| 摘要 |
PROBLEM TO BE SOLVED: To restrain an abnormal pressure rise of a heating target fluid to be heated by a heat pump unit.SOLUTION: In an inlet joint 43a of a supply hot-water passage 42 through which supply hot-water (a heating target fluid) to be heated by a heat pump unit is distributed, a lid member 45 (a breaking plate) is disposed which is broken when a pressure within a water circulation circuit 40 formed with the supply hot-water passage 42 rises up to at least predetermined pressure. In this way, when the pressure within the water circulation circuit 40 rises up to at least the predetermined pressure, the lid member 45 is broken to release the pressure within the water circulation circuit 40 to the outside. |
