I just had a new boiler installed known as: The Prestige Excellence Series combined with a High Efficiency Condensing Stainless Steel Wall Mounted Gas Boiler with a built-in “Tank-in-Tank Indirect Fired Water Heater. 3 honeywell zone valves were used with the installation. Everytime the heat kicks on, I get a rumble from the pipes and a loud bang. Certain rooms I can hear the water flushing through until it warms up. I strapped down every pipe including the baseboards and it still hasn't helped. When the unit kicks on and I'm standing in front of the boiler, it sounds like a fast surge of water and then I hear the rumble in another portion of the house. I have turned the circulator pump down to the lowest performance and this has not helped. My plumber has bled the lines twice and it still happens.I was told by an hvac guy that my boiler is oversized... uld this be the problem? Any responses would be greatly appreciated.
Your need to purge the air from the lines. Consider having and automatic purging system installed
