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Hi, sorry for the delay in reply - have been busy tinkering with the system. thanks for the info have been looking at the areas you suggested - I ruled out the radiators as the problem now only seems to occur when the hotwater part of the system is running and only starts to gurgle/bubble...

Hi, I have an open vented heating system with a Stelrad ideal wlx + grundfos 15-50 pump. When the system starts each time there is a gurgling rushing water sound until it gets going. when the system is up and running there is occasional gurgles (like blowing down a straw into a cup of...