Worcester Bosch
Worcester Bosch Expansion Vessel 6 Litre 87161055450
At a glance
- Part type: Expansion vessel
- Also known as 1014641, N8423
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Showing prices
£103.66
£86.38 ex. VAT · VAT at 20%
Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Worcester Bosch 87161055450 is a 6 litre expansion vessel used in Worcester Bosch domestic gas boilers. It sits on the heating circuit and absorbs the volume change of water as the system heats and cools, keeping pressure stable and protecting components from unnecessary strain. This vessel is common to the Junior and Greenstar appliance families.
Signs this part needs replacing
- System pressure falls repeatedly and the filling loop has to be used often
- Boiler pressure climbs sharply once the heating is running
- Water discharging from the pressure relief valve
- Pressure gauge reads high even when the system is cold
- Banging or knocking noises from the boiler as pressure swings
Before you order
- Check the appliance GC number and model against the compatibility list before ordering
- Cross-reference the alternative numbers 1014641, N8423 and WB87161055450 against the vessel currently fitted
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Expansion vessel |
|---|
Compliance
| Manufacturer part number (MPN) | 87161055450 |
|---|---|
| GC number | H05-206 |
| Barcode / EAN | 4010009680352 |
| Commodity code | 8403 90 00 00 |
| Alternative numbers | WB87161055450, 8-716-105-545-0, 1014641, N8423 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER 24i JUNIOR RSF LPG | 47-311-71 | 47-311-71 | — | — |
| WORCESTER 24i JUNIOR RSF NG | 47-311-69 | 47-311-69 | — | — |
| WORCESTER 28i JUNIOR RSF NG (FEB 2003) | 47-311-72 | 47-311-72 | — | — |
| WORCESTER 28i JUNIOR RSF NG (MAY 2003) | 47-311-70 | 47-311-70 | — | — |
| WORCESTER GREENSTAR 12i SYSTEM LPG | 41-311-69 | 41-311-69 | — | — |
| WORCESTER GREENSTAR 12i SYSTEM NG | 41-311-67 | 41-311-67 | — | — |
| WORCESTER GREENSTAR 15I SYSTEM LPG | 41-406-26 | 41-406-26 | — | — |
| WORCESTER GREENSTAR 15I SYSTEM NG | 41-311-84 | 41-311-84 | — | — |
| WORCESTER GREENSTAR 18I SYSTEM LPG | 41-311-87 | 41-311-87 | — | — |
| WORCESTER GREENSTAR 18I SYSTEM NG | 41-311-86 | 41-311-86 | — | — |
Showing 10 of 44 compatible appliances.
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
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.
manual
WORCESTER appliance manual — 24i JUNIOR RSF LPG (GC 47-311-71), 24i JUNIOR RSF NG (GC 47-311-69), 28i JUNIOR RSF NG (FEB 2003) (GC 47-311-72), 28i JUNIOR RSF NG (MAY 2003) (GC 47-311-70)
manualmanualWORCESTER appliance manual — GREENSTAR 12i SYSTEM LPG (GC 41-311-69), GREENSTAR 12i SYSTEM NG (GC 41-311-67), GREENSTAR 15I SYSTEM LPG (GC 41-406-26), GREENSTAR 15I SYSTEM NG (GC 41-311-84), GREENSTAR 18I SYSTEM LPG (GC 41-311-87), GREENSTAR 18I SYSTEM NG (GC 41-311-86), GREENSTAR 24i SYSTEM LPG (GC 41-311-70), GREENSTAR 24i SYSTEM NG (GC 41-311-68)
manualmanualWORCESTER appliance manual — GREENSTAR 24I JUNIOR MK5 LPG (GC 47-406-55), GREENSTAR 24I JUNIOR MK5 NG (GC 47-406-54), GREENSTAR 24I JUNIOR NG (GC 47-311-86), GREENSTAR 24i JUNIOR LPG (GC 47-311-90), GREENSTAR 28I JUNIOR MK5 LPG (GC 47-406-57), GREENSTAR 28I JUNIOR MK5 NG (GC 47-406-56), GREENSTAR 28i JUNIOR LPG (GC 47-311-91), GREENSTAR 28i JUNIOR NG (GC 47-311-87)
manualmanualWORCESTER appliance manual — GREENSTAR 25SI COMBI LPG (GC 47-311-88), GREENSTAR 25SI COMBI NG (GC 47-311-84), GREENSTAR 30 SI COMBI LPG (GC 47-311-89), GREENSTAR 30 SI COMBI NG (GC 47-311-85)
manualNo 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.