The woodstove heat exchanger is about 4x2x15 inches, stainless steel
rectangular tubing. I think the Holly Hydro Heaters in Petaluma CA still
makes them, and Real Goods sells them. Another manufacturer may be:
Hydro-Coil Mfg. Co.
14340 Dandee Hill Road Grass Valley, CA 95945 916-272-4904
The flat plate absorbers were made with a product called Thermfin - no longer
made. They are copper with black chrome selective surface.
Marc
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