A pipe heating apparatus for heating pvc pipe to facilitate bending. The damping tube is provided at the base end side of the conduit, in which the pressure sensor is located at a position where a temperature is elevated by heat from the combustor to a temperature equal to or above a boiling point of water at a concerned gas pressure. The system further comprises one drain plumbing section connecting the Nth growing unit to the first growing unit, so forming a closed loop of N growing units linked by N\u22121 supply plumbing sections and the drain plumbing section; and an electronic cyclic sequencer. The portable exercise seating device is comprised of any pliable material or combination thereof so that it can be folded or rolled into a smaller size for storage and portability. When the external force is missing, the locking device returns to a normal locking position by the spring force of the piezoelectric device. The PCB has a transformer mounted thereon, and the communication cord electrically connects with the PCB.