Worcester Bosch
Worcester Bosch 87161202890 Tank Assembly - Heatslave 20/25
Worcester Bosch 87161202890 tank assembly for Heatslave oil combi appliances, part of the expansion vessel and tank group.
At a glance
- Part type: Tank assembly
- Also known as 1015907
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
£707.41
£589.51 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 87161202890 is a tank assembly supplied for Worcester Bosch oil-fired combi appliances. It sits within the expansion vessel, tank and cylinder group, where it absorbs changes in system volume and pressure as the appliance heats and cools. The assembly is a direct replacement item for the original fitted component and is listed by Worcester Bosch under part number 87161202890.
Signs this part needs replacing
- System pressure drops repeatedly with no visible leak on the pipework or radiators
- Water weeping from the tank body, seams or its connections
- Corrosion, staining or scale visible on the tank surface
- Boiler pressure climbs quickly once the appliance is up to temperature
- Water discharging from the pressure relief valve during normal running
Before you order
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
- Check the appliance model and serial number against the compatibility list below before ordering.
- The alternative number 1015907 may appear on older Worcester Bosch documentation for the same item.
- Confirm the connection arrangement matches your Heatslave variant, as OSO and RSO versions are both listed.
Mechanical
| Part type | Expansion Vessels, Tanks & Cylinders |
|---|---|
| Length | 0.1mm |
| Width | 0.1mm |
| Depth | 0.1mm |
Compliance
| Manufacturer part number (MPN) | 87161202890 |
|---|---|
| Barcode / EAN | 4010009760955 |
| Commodity code | 8403 90 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 1015907 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER HEATSLAVE 12/14-OSO-GB OIL COMBI (JUL 1996) | — | — | — | |
| WORCESTER HEATSLAVE 12/14-OSO-GB OIL COMBI (OCT 2001) | — | — | — | |
| WORCESTER HEATSLAVE 12/14-RSO-GB OIL COMBI (JUN 1997) | — | — | — | |
| WORCESTER HEATSLAVE 12/14-RSO-GB OIL COMBI (OCT 2001) | — | — | — | |
| WORCESTER HEATSLAVE 15/19-OSO-GB OIL COMBI (JUL 1996) | — | — | — | |
| WORCESTER HEATSLAVE 15/19-RSO-GB OIL COMBI (JUN 1997) | — | — | — | |
| WORCESTER HEATSLAVE 20/25-OSO-GB OIL COMBI (JUN 1996) | — | — | — | |
| WORCESTER HEATSLAVE 20/25-OSO-GB OIL COMBI (SEPT 2001) | — | — | — | |
| WORCESTER HEATSLAVE 20/25-RSO-GB OIL COMBI (JUN 1997) | — | — | — | |
| WORCESTER HEATSLAVE 20/25-RSO-GB OIL COMBI (SEPT 2001) | — | — | — |
Showing 10 of 20 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 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.