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 M Expansion Vessel - 100Ltr - 3-6 Bar

    22000

    Flamco - 100 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 100Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £1,703.86 RRP £1,107.50 £922.92
    In Stock In stock
    Delivery Icon Free Standard Delivery
  9. Flamco Flexcon M Expansion Vessel - 200Ltr - 3-6 Bar

    22001

    Flamco - 200 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 200Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £1,793.53 RRP £1,165.80 £971.50
    In Stock In stock
    Delivery Icon Free Standard Delivery
  10. Flamco Flexcon M Expansion Vessel - 300Ltr - 3-6 Bar

    22002

    Flamco - 300 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 300Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £2,724.40 RRP £1,770.85 £1,475.71
    In Stock In stock
    Delivery Icon Free Standard Delivery
  11. Flamco Flexcon M Expansion Vessel - 400Ltr - 3-6 Bar

    22003

    Flamco - 400 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 400Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £3,097.52 RRP £2,013.38 £1,677.82
    In Stock In stock
    Delivery Icon Free Standard Delivery
  12. Flamco Flexcon M Expansion Vessel - 500Ltr - 3-6 Bar

    22004

    Flamco - 500 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 500Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £3,389.79 RRP £2,203.37 £1,836.14
    In Stock In stock
    Delivery Icon Free Standard Delivery
  13. Flamco Flexcon M Expansion Vessel - 600Ltr - 3-6 Bar

    22005

    Flamco - 600 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 600Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £3,670.34 RRP £2,385.72 £1,988.10
    In Stock In stock
    Delivery Icon Free Standard Delivery
  14. Flamco Flexcon M Expansion Vessel - 800Ltr - 3-6 Bar

    22006

    Flamco - 800 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 800Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £4,296.22 RRP £2,792.54 £2,327.12
    In Stock In stock
    Delivery Icon Free Standard Delivery
  15. Flamco Flexcon M Expansion Vessel - 1000Ltr - 3-6 Bar

    22007

    Flamco - 1000 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 100Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £5,498.17 RRP £3,573.82 £2,978.18
    In Stock In stock
    Delivery Icon Free Standard Delivery
  16. Flamco Flexcon M Expansion Vessel - 1200Ltr - 3-6 Bar

    22108

    Flamco - 1200 Ltr - Flexcon M Expansion Vessel - 3-6 Bar

    Flamco Flexcon M Expansion Vessel - 100Ltr - 3-6 bar. - Tailored for sealed heating and chilled-water systems, the Flexcon M 100/3.0 [6Bar] is a replaceable-bladder expansion vessel designed to stabilise pressure in accordance with EN 12828.

    It excels where static pressure and safety-valve setpoint differ significantly, helping maintain pre-pressure while minimising cycling. Supplied ready to install with a pressure gauge and height-adjustable feet, plus an inspection flange for servicing.

    • Replaceable butyl bladder for fast maintenance
    • Pressure gauge and height-adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish
    • Uncoated connection thread for easy, watertight installation

    For larger models (12008000 Ltrs), a Flexvent Super can be fitted to enhance air removal.

    £7,688.25 RRP £4,997.36 £4,164.47
    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.