| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat insulation pipe which prevents a polybutene pipe from being frozen in a cold district in winter and facilitates replacement repair if the polybutene pipe is frozen and broken.SOLUTION: There is provided a water/hot water feeding pipe 20 including a running-water pipe 21 made of synthetic resin, a heater pipe 27 which is apposed with the running-water pipe 21 and connected directly to the running-water pipe 21, and into which a heater wire 25 for heating the running-water pipe 21 can be inserted, and a heat insulation pipe 29 which covers the running-water pipe 21 and heater pipe 27 so that an inner periphery comes into contact with an outer periphery of the running-water pipe 21 and an outer periphery of the heater pipe 27, the heat insulation pipe 29 internally having a space formed of the outer periphery of the heater pipe 27, the outer periphery of the running-water pipe 21, and the inner periphery of the heat insulation pipe 29. |
