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Ta for the suggestions. The old 'hosepipe down the header tank feed' trick has sorted it out! Thanx, Andy

Hi, My CH radiators dont warm up... I have a Boulter Boiler which has two flow and two return pipes. One flow/return is used to heat the HW cylinder and a bathroom radiator. The other flow/return is for the CH. The HW and CH pipework is completely separate outside of the boiler. I...