Zilmet CAL‑PRO 24L Heating Expansion Vessel

Zilmet CAL‑PRO 24L Heating Expansion Vessel

Keep your sealed central heating system running safely and reliably with the Zilmet CAL-PRO 24 L Expansion Vessel. Designed to handle thermal expansion in modern heating systems, this robust vessel helps maintain stable pressure, protect boiler components and prevent pressure-related faults.

Key Features

• 24 Litre Capacity – Ideal for medium domestic sealed heating systems to manage water expansion effectively.

• Durable Construction – Strong steel body with a flexible synthetic rubber diaphragm for long-lasting performance.

• Factory Pre-Charged – Ready to install with pre-charged air pressure, simplifying setup.

• Pressure Protection – Helps prevent high pressure spikes and safety valve discharge, protecting boilers and pipework.

• Compact, Wall-Mountable Design – Space-saving vessel that’s easy to fit with standard ¾″ BSP connection.

• Standards-Compliant – Built and tested to EN 13831 for reliable central heating performance.

Why It Matters

As water is heated in a sealed system, it expands — increasing internal pressure. Without an expansion vessel to absorb this rise, boilers and components can experience stress, leaks or safety valve discharge. The Zilmet 24 L expansion vessel keeps pressure within safe limits, reducing wear and improving system longevity.

Ideal For

• Domestic sealed central heating systems

• Replacement of waterlogged or failed expansion vessels

• Heating system upgrades or boiler changes

Reliable pressure control for efficient heating system performance — built by a global leader in expansion vessel technology.