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City Plumbing GB£133.20Visit shop Worcester Bosch Heatslave 12 Litre Expansion Vessel 87161076600
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The Worcester Bosch 12-litre expansion vessel (part number 87161076600) is an essential maintenance component for homeowners and heating engineers managing Greenstar oil and Greenstar ErP boiler systems. Its primary function is to safely absorb thermal expansion of the water in your heating circuit, preventing dangerous pressure spikes and system leaks. Please note that while the unit comes pre-charged, it is a pressurized component that requires careful handling and professional installation to ensure system integrity.
| Model Part Number | 87161076600 |
|---|---|
| Brand | Worcester Bosch |
While it is a physical component, installation involves opening the sealed heating system. We strongly recommend a qualified heating engineer perform the installation.
It should be inspected during every annual boiler service to ensure the air pressure remains correct.
If the diaphragm fails, the vessel fills with water and can no longer absorb expansion, causing the pressure relief valve to discharge water.
No, it is specific to the Greenstar oil and Greenstar ErP boiler ranges. Always check your specific appliance manual.
Yes, it is delivered pre-charged, though final adjustments may be needed by the installer based on your system's specific requirements.
The expansion vessel may have lost its air charge or the diaphragm may be split; check the pre-charge pressure.
The system pressure is too high, often due to an under-pressurized or failed expansion vessel.
To install this unit, the primary boiler system must be fully isolated and drained to avoid flooding. It is highly recommended that this be completed by a qualified heating professional.
Compatibility: This vessel is compatible with the Worcester Bosch Greenstar oil and Greenstar ErP product lines. Always check your specific boiler manual to ensure the 12-litre capacity is sufficient for your total system volume.
Care: Over time, the internal air pressure can bleed off. During annual boiler servicing, your technician should check the vessel's air pressure (usually using a standard tire pressure gauge) and top it up via the Schrader valve if necessary. If you see signs of water leaking from the air valve, the internal diaphragm has likely failed, and the vessel must be replaced immediately.
