Worcester Bosch
Worcester Bosch Adapter (Flow Limiter) 8737604402
Flow limiter adapter for Worcester Bosch Greenstar 1000 and 2000 series boilers, part number 8737604402.
At a glance
- Also known as 1038401
£26.70
£22.25 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 Worcester Bosch 8737604402 is an adapter with a flow limiter function, used in Greenstar 1000 and 2000 series appliances. It sits within the boiler's water circuit and controls the rate at which water passes through that section. The component is identified by the manufacturer part number 8737604402.
Signs this part needs replacing
- Reduced or inconsistent water flow at hot water outlets
- Flow rate that no longer matches the boiler's setting
- Scale or debris build-up restricting the limiter
- Water weeping or dripping from the adapter connection
Before you order
- Confirm your boiler model against the fit list above.
- Check the part number on the existing component matches 8737604402.
- Isolate the water supply and depressurise the appliance before removal.
- Inspect the surrounding pipework for scale or debris.
Compliance
| Alternative numbers | 1038401 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 1000 SERIES GR1000W 24 C NG | 47-800-38 | 47-800-38 | — | — |
| WORCESTER GREENSTAR 1000 SERIES GR1000W 30 C NG | 47-800-39 | 47-800-39 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 25 C LPG | 47-800-35 | 47-800-35 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 25 C NG | 47-800-34 | 47-800-34 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 30 C LPG | 47-800-37 | 47-800-37 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 30 C NG | 47-800-36 | 47-800-36 | — | — |
| WORCESTER GREENSTAR GR1000W 24 C NG | — | — | — | |
| WORCESTER GREENSTAR GR1000W 30 C NG | — | — | — | |
| WORCESTER GREENSTAR GR2301iW 25 C LPG COMBI | — | — | — | |
| WORCESTER GREENSTAR GR2301iW 25 C NG COMBI | — | — | — |
Showing 10 of 12 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.