Solid fuel boiler

A solid fuel boiler, comprising a fire place with a burner, a flue gas passage with a flue gas outlet, an inlet for cold air, a convection space for heat exchange of cold air with the flue gas passage, and an boiler outlet for hot air, wherein the flue gas passage comprises a tube kit with a plurality of tubes arranged adjacent to each other to create a flow space for air between the tubes, wherein at least one of said tubes is arranged so that it extends obliquely upwards in an angle in relation to the vertical line L of the boiler from a lower attachment point to an upper attachment point, and wherein said convection space is provided with at least one partition wall which is arranged to force the air flow essentially across the tube kit in such a manner that the air flow is forced to cross the tube kit at least twice.

A solid fuel boiler, comprising a fire place with a burner, a flue gas passage with a flue gas outlet, an inlet for cold air, a convection space for heat exchange of cold air with the flue gas passage, and an boiler outlet for hot air, wherein the flue gas passage comprises a tube kit with a plurality of tubes arranged adjacent to each other to create a flow space for air between the tubes, wherein at least one of said tubes is arranged so that it extends obliquely upwards in an angle in relation to the vertical line L of the boiler from a lower attachment point to an upper attachment point, and wherein said convection space is provided with at least one partition wall which is arranged to force the air flow essentially across the tube kit in such a manner that the air flow is forced to cross the tube kit at least twice, the boiler outlet for hot air is arranged in the lower half of the boiler in level with said fire place and the channels that connect the outlet opening of convection space with the boiler outlet, extend obliquely downwards, whereby the hot air flow is forced across the upper part of the fire place prior to exit via said boiler outlet.