Pressure & Expansion Vessels

Pressure & Expansion 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

    Zilmet Vessels

  • Varem Vessels

    Varem Vessels

  • Cimm Vessels

    Cimm Vessels

  • Lowara Vessels

    Lowara Vessels

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  1. Lowara 5 LV Vertical Expansion Tank
  2. Lowara 8 LV Vertical Expansion Tank
  3. Lowara 18 LV Vertical Expansion Tank
  4. Lowara 24 LV Vertical Expansion Tank
  5. Lowara 24 LH Horizontal Expansion Tank
  6. Lowara 50 LH Horizontal Expansion Tank
  7. Lowara 60 LV Vertical Expansion Tank
  8. Lowara 60 LH Horizontal Expansion Tank
  9. Lowara 80 LV Vertical Expansion Tank
  10. Lowara 80 LH Horizontal Expansion Tank
  11. Lowara 100 LV Vertical Expansion Tank
  12. Lowara 100 LH Horizontal Expansion Tank
  13. Lowara 200 LV Vertical Expansion Tank
  14. Lowara 200 LH Horizontal Expansion Tank
  15. Lowara 300 LV Vertical Expansion Tank
  16. Lowara 300 LH Horizontal Expansion Tank
  17. Lowara 500 LV Vertical Expansion Tank
  18. Lowara 750 LV Vertical Expansion Tank

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