銅管是contractor A帶來的，我們沒能看見上麵的藍色或紅色label。 找了記錄，沒找到相應信息。也沒人問過我們要用L還是M。因為焊接有明火和異味，門窗打開，很冷， 所以焊接時也沒靠近看。網上說M的熱水管加硬水更容易漏。我們這個地區都是硬水，我們這次漏的也是熱水管！！不過這會不會是以後長期的問題， B說漏是因為A虛焊，那個彎頭太難焊了。
太謝謝你的專業指教了！
下麵是網上關於M銅管容易漏的描述：
“Type M copper pipe is more susceptible to leaks in hot water systems compared to Type L or K due to its thin wall thickness
. While rated for potable water, its, lighter, thinner structure can lead to premature pinhole leaks, particularly when exposed to high temperatures, high pressure, or, on some platforms, acidic/hard water conditions.Why Type M Leaks in Hot Water:
- Thin Walls: It is the thinnest of the common rigid copper types, making it less durable over long-term, high-temperature use.
- Corrosion/Pinhole Leaks: Hot water, particularly when combined with hard water or a pH imbalance, can cause, as some users on Reddit and in articles like NuFlow explain, pinhole leaks and pitting corrosion.”