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Baxi Bermuda 401 and 552 back boiler are they suitable to be used with a sealed ch system ? CH system is currently open vent and thinking of converting to sealed system as problems with CH expansion tank Many thanks

Hi just joined this website and this is my first post so all help gratefully received. I need some advice please, my mum has a bungalow with a back boiler and open vented heating system. The hot water tank is in the loft and above it in the highest part of the roof is the CW tank and stuck...