Expansion Vessels & Accessories

As the name implies Unvented Cylinder Systems have no vent pipes, and so when heating water have to provide room for its expansion. This can be accomplished either by accommodating it in an external expansion vessel or, in the case of bubble-top units, an internal air bubble within the unit which is generated when the system is commissioned.

In this section Unvented Components Europe have a large selection of discount external expansion vessels in a huge selection of sizes and from all the major manufacturers such as Zilmet, Flamco, Reliance Water, Vaillant and Varem, all designed to contain the expanding heated water in a hot water system, which can be sited either directly on a unit or, if required, remotely sited with the inlet control group. These units are manufactured from copper, glass-lined steel or stainless steel.

We also have expansion vessels available for combi storage units. This type of system incorporates the benefits, features and controls associated with unvented systems but has a smaller tank and therefore more limited storage capacity for hot water.

1–12 of 13 items

  • Baxi 5114691 expansion vessel

    Baxi 5114691 expansion vessel

    SKU: BX-12-24
    EXCL. TAX £70.01 INCL. TAX £84.01
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  • Flamco Baseflex 12 Membrane Pressure Expansion Vessel

    Flamco Baseflex 12 Membrane Pressure Expansion Vessel

    SKU: 201911
    EXCL. TAX £57.24 INCL. TAX £68.69
    Out of Stock
  • Flamco Baseflex 18 Membrane Pressure Expansion Vessel

    Flamco Baseflex 18 Membrane Pressure Expansion Vessel

    SKU: 201910
    EXCL. TAX £66.78 INCL. TAX £80.14
    Out of Stock
  • Flamco Baseflex 25 Membrane Pressure Expansion Vessel

    Flamco Baseflex 25 Membrane Pressure Expansion Vessel

    SKU: 201909
    EXCL. TAX £76.32 INCL. TAX £91.58
    Out of Stock
  • Flamco Baseflex 35 Membrane Pressure Expansion Vessel

    Flamco Baseflex 35 Membrane Pressure Expansion Vessel

    SKU: 201908
    EXCL. TAX £85.86 INCL. TAX £103.03
    Out of Stock
  • Flamco Baseflex 50 Membrane Pressure Expansion Vessel

    Flamco Baseflex 50 Membrane Pressure Expansion Vessel

    SKU: 201907
    EXCL. TAX £95.40 INCL. TAX £114.48
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  • Flamco Baseflex 8 Membrane Pressure Expansion Vessel

    Flamco Baseflex 8 Membrane Pressure Expansion Vessel

    SKU: 201912
    EXCL. TAX £47.70 INCL. TAX £57.24
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  • Flamco Baseflex 80 Membrane Pressure Expansion Vessel

    Flamco Baseflex 80 Membrane Pressure Expansion Vessel

    SKU: 201906
    EXCL. TAX £104.94 INCL. TAX £125.93
    Out of Stock
  • Grant - 12 Litre Expansion Vessel MPSS01

    Grant – 12 Litre Expansion Vessel MPSS01 13A6001208.1

    SKU: GR-24-4
    EXCL. TAX £44.98 INCL. TAX £53.97
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  • Grant Expansions Vessel VBS124

    Grant Expansions Vessel VBS124

    SKU: VBS124
    EXCL. TAX £73.71 INCL. TAX £88.45
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  • Manco 0.16Ltr Potable Expansion Vessel Shock Arrestor

    Manco 0.16Ltr Potable Expansion Vessel Shock Arrestor

    SKU: MN-7-11
    EXCL. TAX £17.99 INCL. TAX £21.59
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  • EVSV - Tesla 3/4" Expansion Vessel Service Valve Installed

    Tesla 3/4″ Expansion Vessel Service Valve For Heating Vessels (Saves you time and money when servicing or replacing a vessel!)

    SKU: TE-10-23a
    EXCL. TAX £19.07 INCL. TAX £22.89
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