Worcester Bosch Heat Exchanger WB6 Assembled 8716117040

The Worcester Bosch WB6 heat exchanger assembly (part 8716117040) is the main heat transfer component used across the Greenstar i ErP system boiler range. It takes heat from the combustion gases and passes it into the system water that serves the radiators and the domestic hot water circuit. Supplied as a complete assembled unit, it is intended as a direct replacement for the original component when the existing exchanger has failed or become contaminated.

• Heating or hot water output drops and cannot be traced to the pump, diverter valve or controls
• Kettling, banging or gurgling noises from the boiler while it is firing
• Repeated lockouts or overheat trips as heat transfer falls away
• Visible scale, corrosion or staining around the exchanger body or its connections
• Combustion readings that drift outside the manufacturer's stated tolerance

• Check the appliance model and GC number against the compatibility list before ordering, as the same boiler name can appear with different gas types.
• Confirm the number on the existing component matches 8716117040 or one of the alternative numbers listed below.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.