BOILER WITH CASING PIPES

The utility model discloses a heating device of a boiler. The purpose is to provide a boiler with high heat efficiency. A boiler with casing pipes of the utility model is characterized in that a boiler barrel and a smoke box are respectively composed of an upper part and a lower part. The upper smoke box is positioned at the upper part of the upper boiler barrel. The lower smoke box is positioned at the lower part of the lower boiler barrel. An inner casing pipe and an outer casing pipe are connected between the upper smoke box and the lower smoke box. The utility model has the advantages of compact structure, small size, high thermal efficiency, etc. The use level of steel product is decreased. The fuel is saved. The boiler with casing pipes can be conveniently and quickly arranged. The manufacturing cycle is shortened.