Worcester Bosch
Worcester Bosch Nozzle 4.5 LPG 873791545A0
LPG injector nozzle rated 4.5 for Worcester Bosch Greenstar Compact boilers, part 873791545A0 (GC J04-394).
At a glance
- Part type: Injector nozzle
- Also known as 1031051
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
£6.74
£5.62 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 4.5-rated LPG injector nozzle manufactured by Worcester Bosch for its Greenstar Compact range of gas boilers. The nozzle meters the flow of liquefied petroleum gas into the burner, so the size stamped on it directly sets the gas input rate and the air/gas mixture at the burner head. It is a small but critical combustion component, and the correct rating must match the appliance and fuel type exactly.
Signs this part needs replacing
- Sooting or blackening around the burner head or heat exchanger
- Unstable flame, flame lift or a burner that will not hold a steady light
- Combustion readings drifting outside the expected CO/CO2 range for the appliance
- Gas rate at the meter that no longer matches the data badge figure
- Rough or delayed ignition traced to the burner assembly
Before you order
- Check the GC number and appliance serial plate to confirm the boiler model and fuel type before ordering.
- Confirm the nozzle rating matches the data badge for the appliance; LPG and natural gas versions are not interchangeable.
- Inspect the burner seal or gasket while the burner is apart and replace it if it shows signs of hardening or damage.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Injector nozzle |
|---|
Compliance
| Manufacturer part number (MPN) | 873791545A0 |
|---|---|
| GC number | J04-394 |
| Barcode / EAN | 4051516762025 |
| Commodity code | 8416 90 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 1031051 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 25SI COMPACT LPG | 47-406-51 | 47-406-51 | — | — |
| WORCESTER GREENSTAR 25Si ErP COMPACT LPG | 47-407-74 | 47-407-74 | — | — |
| WORCESTER GREENSTAR 27I COMPACT SYSTEM LPG | 41-406-14 | 41-406-14 | — | — |
| WORCESTER GREENSTAR 27Ri ErP COMPACT LPG | 41-406-55 | 41-406-55 | — | — |
| WORCESTER GREENSTAR 27i ErP SYSTEM COMPACT LPG | 41-406-59 | 41-406-59 | — | — |
| WORCESTER GREENSTAR 28 CDI COMPACT LPG | 47-406-45 | 47-406-45 | — | — |
| WORCESTER GREENSTAR 28CDi ErP COMPACT LPG | 47-406-78 | 47-406-78 | — | — |
| WORCESTER GREENSTAR 30 SI COMPACT LPG | 47-406-53 | 47-406-53 | — | — |
| WORCESTER GREENSTAR 30I COMPACT SYSTEM LPG | 41-406-16 | 41-406-16 | — | — |
| WORCESTER GREENSTAR 30Ri ErP COMPACT LPG | 41-406-57 | 41-406-57 | — | — |
Showing 10 of 31 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.
WORCESTER appliance manual — GREENSTAR 25SI COMPACT LPG (GC 47-406-51), GREENSTAR 30 SI COMPACT LPG (GC 47-406-53)
manualmanualWORCESTER appliance manual — GREENSTAR 25Si ErP COMPACT LPG (GC 47-407-74), GREENSTAR 30Si ErP COMPACT LPG (GC 47-406-76)
manualmanualWORCESTER appliance manual — GREENSTAR 27I COMPACT SYSTEM LPG (GC 41-406-14), GREENSTAR 30I COMPACT SYSTEM LPG (GC 41-406-16)
manualmanualWORCESTER appliance manual — GREENSTAR 27Ri ErP COMPACT LPG (GC 41-406-55), GREENSTAR 30Ri ErP COMPACT LPG (GC 41-406-57)
manualmanualWORCESTER appliance manual — GREENSTAR 27i ErP SYSTEM COMPACT LPG (GC 41-406-59), GREENSTAR 30i ErP SYSTEM COMPACT LPG (GC 41-406-61)
manualmanualWORCESTER appliance manual — GREENSTAR 28 CDI COMPACT LPG (GC 47-406-45)
manualmanualWORCESTER appliance manual — GREENSTAR 28CDi ErP COMPACT LPG (GC 47-406-78), GREENSTAR 32CDi ErP COMPACT LPG (GC 47-406-80), GREENSTAR 36CDi ErP COMPACT LPG (GC 47-406-82)
manualmanualWORCESTER appliance manual — GREENSTAR 32CDI COMPACT LPG (GC 47-406-47), GREENSTAR 36CDI COMPACT LPG (GC 47-406-49)
manualmanualWORCESTER appliance manual — GREENSTAR RI 27KW COMPACT LPG (GC 41-406-18), GREENSTAR Ri 30KW COMPACT LPG (GC 41-406-20)
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