MGB Series Boiler ,   Model: MGB Additional Information The MGB Series offers a selection of nine cast iron boilers designed for chimney-vent applications. MGB boilers incorporate an advanced combustion design using atmospheric burners. Choose an optional electronic ignition with standard vent damper and the MGB delivers fuel efficiencies up to 84.1%. Design and packaging features make the MGB easy to install and maintain. An integral draft diverter allows installation of the MGB in areas with only 4 feet of ceiling height. Efficiency: Mid-Efficiency Capacity: 50 - 299 MBH Heat Exchanger: Cast Iron Combustion: Atmospheric Venting: Vertical Vent Boiler Type: Hot Water Brochure 240005083 - MGB Rev. 9/09 416.9 kb Installation & Operation Manual 37611601 - MGB Rev. B 2.7 MB 37612401 - MGB Wiring Addendum Rev. 4.0 5/04 64.9 kb Other 240007867 - MGB Metric Orifice Change Rev. B 417.8 kb Product Bulletin MGB Pilot Change Product Bulletin 7808 53.3 kb Service & Technical Guide Utica Radiation Tables 69.8 kb Service Bulletin MGB Crate Change 201.4 kb MGB Pilot Orifice Change 132.5 kb Specification Sheet 240005816 - MGB Rev. 1.0 679.8 kb Warranty 1595005 - MGB Rev. 3.0 31.7 kb