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Thanks for that, I was trying to avoid draining the system via the rads, as non of them have a drain point on! Nocomp

Hello I need to change the external expansion vessel connected to Baxi 105HE Combi boiler. Is the procedure Turn off power to bolier Turn off cold water at mains supply Empty hot water via lowest hot water tap until boiler pressure is zero Unscrew old vessel and replace with new one...