Heating tube composed of heteromorphic words

摘要

PURPOSE: A heating pipe having non-circular shape is provided to enlarge heat emission area since bent portions are circular and emission portions are flat. CONSTITUTION: When a rearward-bent heating pipe(10) having non-circular shape is connected to a forward-bent heating pipe, the expanded part(4) of the straight line of the rearward-bent heating pipe is inserted into a bent portion(3) of the forward-bent heating pipe. Two heating pipes are consecutively assembled, since silver solder is circumferentially welded using gas. A flat portion has a large heat emission surface and a small cross section, thereby reducing the amount of necessary hot water and the capacity of a boiler.