问候。我有两个问题。首先，所有排水热水器的建议都是先把东西关掉。我只需要把软管连接到排水阀上，在压力下排水5分钟。你为什么要把东西关掉?我从未这样做过，也从未遇到过问题。第二，假设你离开家，关掉了总水源，让热水器开着，没有动。现在，假设加热器突然泄漏了。当水耗尽时，加热器会尝试加热空的单元吗?是否会发生其他损害? Also, I've read where if that water in there is not sufficiently heated (people shut it off or turn it down) it could lead to Legionnaire's Disease and/or rusting issues. What's the deal on all of this? Plumbers I've asked seemed puzzled.
谢谢。
