铜管是contractor A带来的，我们没能看见上面的蓝色或红色label。 找了记录，没找到相应信息。也没人问过我们要用L还是M。因为焊接有明火和异味，门窗打开，很冷， 所以焊接时也没靠近看。网上说M的热水管加硬水更容易漏。我们这个地区都是硬水，我们这次漏的也是热水管！！不过这会不会是以后长期的问题， B说漏是因为A虚焊，那个弯头太难焊了。
太谢谢你的专业指教了！
下面是网上关于M铜管容易漏的描述：
“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.”
