If that was in his "help me make this" thread, I believe he said he sold the flat plate hx's for a profit. Then he bought the oversized coaxial exchangers with the money. Since you will be using pond water, the coax exchangers would be highly preferred over brazed plate. Pond muck and plankton will quickly foul a brazed plate hx to the point of excessive pressure drop unless you use something like a sand filter in your source line. With a coax coil, you may only need a strainer screen or a sock filter to keep it happy. If the coax filter gets clogged, you can blast most of the silt and crud out with air. Since the flow is not divided, all the current can flow straight through at high turbulence and velocity.
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