Abstract: A biomass boiler system for significantly reducing corrosion and creosote buildup within the interior of a fire container. The biomass boiler system generally includes a primary combustion chamber having an exterior surface and an interior surface, and a water jacket having an inner wall, an outer wall and a water cavity defined between the inner wall and the outer wall. The inner wall is distally spaced from the exterior surface of the primary combustion chamber forming an air chamber. The water cavity contains a volume of liquid heated by thermal conduction of heat from the primary combustion chamber through the air chamber then through the inner wall of the water jacket. The heated liquid may be used for heating, electrical energy generation or other purpose.