Zilmet CAL-PRO Heating Expansion Vessels
The Zilmet Cal-Pro Expansion Vessel is a robust, maintenance-free solution designed to manage thermal expansion in closed-loop heating systems. By absorbing excess pressure caused by heated water, it protects boilers, pipes, and radiators from damage, ensuring efficient and reliable operation.
Key Specifications
Capacity Range: 8–35 litres (suitable for small domestic to light commercial systems).
Maximum Working Pressure: 10 bar / 145 psi.
Factory Pre-Charge Pressure: 1.5 bar / 22 psi (adjustable for system requirements).
Maximum Temperature: 100°C / 212°F.
Connection Size: 1" BSP female thread (standard for UK heating systems).
Diaphragm Material: High-grade nitrile rubber (resistant to wear and corrosion).
Shell Material: Carbon steel with epoxy-coated finish for durability.
Product Details
Features & Benefits
Pressure Stabilisation: Prevents pressure spikes in heating systems, extending equipment lifespan.
Compact Design: Space-saving and easy to install in boiler rooms or compact spaces.
Adjustable Pre-Charge: Customisable to match system static pressure.
Corrosion-Resistant: Epoxy coating protects against rust in damp environments.
Compliance: Meets UK and EU standards for heating system components.
Typical Applications
Domestic and commercial boiler systems.
Underfloor heating circuits.
Solar thermal installations.
Installation Notes
Mount vertically to optimise diaphragm performance.
Ensure pre-charge pressure matches system static pressure before installation.
Consult a Gas Safe registered engineer for compliance with UK building regulations.
