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Thanks for the replies. Managed to drain the CH system by draining from on of the rad valves. Didn't take too long. Cheers.

Hi all, looking to replace a radiator in the bathroom. Central Heating system is open vented. The problem is I can't find a drain valve for the CH system and none of the radiators appear to have a drain/tap outlet either. Can I drain the system by closing one of the rad valves in the bathroom...