Worcester Bosch Plate Heat Exchanger 12 Plate 87161066860

The Worcester Bosch 87161066860 is a 12 plate heat exchanger built for the Greenstar family of domestic gas boilers. It sits in the appliance's water circuit and transfers heat between the primary and domestic hot water sides, which is what allows the boiler to deliver hot water on demand. As a serviceable component it is replaced when performance drops or the plate stack becomes blocked or scaled.

• Domestic hot water runs hot then cold, or the temperature swings noticeably at the tap
• Reduced hot water flow rate compared with the boiler's normal output
• Boiler locks out or trips on an overheat fault during a hot water draw
• Scale or debris visible in the plate stack, or a drop in heat transfer across the exchanger
• Weeping or staining around the plate pack or its connections

• Check the GC number and appliance serial plate against the compatibility list to confirm the correct exchanger for your model
• Cross-check the alternative numbers 1015033, N1009 and WB87161066860 against the part you are removing
• Have the correct sealing washers or gasket kit to hand before starting the swap
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.