Worcester Boiler Greenstar 30CDi Combi Expansion Vessel 7L

This worcester greenstar combi expansion vessel 7l absorbs pressure changes within the heating system as water heats and expands. A failed vessel can cause pressure loss, frequent topping up, safety valve discharge, or boiler lockouts. Over time the internal diaphragm weakens, leading to unstable system pressure. Replacing it with the correct 7L vessel restores stable pressure control, protects internal components, and reduces the risk of breakdown or system shutdown.

Compatibility :

• Greenstar CDI System: 30
• Greenstar CDI Combi: 25, 30, 35, 40
• Greenstar CDI HE Combi: 27, 30, 37, 42
• Greenstar CDI HE Combi LPG: 27, 30, 37, 42
• Greenstar CDI Classic: 29, 34, 38
• Greenstar CDI Classic LPG: 29, 34, 38
• Greenstar CDI Classic ErP: 29, 34, 38, 42
• Greenstar CDI Classic ErP LPG: 29, 34, 38, 42
• Greenstar CDI Classic System ErP: 30, 35
• Greenstar CDI Classic System ErP LPG: 30, 35
• Camray System: 12/18, 18/25, 25/32
• Camray Utility System: 12/18, 18/25, 25/32
• Danesmoor System: 12/18, 18/25, 25/32
• Danesmoor System ErP: 12/18, 18/25, 25/32
• Danesmoor External ErP: 12/18, 18/25, 25/32
• Danesmoor Utility System: 12/18, 18/25, 25/32
• Danesmoor Utility System ErP: 12/18, 18/25, 25/32

Important fitting advice

We recommend that all parts are fitted by a fully qualified Gas Safe registered engineer. If you need help confirming the right part, contact us our team has 10+ years of boiler spares knowledge and friendly chat support to help you quickly.

Delivery

At Boiler Spares Hub, we dispatch orders within 1 working day (Monday-Friday). Orders placed outside working days will be dispatched on the next working day. For delivery options available for this product, please add it to your basket or check our delivery options page.

Returns

We accept 30-day returns. Returns must be in an unopened, sealed box. If we find the item has been used or installation was attempted, we may refuse the return.

Frequently Asked Questions (FAQ’s)

1. Is this expansion vessel compatible with Worcester Greenstar 30CDi Combi?
Yes, this 7L expansion vessel fits Worcester Greenstar 30CDi Combi and other selected Greenstar CDI, Classic and ErP models. Always check your appliance model and part number before ordering.

2. Does this replace part number 87154072960?
Yes. Part number 87154072960 has been updated by the manufacturer and is now replaced by 8716122434.

3. What does the expansion vessel do?
It absorbs the increase in water pressure as the system heats up, helping maintain stable boiler pressure and protecting internal components.

4. What are the signs of a failed expansion vessel?
Common signs include pressure rising above 3 bar, pressure dropping when cold, frequent topping up, water discharging from the safety valve, or boiler lockouts.

5. What size is this expansion vessel?
This is a 7 litre (7L) expansion vessel designed for compatible Worcester Greenstar models.