cheap HEs
Great project!
If you're looking for easily made inexpensive exchangers, I use a coil of refrigeration copper tube which I turned into a similar size coil of poly pipe with copper fitting adapters on the ends, see pics. Mine was 3/8 copper inside 3/4 poly and the 3/4 copper pipe at the adapter ends if sharpened would just fit inside the poly if the poly was warmed.
Use pex if you need it for hi temp.
The copper coil feeds easily into the slick poly and in an hour you can have any size exchanger you want and easily resize it.
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