Abstract: The present invention is directed to a heating apparatus having a burner and a heat exchanger coupled to each other. The burner includes a single piece integral cylindrical casing in which a burning mechanism, a motor fan and a fuel supply pipe are contained. A first cylindrical member is disposed within the cylindrical burner casing, and couples the burning mechanism, the motor fan and the fuel supply pipe to one another. The heat exchanger is formed by double cup-shaped members, and defines a first path for a heat medium and a second path for combustion gas of the burner. The heat exchanger is provided with a heat medium inlet port linked to the first path, a heat medium outlet port also linked to the first path, and a combustion gas outlet port linked to the second path. A second cylindrical member surrounds the burning mechanism and is releasably secured to the first cylindrical member at one of its axial ends.