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Expansion Vessels

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    Expansion Vessels

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    Expansion Vessels for Cylinders are essential components in unvented hot water systems, designed to safely accommodate the natural expansion of water as it heats. By absorbing the increased pressure within the cylinder, these vessels protect the system from damage and ensure consistent, safe operation.

    About Expansion Vessels

    Expansion vessels are typically installed alongside unvented hot water cylinders and include a flexible diaphragm or bladder that separates air and water. As the water in the cylinder heats and expands, the vessel compresses the air on one side to absorb the extra volume, preventing unwanted pressure build-up. This helps maintain the performance, safety, and longevity of the entire hot water system.

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    Benefits

    • Pressure regulation: Prevents system damage by safely absorbing expanding water pressure.
    • System protection: Extends the lifespan of cylinders, valves, and other components.
    • Improved safety: Reduces the risk of leaks or ruptures caused by over-pressurisation.
    • Maintenance efficiency: Helps systems operate quietly and smoothly over time.
    • Versatile installation: Suitable for a wide range of domestic and commercial unvented systems.

    Applications

    • Unvented hot water storage systems.
    • Domestic and commercial hot water cylinders.
    • Systems where water expansion needs to be safely managed.
    • Retrofit or replacement installations for system upgrades.

    Key Features

    • Durable steel construction with corrosion-resistant internal lining.
    • Replaceable diaphragm or bladder for easy maintenance.
    • Pre-charged with air or nitrogen for optimal performance.
    • Compact, wall-mountable or floor-standing designs available.
    • Complies with UK Building Regulations and WRAS standards.

    Performance & Maintenance

    Expansion vessels require periodic inspection to check air pressure levels and ensure the diaphragm remains intact. When maintained properly, they deliver long-lasting pressure stability and protect the entire unvented system from excessive stress.

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      Expansion Vessels

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