The Zilmet CAL-PRO expansion vessels absorb the water volume variations in closed heating systems maintaining constant pressure, helping to reduce energy consumption.
The purpose of these vessels is to accommodate the increased liquid volume which occurs during system heating in an Unvented Circuit. A pressurised membrane allows ingress/egress of the liquid only during periods of heating / cooling.
The CAL-PRO range of Expansion Vessels is specifically designed for domestic and commercial unvented central heating systems.
- Crimped or welded carbon steel shells
- Synthetic SBR rubber according to DIN 4807-3 norms suitable for every capacity for maximising tank drawdown.
- Vessels are painted externally with long-lasting epoxy polyester
Capacity: From 4-900 Litres
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