Moved into new house a year ago and noticed that the system was quite noisy, especially with water and rads on - there was a metallic squealing noise from the pipes just before switch off. Now the hot water system has got so noisy the radiators around the house wake me up, and they are not even on! There is a "boiling water" sound for about one minute, which gets increasingly louder and is transmitted to all the pipes and rads, then a "clunk" as the thermostat stops the heating, then it goes quiet. This is repeated every 5 minutes or so. I turned the pump up to max flow, but no change. I have a gas fired boiler Balmoral 65F, with the thermostat turned to minimum as this makes it a little quieter. I tried draining the system and added cleaner, but very little difference. This is getting worse - what is happening ? Please help!
Thanks
Thanks