Baxi 7225723 Potterton Heat Exchanger DHW 16 Plates

The Baxi 7225723 is a domestic hot water (DHW) plate heat exchanger with 16 plates, manufactured by Baxi. It sits in the DHW circuit of the appliance, where heat from the primary water is transferred across the plate stack to the incoming cold mains supply to produce hot water at the tap. It is used across the Baxi Eco Elite, Performa and HE appliance families.

• Hot water runs cold or only lukewarm while the heating circuit works normally
• DHW temperature fluctuates or drops away as the tap is run
• Reduced hot water flow rate at the outlets despite adequate mains pressure
• Water weeping or staining around the plate stack or its connections
• Scale or sludge build-up restricting flow through the plates, often on hard water areas

• Confirm the appliance model and, where available, the GC number before ordering, as plate count and connection layout differ between variants.
• Check the part number on the existing component against 7225723 to confirm a like-for-like replacement.
• Inspect the seals and connections on removal and replace any gaskets or O-rings that are disturbed during the swap.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.