bsi138Bermuda Gas Fired Cast Iron Steam Boiler BSI series, Sea Level. BtuH Input: 138,000; Gas Type: NG; Sections: 5; AFUE: 82.0%; Flue Diam.: 6; Width: 19-14; HehtBERMUDA Gas-Fired Steam Boiler Desned for reliability, efficiency and performance. For residential ... ia, PA BSI SERIES - BERMUDA TECHNICAL SPECIFICATIONS CROWN