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I have a 75 year old, oil fired, American standard, steam boiler. What are the proper steps to flush it out. There is a valve at the bottom most part of the water pipes that the technician pointed to and said ," that is the flush valve".
Next to this boiler is a hot water holding tank. It also has a valve at the bottom of it.
I have a garden hose and there is a slop sink in the basement.
What is the correct way to flush out this old, filthy rusty water, boiler?
73 year old one pipe system with original American standard boiler, oil fired becket, 2 inch steel pipe main, 100 feet long, with 8 radiators above.