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OK I give up. Where do check valves/double check valves go? They are as cheap as chips so better to fit now rather than rip the wall apart later! D :cry:

Can some kind soul give me (a link to) an intelligible :?: explanation of how UFCH controls etc work and what they comprise of in a multi-zone system? Also, is it possible, wise and economic to assemble a simple but effective set of the controls etc from components. 'Workstation' a Screwfix...

Where do i fit a Comap DBV when using a neutralizer? Neutralizer combines output from oil Camray boiler with Stanley brange cooker? :? many thanks