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Baxi Plate Heat Exchanger 20 Plates Kit 7223558, there are two kinds of heat exchangers that can be installed, they are the primary heat exchanger and the secondary heat exchanger. The primary is present in almost all boilers and it allows the heat to be transferred from the burner to the water within the system. The secondary heat exchanger only appears on combination boilers and allows the heat to be transferred between one closed system to another. Baxi Plate Heat Exchanger 20 Plates Kit 7223558 is a Baxi Genuine Boiler Parts, and replaces part numbers 248723, 5114708. If you are replacing a faulty heat exchanger, or a leaking Heat Exchanger use a Genuine Boiler Part, and have it fitted by someone competent IE a Gas Safe Registered Installer. Heatingspares247.com is one of the UK's largest independent Boiler Parts & Heating Spares Stockist, We specialise in the supply of Genuine Boiler Spare Parts from all the leading Manufacturers.