how many pipes, both hot and cold, should there be in my airing cupboard?!! I have the vent and hot water draw off's from the top of my hot water cylinder (inclduing the 450mm min offset), I have a sepearte hot and cold feed pipe to my shower (which is a manual mixer over my bath), I have a grundfos pump (for central heating i believe)?? and a motorized valve, (3-port valve i believe)?? and a primary flow and return pipe coming up from my boiler which is directly downstairs below in the kitchen. I think I have a primary feed and primary vent pipe also passing through my cupboard too! But do the central heating pipes run through my cupboard too? I'm a bit confused but want to learn??!! Because I can't put a name to ALL the pipes and it's bugging me!!!