Drinking water expansion vessels

Drinking water expansion vessels are essential components in domestic hot water systems to manage thermal expansion safely and efficiently. These vessels are designed to accommodate the volume changes caused by temperature fluctuations in closed water systems. The category includes wall-mounted, horizontal, and vertical models with capacities ranging from 2L to 500L. They are suitable for installation in residential and commercial buildings where potable water systems require pressure stabilisation and expansion control.

Products are available with various connection sizes, including 3/4" threads, and are constructed to operate within a temperature range of -10°C to +99°C, with a recommended maximum operating temperature of +80°C. Some models include a built-in manometer for pressure monitoring and are CE marked in accordance with EU pressure equipment directives.

How to choose

• Choose the correct capacity based on the system volume and expected thermal expansion, with options from 2L up to 500L.
• Ensure the vessel has the correct connection type and size, such as 3/4" thread, to match the system piping.
• Verify that the vessel is compatible with potable water systems and features a replaceable EPDM membrane for long-term use.
• Select a model with a suitable orientation—vertical, horizontal, or wall-mounted—based on available installation space.

Frequently asked questions

What is the maximum operating temperature for these vessels?
The recommended maximum operating temperature is +80°C, with a full range of -10°C to +99°C for storage.

Can the membrane be replaced?
Yes, certain models feature a replaceable EPDM membrane in a vacuum-sealed design for easy maintenance.