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here is a basic drawing of the actual system, would it be better to just add the pump on the 15mm feeding the rads? Ideally in the cupboard upstairs.

Ok folks, this takes some explaining but please bear with me... In short my existing CH system is an open vented system with an oil fed boiler (HW & CH) and also an AGA with back boiler that provides the hot water when on in winter. There are two separate coils in the hot water cylinder, on...