Worcester Bosch
Worcester Bosch Venturi D=2.9mm 87186509450
Worcester Bosch venturi with a 2.9 mm bore, fitted to Greenstar 4000 System GR4700IW boilers.
At a glance
- Appliance family: Greenstar 4000 System GR4700IW
- Also known as 2249861
£11.45
£9.54 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
This is a Worcester Bosch venturi, supplied under part number 87186509450 and marked with a bore of D=2.9 mm. It sits within the gas and air circuit of the appliance, where the narrowed bore creates the pressure differential that the boiler uses to regulate combustion. It is used on Greenstar 4000 System GR4700IW models.
Signs this part needs replacing
- Combustion readings that will not settle within the appliance's stated tolerances
- Unstable or fluctuating flame picture at the burner
- Repeated lockouts or ignition faults traced to the gas and air circuit
- Visible blockage, debris or damage at the venturi bore
- Whistling or abnormal noise from the air and gas intake
Before you order
- Confirm the part number on the existing venturi matches 87186509450
- Check the bore marking on the component against D=2.9 mm
- Identify the exact appliance model and fuel type (NG or LPG) from the data badge
- Verify the appliance is a Greenstar 4000 System GR4700IW variant
Compliance
| Alternative numbers | 2249861 |
|---|
| 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 GR4700iW 12 S LPG SYSTEM | 41-800-08 | 41-800-08 | — | — |
| WORCESTER GREENSTAR GR4700iW 12 S NG SYSTEM | 41-800-07 | 41-800-07 | — | — |
| WORCESTER GREENSTAR GR4700iW 15 S LPG SYSTEM | 41-800-10 | 41-800-10 | — | — |
| WORCESTER GREENSTAR GR4700iW 15 S NG SYSTEM | 41-800-09 | 41-800-09 | — | — |
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.