Zilmet Heating Expansion Vessels

Ensure the efficiency and longevity of your closed-loop heating system with the Zilmet CAL-PRO range. Designed by one of the world's leading manufacturers of expansion tanks, the CAL-PRO series is the industry standard for absorbing the thermal expansion of water in pressurised heating circuits.

Every Zilmet heating expansion vessel in the CAL-PRO range is constructed from a high-quality carbon steel shell with professional MIG welding, ensuring a robust structure capable of withstanding constant pressure fluctuations. Inside, a fixed SBR synthetic rubber membrane separates the water from the air cushion, maintaining system pressure and preventing waterlogging.

Can't see the model you need or would simply like to check which size heating vessel you require? Contact our Sales Team today.