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Thank you both for taking the time to reply. I do have valves on both sides of the boiler so I can isolate the boiler loop from the zones. I also have an expansion tank on the boiler and air bleeders, so I'll give it a try.

Hi All, I have a closed loop baseboard hot water heating system with two zones (one upstairs and one downstairs) in my home. The gas-fired boiler is in the basement. I don't have any air vents on the individual zones, just near the boiler itself. I am attempting to add boiler treatment/cleaner...