Expansion Vessels / Pressure Vessels

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  1. Potable Water Expansion / Pressure Vessels

    Closed heating and hot water systems, unlike ol ...

  2. Heating & Cooling Expansion Vessels

    At Pump Sales Direct we stock a range of expans ...

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  1. Wilo XT500V 500 Litre Verticle Vessel
    £644.28 £536.90
    Free Delivery
    In stock
  2. Grundfos GT-H-18 Vertical Cold Water Diaphragm Tank - 10 Bar - 18 Ltr

    96526322

    Grundfos GT-H-18 Vertical Cold Water Diaphragm Tank - 10 Bar - 18 Ltr

    The GT-H tanks are steel pressure tanks with a non-toxic butyl rubber diaphragm with a precision-moulded polypropylene liner for superior air and water separation. Recommend application: Drinking water.

    £122.40 RRP £51.59 £42.99
    In stock
  3. Grundfos GT-H-8 - Vertical Cold Water Diaphragm Tank - 10 Bar - 8 Ltr

    96528335

    Grundfos GT-H-8 - Vertical Cold Water Diaphragm Tank - 10 Bar - 8 Ltr

    The GT-H tanks are steel pressure tanks with a non-toxic butyl rubber diaphragm with a precision-moulded polypropylene liner for superior air and water separation. Recommend application: Drinking water.

    £81.60 RRP £39.59 £32.99
    In stock
  4. Grundfos GT-HR-1000 Vertical Hot Water Diaphragm Tank - 6 Bar - 1000 Ltr

    96573408

    Grundfos GT-HR-1000 Vertical Hot Water Diaphragm Tank - 6 Bar - 1000 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £3,108.00 RRP £1,329.12 £1,107.60
    Free Delivery
    In stock
  5. Grundfos GT-HR-140 Vertical Hot Water Diaphragm Tank - 6 Bar - 140 Ltr

    96573398

    Grundfos GT-HR-140 Vertical Hot Water Diaphragm Tank - 6 Bar - 140 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £450.00 RRP £193.44 £161.20
    Free Delivery
    In stock
  6. Grundfos GT-HR-200 Vertical Hot Water Diaphragm Tank - 6 Bar - 200 Ltr

    96573399

    Grundfos GT-HR-200 Vertical Hot Water Diaphragm Tank - 6 Bar - 200 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £660.00 RRP £283.92 £236.60
    Free Delivery
    In stock
  7. Grundfos GT-HR-250 Vertical Hot Water Diaphragm Tank - 6 Bar - 250 Ltr

    96573400

    Grundfos GT-HR-250 Vertical Hot Water Diaphragm Tank - 6 Bar - 250 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £816.00 RRP £351.00 £292.50
    Free Delivery
    In stock
  8. Grundfos GT-HR-300 Vertical Hot Water Diaphragm Tank - 6 Bar - 300 Ltr

    96573401

    Grundfos GT-HR-300 Vertical Hot Water Diaphragm Tank - 6 Bar - 300 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £873.60 RRP £372.84 £310.70
    Free Delivery
    In stock
  9. Grundfos GT-HR-400 Vertical Hot Water Diaphragm Tank - 6 Bar - 400 Ltr

    96573403

    Grundfos GT-HR-400 Vertical Hot Water Diaphragm Tank - 6 Bar - 400 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £1,185.60 RRP £508.56 £423.80
    Free Delivery
    In stock
  10. Grundfos GT-HR-50 Vertical Hot Water Diaphragm Tank - 6 Bar - 50 Ltr

    96573395

    Grundfos GT-HR-50 Vertical Hot Water Diaphragm Tank - 6 Bar - 50 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £178.80 RRP £83.99 £69.99
    Free Delivery
    In stock
  11. Grundfos GT-HR-500 Vertical Hot Water Diaphragm Tank - 6 Bar - 500 Ltr

    96573404

    Grundfos GT-HR-500 Vertical Hot Water Diaphragm Tank - 6 Bar - 500 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £1,425.60 RRP £609.96 £508.30
    Free Delivery
    In stock
  12. Grundfos GT-HR-600 Vertical Hot Water Diaphragm Tank - 6 Bar - 600 Ltr

    96573405

    Grundfos GT-HR-600 Vertical Hot Water Diaphragm Tank - 6 Bar - 600 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £1,754.40 RRP £750.36 £625.30
    Free Delivery
    In stock
  13. Grundfos GT-HR-80 Vertical Hot Water Diaphragm Tank - 6 Bar - 80 Ltr

    96573396

    Grundfos GT-HR-80 Vertical Hot Water Diaphragm Tank - 6 Bar - 80 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £290.40 RRP £124.80 £104.00
    Free Delivery
    In stock
  14. Grundfos GT-HR-800 Vertical Hot Water Diaphragm Tank - 6 Bar - 800 Ltr

    96573407

    Grundfos GT-HR-800 Vertical Hot Water Diaphragm Tank - 6 Bar - 800 Ltr

    The GT-HR tanks are steel pressure tank with a non-replaceable rubber diaphragm, pre-charged with nitrogen. Recommend application: Heating water.

    £2,499.60 RRP £1,070.16 £891.80
    Free Delivery
    In stock
  15. Grundfos GT-U-8 Vertical Cold Water Bladder Tank - 25 Bar - 8 Ltr

    96573347

    Grundfos GT-U-8 Vertical Cold Water Bladder Tank - 25 Bar - 8 Ltr

    The GT-U tanks are steel pressure tanks with a replaceable, non-toxic butyl rubber bladder enclosed by compressed nitrogen. Recommend application: Grey water and Drinking water.

    £136.80 RRP £119.83 £99.86
    Free Delivery
    In stock
  16. Reflex DE Pressure Vessel - 60Ltr

    RE-7306400

    Reflex DE Pressure Vessel - 60Ltr

    Reflex DE 60L Vessel for heating and chilled water applications. This vessel has threaded connections and has a Max. working pressure of 10 bar with a Max. operating temperature of 70c. It comes pre-pressurised at 4.0 bar.

    £144.00 £120.00
    Free Delivery
    In stock
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An expansion vessel is used to protect closed central heating systems from becoming overloaded by excessive pressure. It is a small tank or container that is divided in to two.

It provides a cushion against any shocks caused by small influxes of air that lead to increased air pressure in the system. This can also occur when the water hammer absorbs too much pressure as a result of thermal expansion.

Expansion vessels are most commonly used to remove the need for a continuous pump in a pumped central heating system. The user can configure a low and high pressure level on the pump settings. When the water pressure reaches the lowest setting, the pump will engage and fill the vessel to the high pressure point. When it reaches this point the pump still stop.

Once this cycle has been completed, the expansion vessel will maintain the stored water at high pressure levels, ensuring a better and more consistent water flow. If the pressure in the vessel drops to the lower point, the pump will kick in and the cycle begins again.

An expansion or pressure vessel can be used in the home for the supply of drinking water. When used with a boiler, an expansion vessel can help maintain water pressure to ensure showers reach full power on demand.

All tanks and containers supplied by Pump Sales Direct are manufactured to comply with UK water regulations when used in this application. Pump Sales Direct supply expansion vessels for Europe’s leading manufacturers, including Airfix, Flexcon, Gitral, Grundfos, Heatwave, PressureWave, Reflex, Varem and ZILMET.