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    Potable Expansion Vessels for Cylinders are essential components designed to safely manage water expansion in unvented hot water systems. They maintain system pressure within safe limits, protecting boilers, valves, pipework, and cylinders from damage while ensuring a reliable supply of hot water.

    About Potable Expansion Vessels

    Potable expansion vessels are specially designed for systems that supply drinking water, ensuring all materials in contact with water meet strict health and safety standards. These vessels feature a sealed chamber with a diaphragm or bladder that separates the water from the pre-charged air or nitrogen. As water heats and expands, the diaphragm flexes to absorb the increased volume, maintaining system stability and preventing over-pressurisation.

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    Benefits

    • Safe pressure management: Prevents system damage due to water expansion.
    • Drinking water safe: Constructed from materials approved for potable water use.
    • System protection: Extends the lifespan of cylinders, pumps, and valves.
    • Energy efficiency: Helps maintain consistent water pressure and temperature.
    • Versatile installation: Suitable for domestic and commercial unvented cylinder systems.

    Applications

    • Unvented domestic hot water cylinders.
    • Sealed systems supplying potable water.
    • Commercial and residential heating and hot water systems.
    • Retrofit or replacement installations to improve system safety.

    Key Features

    • High-quality stainless steel or corrosion-resistant construction.
    • Diaphragm or bladder separates potable water from pre-charged air or nitrogen.
    • Pre-charged for immediate use and consistent pressure management.
    • Complies with WRAS and UK Building Regulations for drinking water safety.
    • Available in multiple sizes to match system requirements.

    Performance & Maintenance

    Potable expansion vessels require minimal maintenance but should be inspected periodically to ensure air charge and diaphragm integrity. When properly maintained, they provide reliable protection, consistent hot water pressure, and safe operation of potable water systems.

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