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My system is an open one, gas fired, 7 rads, grunfos super 4 pump and a worcester cbi boiler. expansion tank in loft. The system is I think, 20 years old, but we replaced the boiler 4 years ago. THE PROBLEM started about 4 months ago and is that the pump is very noisy when running, and the...

Hello!. First time here and looking for help. I have a Worcester gas fired boiler (4 yrs old) located downstairs, 7 rads, unsure of pump type. At initial startup, I get a rushing noise from the pump and de aerator which ceases after about 5 mins. 2 upstairs rads need daily bleeding, air has a...