Worcester Bosch
Worcester Bosch Tank Assembly 87186804690
Expansion vessel tank assembly for Worcester Bosch Greenstar Highflow 440CDI and 550CDI boilers.
At a glance
- Appliance family: Greenstar Highflow 440CDI and 550CDI
- Also known as 1030483
£1,203.02
£1,002.52 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 tank assembly, part number 87186804690, is an expansion vessel supplied for the Greenstar Highflow 440CDI and 550CDI range of gas boilers. It provides the sealed expansion volume within the heating circuit, absorbing the pressure rise as the system water heats and expands. The assembly is listed across both natural gas and LPG variants of these models, including ErP versions.
Signs this part needs replacing
- System pressure falls repeatedly and the boiler needs frequent topping up
- Water discharging from the pressure relief valve during heat-up
- The pressure gauge climbs sharply when the heating is running
- Corrosion, staining or damp around the vessel body or its connection
- Water present at the vessel charge point when the valve is checked
Before you order
- Confirm the boiler model from the data plate — 440CDI or 550CDI
- Establish whether the appliance is an ErP or non-ErP build
- Check whether the boiler is natural gas or LPG
- Compare the part number against any markings on the vessel currently fitted
Compliance
| GC number | H71-444 |
|---|---|
| Barcode / EAN | 4047416781051 |
| Alternative numbers | 1030483 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR HIGHFLOW 440CDI LPG | 47-406-26 | 47-406-26 | — | — |
| WORCESTER GREENSTAR HIGHFLOW 440CDI NG | 47-406-24 | 47-406-24 | — | — |
| WORCESTER GREENSTAR HIGHFLOW 440CDi ErP LPG (7738100590) | 47-406-86 | 47-406-86 | — | — |
| WORCESTER GREENSTAR HIGHFLOW 440CDi ErP NG (7738100589) | 47-406-85 | 47-406-85 | — | — |
| WORCESTER GREENSTAR HIGHFLOW 550CDI LPG | 47-406-25 | 47-406-25 | — | — |
| WORCESTER GREENSTAR HIGHFLOW 550CDI NG | 47-406-27 | 47-406-27 | — | — |
| WORCESTER GREENSTAR HIGHFLOW 550CDi ErP LPG (7738100592) | 47-406-88 | 47-406-88 | — | — |
| WORCESTER GREENSTAR HIGHFLOW 550CDi ErP NG (7738100591) | 47-406-87 | 47-406-87 | — | — |
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 HIGHFLOW 440CDI LPG (GC 47-406-26), GREENSTAR HIGHFLOW 440CDI NG (GC 47-406-24), GREENSTAR HIGHFLOW 550CDI LPG (GC 47-406-25), GREENSTAR HIGHFLOW 550CDI NG (GC 47-406-27)
manualmanualWORCESTER appliance manual — GREENSTAR HIGHFLOW 440CDi ErP LPG (7738100590) (GC 47-406-86), GREENSTAR HIGHFLOW 440CDi ErP NG (7738100589) (GC 47-406-85), GREENSTAR HIGHFLOW 550CDi ErP LPG (7738100592) (GC 47-406-88), GREENSTAR HIGHFLOW 550CDi ErP NG (7738100591) (GC 47-406-87)
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