Worcester Bosch Secondary Heat Exchanger Assembly 25 Fin 87161076730

The Worcester Bosch 87161076730 is a secondary heat exchanger supplied as a final assembly with a 25-fin core. It sits in the condensing path of the appliance, where it recovers residual heat from the flue gases and passes it into the cooler return water before the gases are discharged.

This is the final assembly variant, so the exchanger is supplied complete as a single unit rather than as a bare core. It belongs to the Worcester Bosch Greenstar Utility and Danesmoor HE appliance family.

• Falling condensing efficiency, with noticeably higher flue gas temperatures than normal
• Water weeping from the exchanger body, its joints or the surrounding seals
• Kettling, gurgling or rumbling noises during the heating cycle
• The appliance cycling, locking out or struggling to reach its set flow temperature
• Visible corrosion, scale build-up or debris bridging the fins when the casing is opened

• Check the model and GC number on the appliance data badge against the compatibility list below before ordering.
• Confirm the number on the original part matches 87161076730 or the alternative number 1015243.
• Inspect the seals and gaskets on removal and renew any 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.