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It LOOKS like a good deal. You notice it dosesn't have fitting on it, right?
I'd probably go for something with three rows of interior loops than just two. I bought a 20x20 last year from the seller "Freeheat4U" on ebay. He had fast shipping and a quality product.Here's an 18x18 three row for $1 more than the one you listed with free shipping:http://www.ebay.com/itm/OUTDOOR-WOOD-FURNACE-BOILER-HEAT-EXCHANGER-18X18-/150590454326?pt=LH_DefaultDomain_0&hash=item230fe3fa36