Vokera DHW Heat Exchanger 20223999

The Vokera 20223999 is a domestic hot water (DHW) heat exchanger used in Vokera combi boilers. It transfers heat from the primary circuit to the domestic hot water supply, so it sits at the centre of the boiler's hot water performance. It is a plate-type DHW heat exchanger supplied as a single component.

• Domestic hot water runs hot then cold, or the temperature fluctuates at the tap
• Reduced hot water flow rate compared with the cold supply
• Scale or debris blocking the DHW circuit, often after work on the mains supply
• Water weeping from the plate pack or from the connections
• Banging or kettling noise when the boiler runs in hot water mode

• Confirm your boiler model and gas variant against the fit list above — LPG and NG versions of the same model are listed separately
• Check the part number on the existing heat exchanger matches 20223999
• Inspect the connections and seals on the existing unit, as scale and corrosion often affect the surrounding parts as well
• If the boiler has a history of hard water scale, check whether the primary side also needs attention before fitting