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Zilmet Expansion Vessel

Zilmet expansion vessels are designed for sealed heating systems, helping to maintain stable system pressure as water expands during normal operation. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, Zilmet vessels are widely used in domestic, commercial and plant room heating installations.

Available in a range of capacities to suit different system volumes, Zilmet expansion vessels are factory tested and manufactured in accordance with PED 2014/68/EU requirements. Whether you’re replacing an existing vessel or specifying components for a new heating installation, the range offers a reliable solution for managing pressure changes within sealed heating systems.

Showing 1–16 of 17 results

  • Sale! Zilmet 4L Expansion Vessel 3/4″ BSP 1.5 Bar

    Zilmet 4L Expansion Vessel 3/4″ BSP 1.5 Bar

    Original price was: £50.02£41.68.Current price is: £30.10£25.08. £30.10£25.08 inc VAT Incl. VATExcl. VAT

    Zilmet 4L Expansion Vessel 3/4″ BSP 1.5 Bar  Product Code: 1300000400B The Zilmet 4L Expansion Vessel is designed for sealed domestic heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress….

  • Sale! Zilmet 8L Expansion Vessel 3/4″ BSP 1.5 Bar

    Zilmet 8L Expansion Vessel 3/4″ BSP 1.5 Bar

    Original price was: £50.94£42.45.Current price is: £30.66£25.55. £30.66£25.55 inc VAT Incl. VATExcl. VAT

    Zilmet 8L Expansion Vessel 3/4″ BSP 1.5 Bar The Zilmet 8L Expansion Vessel is designed for sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress. Suitable for domestic…

  • Sale! Zilmet 12L Expansion Vessel 3/4″ BSP 1.5 Bar

    Zilmet 12L Expansion Vessel 3/4″ BSP 1.5 Bar

    Original price was: £57.64£48.03.Current price is: £34.69£28.91. £34.69£28.91 inc VAT Incl. VATExcl. VAT

    Zilmet 12L Expansion Vessel 3/4″ BSP 1.5 Bar Product Code: 1300001200B The Zilmet 12L Expansion Vessel is designed for sealed domestic heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary…

  • Sale! Zilmet 18L Expansion Vessel 3/4″ BSP 1.5 Bar

    Zilmet 18L Expansion Vessel 3/4″ BSP 1.5 Bar

    Original price was: £58.30£48.58.Current price is: £35.09£29.24. £35.09£29.24 inc VAT Incl. VATExcl. VAT

    Zilmet 18L Expansion Vessel 3/4″ BSP 1.5 Bar  Product Code:1300001800B The Zilmet 18L Expansion Vessel is designed for domestic sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress….

  • Sale! Zilmet 24L Expansion Vessel 3/4″ BSP 1.5 Bar

    Zilmet 24L Expansion Vessel 3/4″ BSP 1.5 Bar

    Original price was: £68.02£56.68.Current price is: £40.93£34.11. £40.93£34.11 inc VAT Incl. VATExcl. VAT

    Zilmet 24L Expansion Vessel 3/4″ BSP 1.5 Bar  Product Code: 1300002400B The Zilmet 24L Expansion Vessel is designed for sealed domestic heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress….

  • Sale! Zilmet 35L Expansion Vessel 3/4″ BSP 1.5 Bar

    Zilmet 35L Expansion Vessel 3/4″ BSP 1.5 Bar

    Original price was: £126.88£105.73.Current price is: £76.37£63.64. £76.37£63.64 inc VAT Incl. VATExcl. VAT

    Zilmet 35L Expansion Vessel 3/4″ BSP 1.5 Bar    Product Code: 1300003503 The Zilmet 35L Expansion Vessel is designed for sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress. Suitable…

  • Sale! Zilmet 50L Expansion Vessel 3/4″ BSP 2.5 Bar

    Zilmet 50L Expansion Vessel 3/4″ BSP 2.5 Bar

    Original price was: £182.78£152.32.Current price is: £110.02£91.68. £110.02£91.68 inc VAT Incl. VATExcl. VAT

    Zilmet 50L Expansion Vessel 3/4″ BSP 1.5 Bar  Product Code:1300005003 The Zilmet 50L Expansion Vessel is designed for sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress. Suitable…

  • Sale! Zilmet 80L Expansion Vessel 3/4″ BSP 2.5 Bar

    Zilmet 80L Expansion Vessel 3/4″ BSP 2.5 Bar

    Original price was: £264.48£220.40.Current price is: £159.19£132.66. £159.19£132.66 inc VAT Incl. VATExcl. VAT

    Zilmet 80L Expansion Vessel 3/4″ BSP 2.5 Bar  Product Code:1300008003 The Zilmet 80L Expansion Vessel is designed for sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress. Suitable…

  • Sale! Zilmet 105L Expansion Vessel 3/4" BSP 2.5 Bar

    Zilmet 105L Expansion Vessel 3/4″ BSP 2.5 Bar

    Original price was: £343.69£286.41.Current price is: £206.87£172.39. £206.87£172.39 inc VAT Incl. VATExcl. VAT

    Zilmet 105L Expansion Vessel 3/4″ BSP 2.5 Bar The Zilmet 105L Expansion Vessel is designed for sealed commercial heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary stress. Suitable for…

  • Sale! Zilmet 150L Expansion Vessel 3/4" BSP 2.5 B

    Zilmet 150L Expansion Vessel 3/4″ BSP 2.5 B

    Original price was: £436.32£363.60.Current price is: £262.62£218.85. £262.62£218.85 inc VAT Incl. VATExcl. VAT

    Zilmet 150L Expansion Vessel 3/4″ BSP 2.5 Bar    Product Code: 1300015000 The Zilmet 150L Expansion Vessel is designed for sealed commercial heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from…

  • Sale! Zilmet 200L Expansion Vessel 3/4" BSP 2.5 Bar

    Zilmet 200L Expansion Vessel 3/4″ BSP 2.5 Bar

    Original price was: £549.88£458.23.Current price is: £330.96£275.80. £330.96£275.80 inc VAT Incl. VATExcl. VAT

    Zilmet 200L Expansion Vessel 3/4″ BSP 2.5 Bar  Part No: 1300020000. The Zilmet 200L Expansion Vessel is designed for sealed commercial heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary…

  • Sale! Zilmet 250L Expansion Vessel 3/4" BSP 2.5 Bar

    Zilmet 250L Expansion Vessel 3/4″ BSP 2.5 Bar

    Original price was: £692.75£577.29.Current price is: £416.96£347.47. £416.96£347.47 inc VAT Incl. VATExcl. VAT

    Zilmet 250L Expansion Vessel 3/4″ BSP 2.5 Bar  Product code: 1300025000 The Zilmet 250L Expansion Vessel is designed for sealed commercial heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary…

  • Sale! Zilmet 300L Expansion Vessel 3/4" BSP 2.5 Bar

    Zilmet 300L Expansion Vessel 3/4″ BSP 2.5 Bar

    Original price was: £833.32£694.43.Current price is: £501.56£417.97. £501.56£417.97 inc VAT Incl. VATExcl. VAT

    Zilmet 300L Expansion Vessel 3/4″ BSP 2.5 Bar  Part No: 1300030000 The Zilmet 300L Expansion Vessel is designed for sealed commercial heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary…

  • Sale! Zilmet 400L Expansion Vessel 3/4" BSP 2.5 Bar

    Zilmet 400L Expansion Vessel 3/4″ BSP 2.5 Bar

    Original price was: £1,103.75£919.79.Current price is: £664.33£553.61. £664.33£553.61 inc VAT Incl. VATExcl. VAT

    Zilmet 400L Expansion Vessel 3/4″ BSP 2.5 Bar  Part No: 1300040000. The Zilmet 400L Expansion Vessel is designed for large, sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary…

  • Sale! Zilmet 500L Expansion Vessel 1" BSP 2.5 Bar

    Zilmet 500L Expansion Vessel 1″ BSP 2.5 Bar

    Original price was: £1,386.74£1,155.62.Current price is: £834.67£695.56. £834.67£695.56 inc VAT Incl. VATExcl. VAT

    Zilmet 500L Expansion Vessel 1″ BSP 2.5 Bar  Part No: 1300050000. The Zilmet 500L Expansion Vessel is designed for large, sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary…

  • Sale! Zilmet 600L Expansion Vessel 1" BSP 2.5 Bar

    Zilmet 600L Expansion Vessel 1″ BSP 2.5 Bar

    Original price was: £1,859.63£1,549.69.Current price is: £1,119.30£932.75. £1,119.30£932.75 inc VAT Incl. VATExcl. VAT

    Zilmet 600L Expansion Vessel 1″ BSP 2.5 Bar  Part No: 1300060000. The Zilmet 600L Expansion Vessel is designed for large, sealed heating systems, helping to absorb increases in water volume as system temperatures rise. Manufactured from carbon steel with a synthetic butyl rubber diaphragm, it helps maintain stable system pressure and protect components from unnecessary…