Used Tranter Superchanger 1922.4 sq. ft. stainless steel plate heat exchange. National Board # 17495. Model EC7-237-2H. Serial # SC9850. Maximum working pressure is 100 psi @ 150 deg F. Minimum Design Metal Temperature is 30 deg F @ 100 psi. Heat exchanger has (4) 8" carbon steel flange inlets/outlets. Plates are stainless steel that connect to carbon steel ends. Built in 1993. Was used with a chiller system. Good condition.