Patent ID: 7143823

Claim:
A heating panel, comprising upper and lower plates integrally formed to face each other so as to form an inner fluid pathway in which heating water flows; a plurality connecting members, each symmetrically extending from the upper and lower plates toward the lower and upper plates, respectively, and connecting the upper and lower plates to each other; the inner fluid pathway formed inside of the plates by means of the plurality of connecting members; and two fluid communication portions for supplying and discharging the heating water, wherein one or more connecting members adjacent to the fluid communication portions are punctured such that punctured portions of the connecting members are fastened to each other by means of bolts and nuts, wherein the heating panel is manufactured by way of blow molding of a thermoplastic resin and further wherein upper and lower portions of the inner fluid pathway, where the connecting members start to extend from the upper and lower plates, are rounded, and the upper and lower connecting members are formed with a groove structure, in which the upper and lower connecting members are depressed at a circular-shaped periphery of the bottom plane of the upper and lower connecting members, so that the upper and lower portions of the inner fluid pathway form a circular or elliptical shape.