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Flushing pipes and cast iron baseboard
My boiler is 60+ years old and has cast iron baseboard in a closed monoflow system.
I had a contractor bring up flushing in the process of preparing a quote for a new boiler. I'm not replacing pipes or baseboard.
The system has not run for a month or more so I drained a glass of water from the system drain and it was perfectly clear. After an hour nothing settled out of it.
I then ran just the pump for an hour and repeated the test with the same results.
Is this a fair test?
How else would I determine a need to flush?