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 drawdown vessels on cold water systems.

A 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 0.2 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.


  • Imera Vessels

    Imera Vessels

  • 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. Reflex Refix DT 100 Green Expansion Vessel inc. Flowjet 1 1/4 (16bar)
  2. Reflex Refix DT 200 Green Expansion Vessel inc. Flowjet 1 1/4 (16bar)
  3. Reflex Refix DT 200 Green Expansion Vessel Double Connection DN50/PN16 (10bar)

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