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o.k. thanks to all that replied in a manner befitting the human race unlike the first guy, whose not even worth a second mention - however I don't think anyone has tried to answer my question about the air locks etc. Everyone has been too tied up talking about a different topic. None of you...

Thanks, Bambergaswipe, glad to see your upholding the general publics view of those in the plumbing trade. I see not all posts on here are from plumbers, as people are trying to do things themselves, and they still seem to find advice. I was hoping people genuinely interested in helping others...

Hi all, I recently installed an unvented indirect hot water tank in a gravity HW, pumped CH system. I changed HW pipe from 28mm to 22mm a metre or so after the boiler(Potterton e60) as tank required 22mm. CH works fine, but HW from boiler doesn't reach tank. I'm suspecting an airlock, but...