Worcester Bosch Heat Exchanger 24Si II 87154065460

The Worcester Bosch 87154065460 is a heat exchanger for a Worcester gas boiler. It sits in the combustion path and transfers heat from the burner gases into the appliance water circuit, which is the component that turns burner output into usable hot water and heating.

This unit is listed against the Worcester 24Si II RSF natural gas appliance family. It is a serviceable component, so it is normally replaced when the existing exchanger has failed or is no longer performing within specification.

• The boiler runs but the water or heating circuit stays cold, or the appliance cannot hold its set temperature.
• Water weeping from the exchanger body, its seals or its pipe connections.
• Repeated overheating trips, lockouts or temperature-related fault codes during a demand for heat.
• Kettling, banging or rumbling noises from the exchanger as it heats up.
• Combustion readings drifting outside tolerance, or sooty or discoloured deposits around the exchanger.

• Confirm the appliance model and serial number against the compatibility list before ordering.
• Check the part number on the original component matches 87154065460, and note the alternative number 1029999.
• Inspect the seals and connections on the existing exchanger while access is available, as these are disturbed during replacement.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.