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Fair comment Tony and thanks for taking the time to reply. I guess I'd better get a plumber out to check the system over rather than messing with it myself. :)

Hi all, Having lurked here for a while and seen some of the geeat advice given on here thought I would try it out for myself. My situation: Newly bought house with gas central heating using a Potterton Nettaheat gas boiler. Hot water works fine and central heating is good....but only if...