Improved Natural Draft Biomass Cook Stove The present invention relates to an improved natural draft biomass cook stove that comprises an outer shell (2) and a top lid (3) positioned on the outer shell (2). Said outer shell (2) defines cylindrical shaped combustion chamber (15) that is opened at the fuel housing (9) and at the plate (4) of the top lid (3). The combustion chamber comprises a lower combustion chamber (15b) and an upper combustion chamber (15a). A grate (16) is positioned within the lower combustion chamber to receive a solid fuel. A draft controlling and mixing ring (17) is disposed in the upper combustion chamber for reflecting uncombusted gases into the flame so that smoke can be reduced and amount of heat can be elevated. Further, insulation filled between the outer surface of internal liner (10) and outer shell (2) impedes the heat to be dissipated in the atmosphere through exterior of the stove.
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