Worcester Bosch Pipe Expansion Vessel 8716117032

The Worcester Bosch 8716117032 is a pipe expansion vessel that forms part of the internal pipework on Worcester Bosch gas-fired boilers. It sits within the water circuit and accommodates changes in volume as the system heats and cools, helping to keep pressure stable through the appliance. The part is listed against the Greenstar i ErP System family and a further group of Worcester Bosch models.

• Boiler pressure drops repeatedly and the system needs frequent topping up
• Water weeping, damp staining or crusting around the vessel connection
• Visible corrosion, pitting or scale on the pipe surface
• Knocking, gurgling or vibration from the pipework when the boiler fires
• Pressure gauge readings that swing widely across a heating cycle

• Check the GC number and the appliance serial plate to confirm the part matches your model.
• The alternative number 1030993 may appear on some documentation in place of 8716117032.
• Inspect the seals and washers at the connection point and renew them if they are worn or hardened.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.