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Hi "doitall", thank you for your reply. No there are no air vents on or around the cylinder. Regards, Mark :)

Hi everyone, I hope someone can help. The story goes like this!! I drained the central heating system in order to fit new radiator valves. Refilled and bled the radiators and everything seemed fine, until I realised there was no hot water. Cold water from the hot taps and the cylinder was...