Worcester Boiler Safety Pressure Relief Valve

This worcester boiler pressure relief valve releases excess system pressure to protect your Worcester boiler. Over time, the valve seat can wear or debris can stop it sealing properly, so you may notice the external copper discharge pipe dripping, frequent re-pressurising, or low-pressure lockouts. Replacing the correct new-style PRV restores safe pressure control and helps reduce repeat shutdowns.

Compatibility :

• Greenstar CDI System: 30
• Greenstar Combi CDI: 25, 30, 35, 40
• Greenstar Combi CDI HE: 27, 30, 37
• Greenstar Combi CDI HE LPG: 27, 30, 37
• Greenstar CDI Classic: 29, 34, 38
• Greenstar CDI Classic LPG: 29, 34, 38
• Greenstar CDI Classic ErP: 29
• Greenstar CDI Classic ErP LPG: 29
• Greenstar CDI Classic System ErP: 30, 35
• Greenstar CDI Classic System ErP LPG: 30, 35
• Greenstar CDI Classic ErP: 34, 38, 42
• Greenstar CDI Classic ErP LPG: 34, 38, 42
• Greenstar Combi 42 CDI HE (Classic): 42
• Greenstar Combi 42 CDI HE (Classic) LPG: 42
• Greenstar i Combi ErP: 25i, 30i
• Greenstar i Combi ErP LPG: 25i, 30i
• Greenstar i System: 9, 12, 15, 18, 24
• Greenstar i System LPG: 12, 15, 18, 24
• Greenstar i System ErP: 9, 12, 15, 18, 21, 24
• Greenstar i System ErP LPG: 9, 12, 15, 18, 21, 24
• Greenstar i Junior HE: 24, 28
• Greenstar i Junior HE LPG: 24, 28
• Greenstar i Junior HE Mk5 (2013): 24, 28
• Greenstar Si: 25 Si, 30 Si
• Greenstar Si LPG: 25 Si, 30 Si

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 (FAQs)

1. What does this pressure relief valve (PRV) do?
It releases excess boiler/system pressure safely to protect the boiler and pipework from damage.

2. What are the common signs the PRV needs replacing?
You may see water dripping from the outside discharge pipe, frequent pressure loss, repeated re-pressurising, or low-pressure lockouts.

3. Is this the new-style PRV or the old brass version?
This is the new style PRV (no longer brass), as per the part notes.

4. Which Worcester boilers is this PRV compatible with?
It fits selected Greenstar ranges, including many CDI / CDI Classic / i / Si / Junior models.

5. How do I confirm this is the correct part for my boiler?
Check the boiler model on the data badge and confirm the part number 87161064310 (or the GC part no. H09-750) matches your parts list/diagram.