Baxi Plate Heat Exchanger Avanta Plus Combi 720544501

The Baxi 720544501 is a plate heat exchanger used in the Avanta family of gas combination boilers. It transfers heat from the primary circuit into the domestic hot water supply, so the appliance can deliver hot water on demand without a separate cylinder. The part is listed under part type HEAT EXCHANGERS and carries the previous number S62776.

• Domestic hot water runs hot then cold, or the temperature swings while a tap is running.
• Hot water output drops noticeably while the central heating continues to work normally.
• Water weeping from the plate stack or from the joints around the exchanger.
• Scale or debris blocking the waterways, giving poor heat transfer and a reduced flow rate.
• The appliance reaches temperature on heating but struggles to satisfy a hot water draw-off.

• Check the appliance GC number and model against the compatibility table above before ordering.
• Confirm the existing part number on the boiler, including the previous number S62776, so the correct exchanger is supplied.
• Inspect the seals and gaskets on the existing exchanger and replace them if they are compressed or damaged before refitting.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.