Worcester Bosch
Worcester Bosch Condensate Sump Assembly 87186813620
Condensate sump assembly for Worcester Bosch Greenstar boilers, part 87186813620, GC H71-762; fits 44 models.
At a glance
- Part type: Condensate sump assembly
- Also known as 1022640
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Showing prices
£24.53
£20.44 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 87186813620 is a condensate sump assembly used in Greenstar gas boilers. It sits in the condensate path, collecting the acidic water produced during combustion and feeding it towards the condensate trap and drain. A sound sump keeps condensate moving out of the appliance and away from internal components.
Signs this part needs replacing
- Water or condensate collecting inside the boiler casing or pooling beneath the appliance
- Dripping from the sump area while the boiler is running
- Boiler locking out or displaying a condensate-related fault
- Visible cracks, distortion or heavy scale build-up on the sump body
- Gurgling, slow drainage or a blocked condensate trap that keeps recurring
Before you order
- Check the GC number and the appliance serial plate to confirm the sump matches your model.
- Cross-check the alternative numbers 1022640 and WB87186813620 against the part being removed.
- Inspect the sump seal and trap connections; a replacement gasket or seal may be needed to complete the repair.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Condensate Traps & Siphons |
|---|---|
| Length | 0.1mm |
| Width | 0.1mm |
| Depth | 0.1mm |
Compliance
| Manufacturer part number (MPN) | 87186813620 |
|---|---|
| GC number | H71-762 |
| Barcode / EAN | 4047416742199 |
| Commodity code | 8403 90 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | WB87186813620, 1022640 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 12Ri ErP LPG | 41-406-42 | 41-406-42 | — | — |
| WORCESTER GREENSTAR 12Ri ErP NG | 41-406-41 | 41-406-41 | — | — |
| WORCESTER GREENSTAR 12Ri ErP+ LPG | 41-406-69 | 41-406-69 | — | — |
| WORCESTER GREENSTAR 12Ri ErP+ NG | 41-406-75 | 41-406-75 | — | — |
| 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 15Ri ErP LPG | 41-406-44 | 41-406-44 | — | — |
| WORCESTER GREENSTAR 15Ri ErP NG | 41-406-43 | 41-406-43 | — | — |
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 — GREENSTAR 12Ri ErP LPG (GC 41-406-42), GREENSTAR 12Ri ErP NG (GC 41-406-41), GREENSTAR 15Ri ErP LPG (GC 41-406-44), GREENSTAR 15Ri ErP NG (GC 41-406-43), GREENSTAR 18Ri ErP LPG (GC 41-406-46), GREENSTAR 18Ri ErP NG (GC 41-406-45), GREENSTAR 24Ri ErP LPG (GC 41-406-48), GREENSTAR 24Ri ErP NG (GC 41-406-47)
manualmanualWORCESTER appliance manual — GREENSTAR 12Ri ErP+ LPG (GC 41-406-69), GREENSTAR 12Ri ErP+ NG (GC 41-406-75), GREENSTAR 15Ri ErP+ LPG (GC 41-406-70), GREENSTAR 15Ri ErP+ NG (GC 41-406-76), GREENSTAR 18Ri ErP+ LPG (GC 41-406-71), GREENSTAR 18Ri ErP+ NG (GC 41-406-77), GREENSTAR 21Ri ErP+ LPG (GC 41-406-72), GREENSTAR 21Ri ErP+ NG (GC 41-406-78), GREENSTAR 24Ri ErP+ LPG (GC 41-406-73), GREENSTAR 24Ri ErP+ NG (GC 41-406-79), GREENSTAR 9Ri ErP+ LPG (GC 41-406-68), GREENSTAR 9Ri ErP+ NG (GC 41-406-74)
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)
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