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ZI-1300000400B
Zilmet - Cal-Pro Vertical Expansion Vessel - 5 Bar. - 4LtrZilmet Cal-Pro Vertical Expansion Vessel - 5 Bar. - 4Ltr Zilmet CAL‑PRO expansion vessels are designed for sealed heating systems to absorb thermal expansion as water temperature increases.
£65.71 RRP £39.43 £32.86
In stock
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FL-FCST 004
Flamco - 4 Ltr - Flexcon Premium Pressure VesselBuilt for sealed heating (EN 12828) and chilled-water systems, Flexcon Premium Expansion Vessels stabilise system pressure by absorbing thermal expansion so plant runs safely and efficiently.
A new TPO (thermoplastic polyolefin) diaphragm on 1235 Ltrs models delivers high flexibility and extremely low permeability, helping the pre-charge hold for longer. Lighter construction cuts material use and transport emissions; packaging is FSC-certified to reduce CO2 impact.
- Sustainable design lighter TPO membrane uses up to 50% less material
- Long service life 15-year warranty
- Low permeability pre-charge pressure maintained for longer
- Heating & cooling suitable for LPHW and CHW installations
Vessels comply with EN 13831 and the Pressure Equipment Directive 2014/68/EU. Red epoxy powder coating (RAL 3002). Flexcon Premium 3580 are supplied with feet and a mounting kit.
£99.48 RRP £64.67 £53.89
In stock
Free Standard Delivery
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Airfix P03 / 24901
Flamco - 3 Ltr - Airfix P Expansion Vessel - Potable WaterBuilt for sealed potable hot and chilled water systems in domestic and commercial settings, these Potable Water Expansion Vessels stabilise pressure by absorbing thermal expansion for safe, reliable operation.
A nitrogen pre-charge helps retain set pressure longer, while a single threaded steel connection with plastic insert provides a durable, non-flow-through design. Suitable for central heating, cooling and tap water applications (not for solar collector circuits).
- Nitrogen gas filling for longer pre-charge retention
- Single threaded steel connection with plastic insert (no flow-through)
- Potable use supports domestic hot/chilled water
- Heating & cooling compatible for sealed systems
Designed for long service life with broad operating limits and glycol tolerance for demanding installations.
£66.87 RRP £43.46 £36.22
In stock
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GWS-HWB-4LX
HeatWave - Vessel - Inline - 4LtrThe HeatWave Vessel - Inline - 4Ltr is a Pressure Vessel item.
The HeatWave™ series hydronic expansion tanks provide quality protection for closed loop hydronic heating systems from excessive pressure due to thermal expansion.
Easy to install and featuring an incorporated hex nut connection, HeatWave™ tanks feature an air chamber sealed with a brass air valve and O-ring sealed air cap. developed to be supported by either system piping, wall-mounted bracket (inline models) or be freestanding (vertical model with base), the HeatWave™ has a maximum working temperature of 99° C / 210° F .
The operating pressure of this is 6 bar.
- Diaphragm design
- Patented Stainless Steel (vertical models) or chromed steel (inline models) water connection
- Two-part polyurethane, epoxy primed paint finish
- Leak-free, O-ring sealed air valve cap
- Maintenance Free
£48.67 RRP £35.44 £29.53
In stock
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GWS-PWB-4LX
PressureWave - Vessel - Inline - 4LtrIncludes & Benefits
The PressureWave Vessel - Inline - 4Ltr is a Pressure Vessel item.
The operating pressure of this is 10 bar.
- Booster systems
- Well systems
- epoxy primed paint finish
- Leak-free, O-ring sealed air valve cap
£65.30 RRP £47.54 £39.62
In stock
Vessels
Pressure vessels and expansion vessels play a big role in keeping systems safe and balanced. Expansion vessels are commonly used in heating and hot water setups, where they absorb the natural rise in water volume as it heats. This keeps pressure under control, reduces the chance of leaks, and protects boilers, pumps, and pipework from damage.
Pressure vessels are found in pressurised water systems, including potable water supplies. By storing water under pressure, they cut down on pump cycling, extend system life, and deliver a steadier, more reliable flow.
At Pumpify, you’ll find both pressure and expansion vessels in a variety of sizes and specifications, so it’s simple to choose the right fit for your project.