熱水爐子為了節能在進出口有heat trap來防止回流，其實就是個單向閥，時間久了就堵住了熱水出不來了，見視頻

來源: 徒勞於 2025-04-17 20:45:44 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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