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Water surge sound when ""zone Valve opens""
Hey guys, When my hot water boiler circulating pump kicks on I hear a quick big water surge sound, then quiet after that.. I don't hear the water going through the pipes like air being trapped at all just a Quick surge sound " like a office water tank " would make when you get a cup of water. What is causing this ?
EDIT : Its more from when the ZONE Valve opens and not from the pump that I get this big surge sound.
Thanks for any help !