Used 9,000,000 BTU/HR Gas fired Vaporizer Boiler, 150 PSI @ 600 Deg F. 2918 Sq Ft total Heating Surfasce. Built by Riley Stoker 1970, S/N: 3601, NB# 2317. Unit comes with 316-SS Centrifugal Pumps (#4967). 10" x 140'H CS Column (#4966) available at additional price.