Heating Expansion Vessels

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  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. Flamco Flexcon M Expansion Vessel - 100Ltr - 6-10 Bar

    22010

    Flamco - 100 Ltr - Flexcon M Expansion Vessel - 6-10 Bar

    Built for sealed heating and chilled-water circuits, the Flexcon M [10Bar] is a replaceable-bladder expansion vessel designed to stabilise system pressure in line with EN 12828.

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

    • Replaceable bladder for fast maintenance and long service life
    • Delivered ready to install: gauge and adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish

    Larger Flexcon M models (12008000 Ltrs) can be fitted with a Flexvent Super for enhanced air removal.

    £1,763.02 RRP £1,145.96 £954.97
    In Stock In stock
    Delivery Icon Free Standard Delivery
  10. Flamco Flexcon M Expansion Vessel - 200Ltr - 6-10 Bar

    22011

    Flamco - 200 Ltr - Flexcon M Expansion Vessel - 6-10 Bar

    Built for sealed heating and chilled-water circuits, the Flexcon M [10Bar] is a replaceable-bladder expansion vessel designed to stabilise system pressure in line with EN 12828.

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

    • Replaceable bladder for fast maintenance and long service life
    • Delivered ready to install: gauge and adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish

    Larger Flexcon M models (12008000 Ltrs) can be fitted with a Flexvent Super for enhanced air removal.

    £2,141.98 RRP £1,392.29 £1,160.24
    In Stock In stock
    Delivery Icon Free Standard Delivery
  11. Flamco Flexcon M Expansion Vessel - 300Ltr - 6-10 Bar

    22012

    Flamco - 300 Ltr - Flexcon M Expansion Vessel - 6-10 Bar

    Built for sealed heating and chilled-water circuits, the Flexcon M [10Bar] is a replaceable-bladder expansion vessel designed to stabilise system pressure in line with EN 12828.

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

    • Replaceable bladder for fast maintenance and long service life
    • Delivered ready to install: gauge and adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish

    Larger Flexcon M models (12008000 Ltrs) can be fitted with a Flexvent Super for enhanced air removal.

    £2,729.86 RRP £1,774.40 £1,478.67
    In Stock In stock
    Delivery Icon Free Standard Delivery
  12. Flamco Flexcon M Expansion Vessel - 400Ltr - 6-10 Bar

    22013

    Flamco - 400 Ltr - Flexcon M Expansion Vessel - 6-10 Bar

    Built for sealed heating and chilled-water circuits, the Flexcon M [10Bar] is a replaceable-bladder expansion vessel designed to stabilise system pressure in line with EN 12828.

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

    • Replaceable bladder for fast maintenance and long service life
    • Delivered ready to install: gauge and adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish

    Larger Flexcon M models (12008000 Ltrs) can be fitted with a Flexvent Super for enhanced air removal.

    £3,402.43 RRP £2,211.59 £1,842.99
    In Stock In stock
    Delivery Icon Free Standard Delivery
  13. Flamco Flexcon M Expansion Vessel - 600Ltr - 6-10 Bar

    22014

    Flamco - 600 Ltr - Flexcon M Expansion Vessel - 6-10 Bar

    Built for sealed heating and chilled-water circuits, the Flexcon M [10Bar] is a replaceable-bladder expansion vessel designed to stabilise system pressure in line with EN 12828.

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

    • Replaceable bladder for fast maintenance and long service life
    • Delivered ready to install: gauge and adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish

    Larger Flexcon M models (12008000 Ltrs) can be fitted with a Flexvent Super for enhanced air removal.

    £4,009.81 RRP £2,606.38 £2,171.98
    In Stock In stock
    Delivery Icon Free Standard Delivery
  14. Flamco Flexcon M Expansion Vessel - 800Ltr - 6-10 Bar

    22015

    Flamco - 800 Ltr - Flexcon M Expansion Vessel - 6-10 Bar

    Built for sealed heating and chilled-water circuits, the Flexcon M [10Bar] is a replaceable-bladder expansion vessel designed to stabilise system pressure in line with EN 12828.

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

    • Replaceable bladder for fast maintenance and long service life
    • Delivered ready to install: gauge and adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish

    Larger Flexcon M models (12008000 Ltrs) can be fitted with a Flexvent Super for enhanced air removal.

    £5,707.11 RRP £3,709.62 £3,091.35
    In Stock In stock
    Delivery Icon Free Standard Delivery
  15. Flamco Flexcon M Expansion Vessel - 1200Ltr - 6-10 Bar

    22148

    Flamco - 1200 Ltr - Flexcon M Expansion Vessel - 6-10 Bar

    Built for sealed heating and chilled-water circuits, the Flexcon M [10Bar] is a replaceable-bladder expansion vessel designed to stabilise system pressure in line with EN 12828.

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

    • Replaceable bladder for fast maintenance and long service life
    • Delivered ready to install: gauge and adjustable feet included
    • Inspection flange for internal access
    • Robust steel vessel with durable epoxy-powder finish

    Larger Flexcon M models (12008000 Ltrs) can be fitted with a Flexvent Super for enhanced air removal.

    £9,935.17 RRP £6,457.86 £5,381.55
    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.