| 摘要 |
PROBLEM TO BE SOLVED: To improve the sealing property of a cistern tank. SOLUTION: A cistern tank 10 for a heat source machine is provided to reserve temporarily hot-water, heated by a heat exchanger. The cistern tank 10 is provided with a water pouring port 28, projected from a projected port 23 provided on the ceiling plate 25 of an instrument and a water pouring cap 24 is mounted on the opening of the same, while a packing 30 for the water pouring port, having a projected flange unit 30a for covering a gap between the projected port 23 and made of an elastic material, is mounted on the opening rim unit 28a of the water poring port 28. According to this constitution, the sealing property of the water pouring port unit 28 is improved whereby antifreeze liquid, leaked out of the water pouring port 28 upon supplementing the same, hot-water, overflowed from the inside of the tank 10 due to thermal expansion, rain water from the ceiling plate 25 or the like is prevented from invading into the machine through the gap of the projected port 23.
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