| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchange tank having warm water-resistance, and excellent fracture strength with standing supply and discharge of water even when constitution parts or the like for warm water temperature detection and heat supply are attached to the heat exchange tank as a member made of copper or heavy metal. SOLUTION: Constitution parts made of metal member such as copper are attached to a hollow molding made of pollypropyiene resin to form the heat exchange tank. At least one layer is put between the hollow molding and the fitting fixing part of the fitting constitution parts so that the hollow molding does not come into direct contact with the fitting constitution parts to prevent the contact of the heat exchange tank molding with the constitution parts and isolate the both from each other.
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