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Adding 2 zones of Hot water baseboard heat to existing 2005 Burnham Steam Boiler

I'm a homeowner in need of guidance since the heating professionals we hired have not been able to resolve the malfunctioning boiler. We converted to a Gas Boiler heating system to service 1st & 2nd floor (steam radiators) and added forced hot water baseboard to Attic (zone1) and forced hot water baseboard to Basement (zone 3) when we added the hot water baseboard heat in the Attic and basement. Our heating issues started.

1. Loud Hammering and water thrashing noises in the Attic baseboard (Aqua Pex) when attic is calling for heat or when 1st floor calls for heat
2.On occasion when attic calls for heat, the 1st floor over heats
3. Basement baseboard has never worked.

Under the guidance of Plumbing & Heating professionals we have replaced numerous circulators, cleaning heating exchanger plate, then uninstalling heat exchange plate. We recently spent serious money having HVAC company re-pipe boiler to Burnham Specs as they believed was the root of the problem. Unfortunately issues persist. Greatly appreciate some guidance.


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