Expansion Vessels / Pressure Vessels

(281 products)

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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. Stuart Turner Mainsboost MB 450SV-1-22 Vessel - 450Ltr - Pair

    44471

    Stuart Turner Mainsboost MB 450SV-1-22 Vessel - 450Ltr - Pair

    The 2 vessel Mainsboost 450 litre vertical steel system with 28 mm connections are installed directly onto the incoming water supply and under mains pressure fills with water. When the chamber is full the unit reaches a state of pressure equilibrium. The Mainsboost system now has a volume of pressurised water ready for distribution throughout the property.

    £3,740.40 RRP £2,386.80 £1,989.00
    Free Delivery
    In stock
  3. Stuart Turner Mainsboost MB 450SV-1-22 Vessel - 450Ltr

    44467

    Stuart Turner Mainsboost MB 450SV-1-22 Vessel - 450Ltr

    The Mainsboost MB 450SV features a nominal vessel size of 450 litres and a pressurised water holding capacity of approximately 248 litres.

    £1,869.60 RRP £1,192.80 £994.00
    Free Delivery
    In stock
  4. Flamco Flamcomat FG Vessel - 10000Ltr

    17725

    Flamco Flamcomat FG Vessel - 10000Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £25,326.52 RRP £16,873.79 £14,061.49
    Free Delivery
    In stock
  5. Flamco Flamcomat FG Vessel - 8000Ltr

    17724

    Flamco Flamcomat FG Vessel - 8000Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £24,457.16 RRP £16,294.58 £13,578.82
    Free Delivery
    In stock
  6. Flamco Flamcomat FG Vessel - 6500Ltr

    17723

    Flamco Flamcomat FG Vessel - 6500Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £21,486.09 RRP £14,315.11 £11,929.26
    Free Delivery
    In stock
  7. Flamco Flamcomat FG Vessel - 5000Ltr

    17722

    Flamco Flamcomat FG Vessel - 5000Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £16,534.84 RRP £11,016.34 £9,180.28
    Free Delivery
    In stock
  8. Flamco Flamcomat FG Vessel - 3500Ltr

    17721

    Flamco Flamcomat FG Vessel - 3500Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £15,445.81 RRP £10,290.77 £8,575.64
    Free Delivery
    In stock
  9. Flamco Flamcomat FG Vessel - 2800Ltr

    17720

    Flamco Flamcomat FG Vessel - 2800Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £12,237.47 RRP £8,153.22 £6,794.35
    Free Delivery
    In stock
  10. Flamco Flamcomat FG Vessel - 2000Ltr

    17719

    Flamco Flamcomat FG Vessel - 2000Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £10,343.42 RRP £6,891.31 £5,742.76
    Free Delivery
    In stock
  11. Flamco Flamcomat FG Vessel - 1600Ltr

    17718

    Flamco Flamcomat FG Vessel - 1600Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £8,517.48 RRP £5,674.76 £4,728.97
    Free Delivery
    In stock
  12. Flamco Flamcomat FG Vessel - 1200Ltr

    17717

    Flamco Flamcomat FG Vessel - 1200Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £6,296.59 RRP £4,195.12 £3,495.93
    Free Delivery
    In stock
  13. Flamco Flamcomat FG Vessel - 1000Ltr

    17826

    Flamco Flamcomat FG Vessel - 1000Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £5,723.70 RRP £3,813.42 £3,177.85
    Free Delivery
    In stock
  14. Flamco Flamcomat FG Vessel - 800Ltr

    17825

    Flamco Flamcomat FG Vessel - 800Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £5,218.27 RRP £3,476.66 £2,897.22
    Free Delivery
    In stock
  15. Flamco Flamcomat FG Vessel - 600Ltr

    17824

    Flamco Flamcomat FG Vessel - 600Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £4,570.86 RRP £3,045.35 £2,537.79
    Free Delivery
    In stock
  16. Flamco Flamcomat FG Vessel - 500Ltr

    17823

    Flamco Flamcomat FG Vessel - 500Ltr

    3 Bar. Complete with legs and interchangeable membrane.

    £4,170.30 RRP £2,778.46 £2,315.38
    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.