Reliance Water Controls

Reliance Water Controls Heating Expansion Vessels

Reliance supply Aquasystem expansion vessels for both potable hot water systems and heating systems

In the case of expansion vessels for potable hot water they are manufactured to comply with UK water regulations and are tested and certified by WRAS.

All Aquasystem expansion vessels are supplied with a replaceable membrane, which separates the water and air, to prevent contamination of the water system, corrosion of the expansion vessel or pressure loss in the water system.

The main purpose of an expansion vessel is to compensate for the increase in volume of water due to the varying water temperatures in hot water or heating systems. When water is heated it expands and as water is not compressible this increased volume will create a rise in pressure within the system. As an example, water being heated from 0°C-100°C will increase by approx 4.5%.

The expansion vessel allows for this extra space, as when water temperature increases the membrane inside the vessel inflates to allow the water to fill the vessel. The membrane will continue to expand until the system reaches its maximum temperature. Once this has been reached the membrane will be fully inflated and takes up the capacity of the vessel shell. Gradually the temperature will drop, which will in turn decrease the volume of water. Due to the pressure from the pressurised air surrounding the membrane, water will start to exit the vessel until the membrane is deflated.

1–12 of 33 items

  • Aquasystem Expansion Vessel 12 Litre product image

    Reliance – Aquasystem 12 Litre Heating Expansion Vessel with Replaceable Membrane Bracket XVES100045

    SKU: RE-0-4
    EXCL. TAX £40.42 INCL. TAX £48.50
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  • Aquasystem Expansion Vessel 18 Litre product image

    Reliance – Aquasystem 18 Litre Heating Expansion Vessel with Replaceable Membrane Bracket XVES100055

    SKU: RE-0-5
    EXCL. TAX £48.33 INCL. TAX £58.00
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  • Reliance - Aquasystem 24 Litre Heating Expansion Vessel & Sealed System Kit VESK209053

    Aquasystem 24 Litre Heating Vessel & Sealed System Kit VESK209053

    SKU: RE-B-70
    EXCL. TAX £54.50 INCL. TAX £65.40
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  • Warmflow Expansion Vessel Bracket - 2 - 24 Litres

    Expansion Vessel Bracket – 2 – 24 Litres

    SKU: TE-31-3
    EXCL. TAX £4.14 INCL. TAX £4.97
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  • Keston - Bracket

    Keston – Expansion Vessel Bracket

    SKU: KE-31-3
    EXCL. TAX £4.14 INCL. TAX £4.97
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  • Reliance - Aquasystem 100 Litre Heating Expansion Vessel XVES1001000

    Reliance – Aquasystem 100 Litre Heating Expansion Vessel XVES100100

    SKU: RE-24-9
    EXCL. TAX £131.80 INCL. TAX £158.16
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  • Reliance - Aquasystem 1000 Litre Heating Expansion Vessel XVES100170

    Reliance – Aquasystem 1000 Litre Heating Expansion Vessel XVES100170

    SKU: RE-D-244
    EXCL. TAX £1,601.58 INCL. TAX £1,921.90
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  • Reliance - Aquasystem 12 Litre Heating Expansion Vessel & Bracket XVES100040

    Reliance – Aquasystem 12 Litre Heating Expansion Vessel & Bracket XVES100040

    SKU: RE-B-84
    EXCL. TAX £31.23 INCL. TAX £37.47
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  • Reliance - Aquasystem 12 Litre Heating Expansion Vessel & Sealed System Kit VESK209051

    Reliance – Aquasystem 12 Litre Heating Expansion Vessel & Sealed System Kit C/W Bracket

    SKU: RE-B-171
    EXCL. TAX £48.44 INCL. TAX £58.13
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  • Reliance - Aquasystem 12 Litre Heating Expansion Vessel XVES100040

    Reliance – Aquasystem 12 Litre Heating Expansion Vessel XVES100040

    SKU: RE-M-53
    EXCL. TAX £27.06 INCL. TAX £32.47
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  • Reliance - Aquasystem 150 Litre Heating Expansion Vessel XVES100110

    Reliance – Aquasystem 150 Litre Heating Expansion Vessel XVES100110

    SKU: RE-D-246
    EXCL. TAX £207.06 INCL. TAX £248.47
    Out of Stock
  • Reliance - Aquasystem 18 Litre Heating Expansion Vessel & Bracket XVES100050

    Reliance – Aquasystem 18 Litre Heating Expansion Vessel & Bracket XVES100050

    SKU: RE-B-85
    EXCL. TAX £33.29 INCL. TAX £39.95
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