The Buderus G115WS is an oil-fired cast iron boiler with an efficiency of 87% AFUE. It is constructed of flexible GL-180M cast iron which resists thermal shock during rapid temperature change. A modified three-pass flue design provides lower stack temperatures and higher efficiency, while a full 3″ jacket of thermal insulation around the entire block increases efficiency by lowering standby losses. A full swing burner door and front access plugs are designed to allow easy servicing of the unit.
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