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Thanks for your help. Assuming the expansion tank & vent pipe have the correct distances, what are the likely causes of air getting in the system?

I have recently had a new boiler installed, a GlowWorm 30 Hxi. The old boiler was located in the living room and this new boiler has been installed in the kitchen. The house has 4 radiators upstairs and 4 downstairs. The pipe work seems to be a combination of copper and plastic. A previous owner...