| 摘要 |
PROBLEM TO BE SOLVED: To reduce an influence of a foreign matter mixed within a warm water circuit as much as possible with a simple constitution in a floor heating system having the warm water circuit. SOLUTION: An expansion tank 210 has a dust collecting recess 264 having a front wall 262, a bottom wall 263 and an oblique wall 264 at a bottom near an outlet 255. Thus, the foreign matter mixed with water in the warm water circuit is gathered in the recess 264.
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