Plymouth Water II Series Boiler ,   Model: PWB Additional Information Dunkirk's Plymouth Water (PWB) Boiler offers the best combination of heating comfort, efficiency, reliability and affordability making it one of America's Hottest Boiler Values. With efficiency as high as 81.6%, a Plymouth Water boiler is an outstanding choice for performance and low operating cost. Efficiency: Mid-Efficiency Capacity: 37.5 - 70 - 105 - 140 - 175 - 210 - 245 - 280 MBH Heat Exchanger: Cast Iron Combustion: Atmospheric Venting: Vertical Vent Boiler Type: Hot Water Brochure 240005052 - PWB Series Rev. 11/08 521.7 kb Installation & Operation Manual 14683002 - PWB Rev. 3.0B 292.6 kb Service & Technical Guide Dunkirk Radiation Tables 96.2 kb Service Bulletin PWB Crate Change Rev. 2/06 244.4 kb Specification Sheet 240005694 - PWB Rev. 1.0 495.9 kb Warranty 1595019 - PWB Rev. A 661.1 kb