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Someone must be able to offer some advice - please

Thanks for your almost immediate response, Would you expect an air lock in the boiler or elsewhere. I have two drain off points, one just above the bolier on the 22mm return pipe and a lower level one on the ground flor rad feed pipes. I know this is basics but can someone run throught...

Hi, I have an old system fitting in a 3 bed house comprising of; 4 downstairs rads, 4 upstairs rads, indirect hot water cylinder in the 1st floor bathroom together with cold water storage mounted above, CH F&E tank located at ground level in loft. CH Pump located under floor boards of...