UNUSED 10,761 Sq. Ft. Horizontal Heat Exchanger. CS Shell rated 150 PSI @ 420 Deg F. 304-SS tubes rated 700 PSI @ 420 deg. F. Shell: 3'10" dia x 53'7" L. 1158 Tube Holes - .75" dia tubes X 47'10 L. 1 Pass Shell. 2 Pass Tubes. Shell Nozzles: 10", 18", 20. Tube Nozzles (2)16". Built by Heat YUBA, MFG 2011. S/N: WUH/700.110493/1A. NB# 8679. Built to be used as LP Feed Water Heater.