike them because they aren't invisible. Many interested homeowners are dissuaded by their picky neighbors.
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