Worcester Bosch Heat Exchanger 25/32 Greenstar 87161131990

The Worcester Bosch 87161131990 is a heat exchanger manufactured for the Greenstar Heatslave 25/32 appliance family. It sits in the combustion path and transfers heat from the burner into the water circuit that serves the central heating and domestic hot water. Over time the internal waterways and fins can scale, corrode or weep, which is when the unit needs replacing.

• Water weeping or staining around the heat exchanger body or its connections
• Kettling, banging or rumbling noises from the appliance during heat-up
• Reduced hot water output or slower recovery on the domestic hot water side
• Visible corrosion, scale build-up or distortion on the exchanger surfaces
• Repeated overheating or lockout faults traced to poor heat transfer

• Check the appliance model and serial plate against the compatibility list to confirm the 25/32 variant.
• Confirm the part number on the existing component matches 87161131990 or the alternative number 2243947.
• Inspect the seals and gaskets on the exchanger connections and renew them if they are compressed or perished.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.