Used American Heat Reclaiming Spiral Heat Exchanger System, dual zone, 780 sq. ft. total surface area, top unit is 60 sq. ft., 304 stainless steel, 50 PSI and full vacuum, Serial No. 12463, Model 2-VH, National Board No. 9704. Main unit is 720 sq. ft., 304 stainless steel, 50 PSI and full vacuum @ 200 °f, Serial #12464, Model 3C, National Board 9705, complete with elongated bottom head, Year 1977, OAD 40" D x 158" L.
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