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plumbingservices
It`s not a combi mate, circulation has nothing to do with f and e tank,tank is there to top up only,it`s rarely used,a blocked cold feed doesn`t matter at all. Everything still works. Think about it. If tee is blocked through to coil you won`t know unless you have probs with heating. Blocked cold feed won`t interrupt circulation it just won`t be there when youneed to top up heating system/ rads/coil will it?