This Worcester expansion vessel plays a key role in controlling pressure inside your heating system. The refurbished expansion vessel with part number 8716117023 prevents excess pressure buildup, helping your boiler run smoothly and safely. It’s designed to absorb pressure changes caused by heated water expansion.

Compatible Boilers

To ensure a proper fit, this part is compatible with the following Worcester Bosch models:

Greenstar i Combi ERP Series:

• Greenstar 25i Combi ERP – GC No. 47-406-60 (7733600012)

• Greenstar 25i Combi ERP LPG – GC No. 47-406-61 (7733600031)

• Greenstar 30i Combi ERP – GC No. 47-406-62 (7733600005)

• Greenstar 30i Combi ERP LPG – GC No. 47-406-63 (7733600032)

Greenstar i System ERP Series:

• Greenstar 9i System ERP – GC No. 41-406-21 (7733600011)

• Greenstar 9i System ERP LPG – GC No. 41-406-22 (7733600033)

• Greenstar 12i System ERP – GC No. 41-406-23 (7733600010)

• Greenstar 12i System ERP LPG – GC No. 41-406-24 (7733600034)

• Greenstar 15i System ERP – GC No. 41-406-25 (7733600009)

• Greenstar 15i System ERP LPG – GC No. 41-406-26 (7733600035)

• Greenstar 18i System ERP – GC No. 41-406-27 (7733600008)

• Greenstar 18i System ERP LPG – GC No. 41-406-28 (7733600036)

• Greenstar 21i System ERP – GC No. 41-406-29 (7733600007)

• Greenstar 21i System ERP LPG – GC No. 41-406-30 (7733600037)

• Greenstar 24i System ERP – GC No. 41-406-31 (7733600006)

• Greenstar 24i System ERP LPG – GC No. 41-406-32 (7733600038)

Why Choose This Product?

The 8716117023-expansion vessel keeps your boiler’s pressure balanced, reducing the risk of leaks or faults. Each refurbished unit is carefully tested for durability and reliability. This offers you a cost-saving, eco-friendly alternative to new parts without sacrificing performance. It’s ideal for routine maintenance or pressure-related repairs.

Delivery and Return 

Orders placed before 2 PM ship the same day with tracked delivery. Choose between standard or next-day options at checkout. We accept returns within 14 days for unused parts in original packaging.

Important: Always use a Gas Safe registered engineer to install boiler components safely and legally.