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City Plumbing GB£151.20Visit shop Alpha 8L Rectangular Expansion Vessel With Bottom Connection 1.02356
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This guide is for certified Gas Safe engineers responsible for boiler maintenance and repair. The Alpha Expansion Vessel - 8Lt (MPN 1.02356) is crucial for protecting closed heating systems from dangerous pressure increases by absorbing excess water volume. While it effectively manages pressure fluctuations, it requires professional installation by a certified engineer.
| Model Part Number | 1.02356 |
|---|---|
| Brand | Alpha |
This expansion vessel must be installed by a certified Gas Safe engineer. Attempting to install it yourself can be dangerous and may void your boiler's warranty.
Its main function is to absorb the increased volume of water that occurs when the heating system heats up, thereby preventing excessive pressure build-up.
While generally maintenance-free, a Gas Safe engineer should check the vessel's pre-charge pressure during annual boiler servicing to ensure optimal performance.
No, this is a specific replacement part for Alpha boilers, particularly Cb, Sy, and Cd variants. Always check your boiler's manual for the correct part number.
If the expansion vessel fails to absorb pressure, the system pressure will rise too high, potentially causing the safety valve to discharge or leading to damage to other boiler components.
Symptoms include the boiler pressure rising excessively when heating, or the safety valve discharging frequently. A Gas Safe engineer can diagnose the issue.
This is an 8-litre expansion vessel.
Check the pre-charge pressure of the expansion vessel. It may be low or lost its charge, requiring re-pressurization or replacement.
This indicates the expansion vessel is not absorbing pressure correctly. The vessel may be waterlogged, have lost its air charge, or is incorrectly sized. A Gas Safe engineer should inspect and test the vessel.
Ensure all connections are tightened appropriately by the installing engineer. If leaks persist, the vessel or its seals may be faulty and require replacement.
Installation: This expansion vessel *must* be fitted by a certified Gas Safe engineer. Improper installation can lead to system damage or safety hazards. The vessel connects to the heating system via its bottom connection.
Compatibility: This specific model (MPN 1.02356) is designed for Alpha boilers, particularly variants like Cb, Sy, and Cd. Always verify the part number against your boiler's service manual for correct replacement.
Care: Expansion vessels are generally maintenance-free once correctly installed. However, Gas Safe engineers should check the vessel's pre-charge pressure periodically (e.g., during annual servicing) to ensure it is within the manufacturer's specifications. The vessel exterior should be kept clean and free from corrosion.
