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$K into my system with "steam experts" and minimal improvement
So far, I've had all the accessible copper pipe replaced, main vents replaced with big expensive ones, pipes insulated, skim port installed, and radiator steam vents replaces. I'm still getting significant water hammer and hiss from the radiators. Insulating the pipes and replacing the main vents provided ZERO improvement. I get a small amount of improvement for a short time when I drain and refill the boiler, but the issues return with a few hours.
FYI - all the work has been done by preferred vendors from this site.
If the system was not properly maintained before I bought the house, can it be permanently ruined? One thing I've noticed is that the there seems to be crap in the boiler water. The sight glass has crud inside it and when I drain the boiler, the first quart or so of water seems to have gunk in it, then it looks like normal, tea colored boiler water. I checked the boiler for a leak. No leak. Can there be other problems with a boiler that cause a noisy system?