Pressure Vessels

Pressure Vessels

Pumps UK LTD can provide WRAS Approved high quality steel expansion tanks and pressure vessels across a range of sizes and manufactures. The vessels are designed for heating and chilled water expansion and as draw down vessels on cold water systems.

Our range includes:

Pressure vessel is a closed container made to hold liquids at a pressure different from that of normal ambient pressure. For use in pressure boosting and boiler systems. The vessels have a membrane or diaphragm that is pressurised by an air charge. The water expands against this void. Normally the vessels air charge is equal to the fill pressure of the system before the boiler is turned on. The vessel will start to take expansion when the water starts to heat up.  If vessel sizing or air charge is is incorrect the system will over expand and lift the safety valve in the system. On booster pump systems the vessel charge should be .2 Bar below the cut in pressure of the pump. If the pressure is not correct the pumps will hunt and cause fluctuation in the system.

For more information on any of the expansion tanks we have to offer please contact the office or fill out our online quotation form.


  • Reflex Vessels

    Reflex Vessels

  • Zilmet Vessels - Vertical

    Zilmet Vessels - Vertical

  • Zilmet Vessels - Horizontal

    Zilmet Vessels - Horizontal

  • Varem Vessels - Vertical

    Varem Vessels - Vertical

  • Varem Vessels - Horizontal

    Varem Vessels - Horizontal

  • Cimm Vessels

    Cimm Vessels

  • Lowara Horizontal Vessels

    Lowara Horizontal Vessels

  • Lowara Vertical Vessels

    Lowara Vertical Vessels

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  1. Cimm AFE CE 80 Litre Vertical
  2. Cimm AFO CE 300 Litre Horizontal
  3. Cimm AFESB CE 200
  4. Cimm AFO CE 100 Litre Horizontal
  5. Cimm AFO CE 60 Litre Horizontal
  6. Cimm AFO CE 24 Litre Horizontal
  7. Vertical Pressure Tank
  8. Horizontal Pressure Tank
  9. Varem Horizontal tank
  10. Varem expansion tank
  11. Reflex DE Vessel
  12. Cimm pressure vessel
  13. Cimm pressure vessel
  14. Lowara Horizontal Pressure Vessel
  15. Cimm AFE CE 1500 Litre Vertical
  16. Cimm AFE CE 50 Litre Vertical
  17. Cimm ACS CE 24 Litre Vertical
  18. Cimm ACS CE 18 Litre Vertical

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