Worcester Bosch
Worcester Bosch Manifold Expansion Vessel 87186489730
Expansion vessel manifold for Worcester Bosch Greenstar 4000 System Gr4700IW boilers.
At a glance
- Appliance family: Greenstar 4000 System Gr4700IW
- Also known as 2248848
£4.20
£3.50 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The MANIFOLD (EXPANSION VESSEL) is a Worcester Bosch component that connects the expansion vessel to the heating circuit in Greenstar 4000 System Gr4700IW boilers. It carries system water to and from the vessel and provides the mounting and connection point for the vessel on the appliance. The part is supplied under Worcester Bosch part number 87186489730.
Signs this part needs replacing
- Water weeping or staining around the manifold connections
- Repeated loss of system pressure requiring regular topping up
- Corrosion, scale or debris blocking the manifold ports
- Leaks at the joint between the manifold and the expansion vessel
Before you order
- Confirm the boiler model and GC number against the fit list
- Check the part number on the existing manifold matches 87186489730
- Inspect the expansion vessel itself to establish whether it also needs replacing
- Verify the appliance is a Greenstar 4000 System Gr4700IW rather than another Greenstar variant
Compliance
| Alternative numbers | 2248848 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 12 S LPG | 41-800-08 | 41-800-08 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 12 S NG | 41-800-07 | 41-800-07 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 15 S LPG | 41-800-10 | 41-800-10 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 15 S NG | 41-800-09 | 41-800-09 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 18 S LPG | 41-800-12 | 41-800-12 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 18 S NG | 41-800-11 | 41-800-11 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 21 S LPG | 41-800-14 | 41-800-14 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 21 S NG | 41-800-13 | 41-800-13 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 24 S LPG | 41-800-16 | 41-800-16 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 24 S NG | 41-800-15 | 41-800-15 | — | — |
Showing 10 of 20 compatible appliances.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.