Used APV spiral triple-tube heat exchanger. 89 square feet of heating surface area. (4) 17 ft tubes, 4 in outer tube, 3 in centre tube, and 2 in inner tube. Tri-Clover fittings. With hot water controls, stainless steel centrifugal hot water circulation pump, (4) 2 in butterfly valves, and (2) 3-way product valves.
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