Used 18.1 MMBTU/Hr Hot oil boiler. Manufactured by Heatec. Model VHCI 10010-50-G-(D). Input 22.1 MMBTU/hr. Flow rate 1465 GPM. Transfer media Dowtherm. Heating surface 1521 Sq ft. Design 300PSIG@750F. Outlet media 528F. Pressure Drop 12.9 PSIG. 125HP Blower. Economizer 2.5 MMBTU/hr. 300 PSIG@750F. Heating surface 2324 Sq ft. Pressure Drop 1.34 PSIG. Stack. Contols. Built 2011.