Worcester Bosch Plate Heat Exchanger 14 Plate 87161066850

The Worcester Bosch 14 plate heat exchanger (87161066850) is a brazed plate pack that transfers heat from the boiler's primary circuit into the domestic hot water supply. It is fitted across the Greenstar CDi combi range, where it forms the main DHW heat transfer component. The unit is a serviceable spare, replaced when the plate channels become scaled, blocked or perforated.

• Domestic hot water runs hot then cold, or the tap temperature fluctuates during draw-off
• Hot water output falls away while the central heating continues to run normally
• The boiler locks out or shows a fault code when a hot tap is opened
• Scale or system debris restricting flow through the plate channels, most common in hard water areas
• Water weeping from the plate pack or from the connections around it

• Check the GC number and data badge on the appliance to confirm the correct variant before ordering
• Match the part number on the failed unit against 87161066850, and cross-check the alternative numbers listed
• Seals or gaskets at the plate connections may need renewing at the same time as the exchanger
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.