How to replace a BAXI Combi boiler plate Heat Exchanger. BAXI Main Eco 30. The symptoms were the pressure keeps filling in the heating system and then spitting water out on overflow copper pipe which means the pressure relief valve. The part used is a BAXI original part which was the 16 plate heat exchanger. This is on a pressurised system. #Baxi #heatexchanger #plateheatexchanger

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