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we are in northumberland which I think is a soft water area,I don't know about any inhibitors in the system.I think i'm going to try to turn the temperature down but leave it on continuous ,this should keep the circulation going and stop bubbles forming?. worth a try anyway. John

Thanks for the replies. The boiler is a Baxi inset 2 Back boiler,I think it must be gravity fed as there is no pump I can see just two large pipes going to the cylinder in the loft,the pump only runs when the heating is turned on. John

Hi everyone ,new here,hope someone can help When my boiler first fires up (After being off for some time-overnight), there are banging noises like air in the pipes,for the first 10/20 seconds,this is when the controller is set to h/w only, so I guess that must count out the heating?.When the...