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I live in a 100 year old apartment building. We have a single-pipe steam heating system. This weekend, we had a pretty large leak from a cracked elbow for one of the steam lines. Steam would spray out when the boiler was on, and water would spray out when the condensate returned.
The plumber who came out to fix the problem shut down our boiler, turned off the water supply, and drained the system completely. He switched out the elbow in the line. Then, he turned on the water supply and the boiler simultaneously.
Here's my question: should he have waited for the tank to fill before turning on the boiler? He left after 10 minutes, and I turned the boiler back off, waited for the tank to fill, then restarted the boiler.
Is there any chance the boiler was damaged by this?