PURPOSE: To obtain a red heat temperature which serves to produce an excellent heating effect, by positioning the other end of the non-permeable cylinder, which is not in contact with a permeable cylinder, at a higher level than the lowest portion of the outer combustion cylinder while enabling small holes in the lower portion of an outer combustion cylinder to flow in air which is not controlled by a non-permeable cylinder.

CONSTITUTION: Small holes 5', 4' are perforated in a central and an upper portion of inner and outer combustion cylinders 5, 4. A diameter of the small holes made in the inner combustion cylinder 5 is 2mm or less, and the small holes in the outer combustion cylinder 4 is made in a larger diameter than that of the small holes 5' in the inner combustion cylinder 5. The other end of the non-permeable cylinder 6, which is not in contact with a permeable cylinder 6, is positioned at a higher level than the lowest portion of the outer combustion cylinder 4 so that flames are adhered to the small holes 6 on the side of the permeable cylinder 6' to provide a steady combustion. This allows small holes 4''' in the lowest portion of the outer combustion cylinder 4 to be kept from being subjected to the direct influence of a draft of a gap between the non-permeable cylinder 6' and the outer combustion cylinder 4, and permits a large amount of air to be supplied from small holes 4''' in the outer combustion cylinder 4 by the aid of a draft of a gap between the inner and outer combustion cylinders 5, 4. This permits the reliable blowhole combustion at the small holes 4''' in the lowest portion of the outer combustion cylinder 4, and permits the supply of oil gas staying around a wick 2 to the upper portion as a result of the gas being carried on a rising current of the combustion gas produced thereat.