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I will start a heating upgrade on Monday removing a old glowworm boiler and upgrading the system from a y plan to a s plan , new pump , twin channel programmer , room stat , auto bypass , new Trv's and lockshields, am I right in thinking I will need a pump overrun facility for this boiler all controls are in the airing cupboard, boiler is wall mounted in the kitchen , may need extra wiring is my thought ? . Regards kop