Worcester Greenstar 25Si 30Si Boiler Expansion Vessel Connector 87161064300

Product Overview

The Worcester Bosch Greenstar Expansion Vessel Connector (Part Number: 87161064300) is a replacement hydraulic connection component intended for selected Worcester Bosch heating systems.

The connector forms part of the expansion vessel connection arrangement within the boiler's sealed central heating circuit.

The expansion vessel accommodates changes in heating water volume as the system temperature increases. Its connection to the heating circuit is important for maintaining the intended pressure management arrangement.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished components should be professionally inspected for damage, wear and leakage before installation.

Technical Insight & Common Failure Symptoms

The expansion vessel connector is a hydraulic fitting associated with the boiler's expansion vessel assembly. It provides a connection between the expansion vessel and the relevant part of the heating circuit.

Damage, deterioration or leakage affecting this connection may interfere with the integrity of the sealed heating system.

Possible signs that the expansion vessel connector or associated components require inspection include:

• Water leakage around the expansion vessel connection.

• Visible corrosion or deterioration of the connector.

• Damaged or worn connection surfaces.

• Loose or insecure hydraulic connections.

• Heating system pressure loss associated with leakage.

• Damage identified during boiler servicing.

These symptoms do not necessarily confirm a faulty expansion vessel connector, as pressure loss or leakage may result from other hydraulic components, seals or connections. Correct professional diagnosis should be carried out before replacement.

Compatibility

This part (MPN: 87161064300) is associated with selected Worcester Bosch Greenstar 25Si and 30Si boiler systems.

Please verify the exact boiler model, GC number, connector design, part number and connection specifications against the manufacturer's technical documentation before ordering to ensure correct fitment.

Safety Advice

Boiler expansion vessel connectors and associated pressurised hydraulic components should only be inspected, removed or installed by a suitably qualified and competent heating engineer.

Always isolate the appliance and allow the heating system to cool before carrying out any work. The relevant heating circuit must be safely isolated and depressurised before removing the connector. Follow the manufacturer's servicing instructions and complete all required pressure, leakage and operational safety checks before returning the boiler to service.