Expansion vessels

Pressure and expansion vessels are an essential part of modern heating, water supply, and solar systems. Their main task is to maintain stable pressure and absorb volume changes in water during heating or pumping, thereby protecting pumps from frequent switching, reducing the risk of pipe damage, and ensuring long-term reliability of the entire system.

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Our range covers:

  • Cold water vessels – ideal for domestic waterworks and booster stations, with certified bags for safe use with drinking water.
  • Hot water and DHW vessels – with surface treatment and materials resistant to high temperatures and corrosion.
  • Expansion vessels for heating – designed for optimal compensation of water volume changes at normal operating temperatures and pressures of heating systems.
  • Special vessels for solar systems – resistant to higher temperatures and pressures occurring in solar circuits.

The range also includes replacement bags and flanges, which allow for easy and economical maintenance without the need to replace the entire vessel.

Before choosing a vessel, we recommend that you familiarize yourself with our detailed instructions:

  • How a cold water pressure vessel works – understand how to size it correctly and what affects the pressure
  • How a hot water pressure vessel works – what to look out for with DHW, where the temperature is higher
  • What to look out for – Legionella in the system – important information about hygiene and bacteria prevention

Technical parameters to focus on:

  • Vessel volume – determines how much water it can hold and how well it compensates for pressure surges
  • Maximum and minimum working pressure – must correspond to your system and pump
  • Material and construction of the bladder – most often butyl rubber with drinking water certification, resistant to heat and chemicals
  • Surface treatment of the tank – anti-corrosion coating or enamel for longer life
 

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Maximum pressure

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