Why not get Worcester Bosch to come and have a look.they want good feedback from these products as they are really trying to push them at the moment. . to be honest I have no experience with them and the system is prone to installer error, so would really need a site visit to diagnose. Will opt out anyway to see if there is anyone on here with proper experience of them.just wanted to suggest what I would do , go straight to Worcester Bosch customer services and demand a site visit
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