Heating Expansion Vessels

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  1. Reflex N Closed Heating & Cooling System Pressure Vessel - 200Ltr

    REFLEX-8213300

    Reflex - N200 Closed Heating & Cooling System Expansion Vessel - 200Ltr

    The Reflex N 200 diaphragm expansion vessel is designed for sealed heating and cold water systems, providing reliable pressure control in closed-system installations.

    £570.96 RRP £399.67 £333.06
    In Stock In stock
    Delivery Icon Free Standard Delivery
  2. Reflex N Closed Heating & Cooling System Pressure Vessel - 250Ltr

    RE-8214300

    Reflex - N250 Closed Heating & Cooling System Expansion Vessel - 250Ltr

    The Reflex N 250 diaphragm expansion vessel is designed for sealed heating and cold water systems, providing reliable pressure control in closed-system installations.

    £687.62 RRP £481.33 £401.11
    In Stock In stock
    Delivery Icon Free Standard Delivery
  3. Reflex N Closed Heating & Cooling System Pressure Vessel - 300Ltr

    RE-8215300

    Reflex - N300 Closed Heating & Cooling System Expansion Vessel - 300Ltr

    The Reflex N 300 diaphragm expansion vessel is designed for sealed heating and cold water systems, providing reliable pressure control in closed-system installations.

    £818.76 RRP £573.13 £477.61
    In Stock In stock
    Delivery Icon Free Standard Delivery
  4. Reflex N Closed Heating & Cooling System Pressure Vessel - 400Ltr

    RE-8218000

    Reflex - N400 Closed Heating & Cooling System Expansion Vessel - 400Ltr

    The Reflex N 400 diaphragm expansion vessel is designed for sealed heating and cold water systems, providing reliable pressure control in closed-system installations.

    £1,053.14 RRP £737.20 £614.33
    In Stock In stock
    Delivery Icon Free Standard Delivery
  5. Reflex N Closed Heating & Cooling System Pressure Vessel - 500Ltr

    RE-8218300

    Reflex - N500 Closed Heating & Cooling System Expansion Vessel - 500Ltr

    The Reflex N 500 diaphragm expansion vessel is designed for sealed heating and cold water systems, providing reliable pressure control in closed-system installations.

    £1,183.68 RRP £828.58 £690.48
    In Stock In stock
    Delivery Icon Free Standard Delivery
  6. Reflex N Closed Heating & Cooling System Pressure Vessel - 600Ltr

    RE-8218400

    Reflex - N600 Closed Heating & Cooling System Expansion Vessel - 600Ltr

    The Reflex N 600 diaphragm expansion vessel is designed for sealed heating and cold water systems, providing reliable pressure control in closed-system installations.

    £1,382.76 RRP £967.93 £806.61
    In Stock In stock
    Delivery Icon Free Standard Delivery
  7. Flamco Flexcon Expansion Vessel - 1000Ltr

    16903

    Flamco - 1000 Ltr - Flexcon Expansion Vessel - 6 bar

    Flamco Flexcon Expansion Vessel - 1000Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 6.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum / maximum temperature diaphragm: -10 / 70 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £3,100.74 RRP £2,015.48 £1,679.57
    In Stock 2-3 day delivery
    Delivery Icon Free Standard Delivery
  8. Flamco Flexcon Top Expansion Vessel - 110Ltr

    16103

    Flamco - 110 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 110Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £929.65 RRP £604.27 £503.56
    In Stock In stock
    Delivery Icon Free Standard Delivery
  9. Flamco Flexcon Top Expansion Vessel - 140Ltr

    16133

    Flamco - 140 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 140Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £992.37 RRP £645.04 £537.53
    In Stock In stock
    Delivery Icon Free Standard Delivery
  10. Flamco Flexcon Top Expansion Vessel - 200Ltr

    16193

    Flamco - 200 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 200Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £1,282.06 RRP £833.34 £694.45
    In Stock In stock
    Delivery Icon Free Standard Delivery
  11. Flamco Flexcon Top Expansion Vessel - 300Ltr

    16293

    Flamco - 300 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 300Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £1,436.80 RRP £933.92 £778.27
    In Stock In stock
    Delivery Icon Free Standard Delivery
  12. Flamco Flexcon Top Expansion Vessel - 425Ltr

    16413

    Flamco - 425 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 425Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £2,013.44 RRP £1,308.73 £1,090.61
    In Stock 1 week lead time
    Delivery Icon Free Standard Delivery
  13. Flamco Flexcon Top Expansion Vessel - 600Ltr

    16593

    Flamco - 600 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 600Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £2,439.00 RRP £1,585.36 £1,321.13
    In Stock In stock
    Delivery Icon Free Standard Delivery
  14. Flamco Flexcon Top Expansion Vessel - 800Ltr

    16793

    Flamco - 800 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 800Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £3,163.51 RRP £2,056.28 £1,713.57
    In Stock In stock
    Delivery Icon Free Standard Delivery
  15. Flamco Flexcon Top Expansion Vessel - 1000Ltr

    16893

    Flamco - 1000 Ltr - Flexcon Top Expansion Vessel - 10 bar

    Flamco Flexcon Expansion Vessel - 1000Ltr - Engineered for EN 12828 heating and chilled-water systems, this Expansion Vessel stabilises sealed system pressure by absorbing thermal expansion in LPHW/CHW applications.

    Maximum working pressure: 10.0 bar.

    Vessels in accordance with EN13831.

    Suitable for systems with a maximum system temperature of 120 °C.

    Minimum/maximum temperature diaphragm: -10 / 90 °C.

    Suitable for addition of glycol-based anti-freeze up to 50%.

    A flexible rolling diaphragm with a ribbed profile prevents sticking and encourages inflow at the slightest pressure rise, while a nitrogen pre-charge helps maintain set pressure longer. The uncoated connection thread supports quick, watertight installation.

    • Rolling-diaphragm design for smooth expansion control
    • Nitrogen pre-charge for extended pre-pressure retention
    • Top-quality steel with epoxy-powder finish
    • Factory tested for reliability

    Built for long service life in domestic, commercial and industrial plant rooms, with continuous medium temperatures from −10 to 70 C.

    £3,557.55 RRP £2,312.41 £1,927.01
    In Stock In stock
    Delivery Icon Free Standard Delivery
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Heating Expansion Vessels

Heating Expansion Vessels

Heating expansion vessels are a key part of any sealed heating system. As water heats up, it naturally expands. Without a vessel in place, that increase in pressure could damage boilers, pumps, or pipework. An expansion vessel safely absorbs the excessive pressure, keeping the system balanced and protected.

 

By reducing pressure spikes and stress on components, heating expansion vessels help extend the life of your equipment and keep heating systems working reliably day after day. Available in a range of sizes and specifications, they’re designed to suit everything from small domestic systems to larger commercial applications.

 

At Pumpify, you’ll find a range of heating expansion vessels from big-name brands such as Lowara, Zilmet, Reflex, and Flamco. In most cases, they're relatively small. You may even have one in your home or office already! We make it simple to choose the right one and keep your setup running as it should.