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I fitted repo cast iron rads two years ago and from that day onwards there has always been a serious air bubbling issue around the pump to the extent that there's so much air, it takes ages for the rads to warm up. It's not air in the system due to lack of bleeding because if I run the pump...

Hi, I'm new here but not to DIY. Hopefully in future I can help others with my knowledge but now, I need your help. So, I have an open vented system with newish cast iron rads and suprima boiler. Ever since I've lived in the flat (3 years) I've had the following problem: 1. Pump...