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B&Q£72.08Visit shop B&Q - Ar18 Aquasystem 18 Litre 3.5 Bar Potable Expansion Vessel With Bracket Xves 050 051
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This Reliance Aquasystem 18-litre potable expansion vessel is designed for homeowners and plumbers managing hot water or heating systems. Its key benefit is preventing system over-pressurization caused by water expansion when heated, protecting your plumbing. A potential caveat is the need for correct pre-set pressure matching your system requirements. This vessel features a replaceable membrane to prevent water contamination and system corrosion, and it comes with a 3/4" MBSP connection and a service valve.
| Model Part Number | XVES050050 |
|---|---|
| Brand | Unvented Components Europe |
Its primary function is to absorb the increased volume of water that occurs when a heating or hot water system is heated, preventing dangerous over-pressurization and protecting system components.
Generally, the pre-set pressure should be equal to or slightly lower than the system's static fill pressure. It is best to consult your system's installation manual or a qualified plumber to confirm the correct pressure for your specific setup.
Yes, this potable expansion vessel is suitable for domestic hot water and heating systems. Ensure it is installed on the cold water supply side or as per your system's specific requirements.
The replaceable membrane separates the system water from the air cushion within the vessel. This prevents the air from being absorbed into the water, maintains the air charge, and stops corrosion of the vessel and system components.
It is recommended to have the expansion vessel checked annually by a qualified installer to ensure it is functioning correctly and maintaining the appropriate pressure.
The vessel measures 430mm in height and 280mm in diameter.
While minor adjustments might be possible for some vessels, it is strongly recommended that any pressure adjustment or system-specific tuning be performed by a qualified plumber or heating engineer to avoid damaging the vessel or the system.
Check if the expansion vessel is correctly sized for the system. Verify the pre-set pressure is appropriate and adjust if necessary. Ensure the membrane is intact and not failing.
This can indicate inadequate pressure management. Ensure the expansion vessel is properly charged with air and functioning correctly. Check for other potential causes of water hammer.
This suggests the air charge has been lost or the membrane has failed, allowing water into the air side. The vessel may need servicing or replacement by a professional.
Ensure the 3/4" MBSP connection is properly sealed using appropriate thread sealant or tape. Check that fittings are not damaged and are securely tightened.
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