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Is it a header tank or an expansion tank?

I have a Gledhill Boilermate 11 and on top of this hot water cylinder is a smaller tank with a cold water feed and ball valve is this tank purely for the central heating system ?
neil morgan, April 2008
Yes it is purely for the central heating system...

Do you have a problem with it? or just curious?

T, April 2008
I answered this already for you a few posts ago?
What didn't you understand?

T, April 2008