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; HehtEven oftener it is hard to remember what does each function in Boiler Crown Boiler BSI138 is responsible for and what options to choose for expected result. Fortunately you can find