Worcester Bosch
Worcester Bosch Greenstar ErP 21i System mixing unit 8716117258
Air/gas mixing unit for the Worcester Bosch Greenstar ErP 21i System boiler (gas code 41-406-29), part number 8716117258.
At a glance
- Also known as 1031279
- Gas Safe registered engineer only
£12.60
£10.50 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 8716117258 is an air/gas mixing unit for the Worcester Bosch Greenstar ErP 21i System combi boiler, gas code 41-406-29. It blends incoming gas and combustion air in the correct ratio before the mixture reaches the burner.
Signs this part needs replacing
- Boiler locks out on an ignition or combustion fault
- Uneven, noisy or surging burner operation
- Boiler fails to modulate output correctly
Before you order
- Match the part number stamped on the unit you're removing
- Isolate the gas supply and electrical power before removal
- Gas Safe registered engineer only
Compliance
| GC number | J25-319 |
|---|---|
| Barcode / EAN | 4054925560909 |
| Alternative numbers | 1031279 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 15i ErP SYSTEM LPG | 41-406-26 | 41-406-26 | — | — |
| WORCESTER GREENSTAR 15i ErP SYSTEM NG | 41-406-25 | 41-406-25 | — | — |
| WORCESTER GREENSTAR 18i ErP SYSTEM LPG | 41-406-28 | 41-406-28 | — | — |
| WORCESTER GREENSTAR 18i ErP SYSTEM NG | 41-406-27 | 41-406-27 | — | — |
| WORCESTER WORCESTER GREENSTAR 15i ErP SYSTEM LPG | — | — | — | |
| WORCESTER WORCESTER GREENSTAR 15i ErP SYSTEM NG | — | — | — | |
| WORCESTER WORCESTER GREENSTAR 18i ErP SYSTEM LPG | — | — | — | |
| WORCESTER WORCESTER GREENSTAR 18i ErP SYSTEM NG | — | — | — |
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.
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