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hi thanks for responses. its a combi system but not sure about closed or vented. how would i tell? thanks think i might call out british gas. thanks again

Hi I moved into my house this time last year and after a problem with a bent and broken rad pipe we had to drain the ground floor heating system. When our plummer went to refill it we had an airlock which had to be flushed out. We finally got the pump working properly but soon realised that...