Expansion Vessel CIMM SOLAR 18 L, Pressure Range 2.5–10 bar, Temperature -10 to +100 °C

The CIMM SOLAR 18 L expansion vessel is engineered for closed-loop solar thermal and heating systems to manage thermal expansion and stabilize hydraulic pressure. Designed for operating pressures from 2.5 to 10 bar and temperatures from -10 to +100 °C, this expansion vessel reduces the risk of overpressure, minimizes cavitation and water hammer, and helps maintain consistent system performance in circulating solar collectors, boilers and heat exchangers.

Advantages

This expansion vessel offers a compact 18-litre capacity with a pressure range suitable for medium- and high-pressure solar and heating installations. Constructed to withstand fluctuating temperatures from sub-zero to high operating values, it provides reliable hydraulic compensation and contributes to prolonging the service life of pumps, valves and heat exchangers. The device supports stable system pressure, reducing maintenance needs and improving operational safety.

Suitable for

• Closed-loop solar thermal collector circuits
• Domestic and commercial boiler systems
• Heat exchanger circuits and hydronic heating loops
• Systems requiring protection against water hammer and cavitation

Key specifications

• Nominal volume: 18 L
• Operating pressure range: 2.5–10 bar
• Operating temperature range: -10 to +100 °C
• Application type: closed-loop solar and heating systems

How to use

Install the expansion vessel in the system at a location that allows connection to the primary circuit where pressure fluctuations occur, typically near the pump or manifold. Ensure correct orientation and secure mounting according to local installation standards. Pre-charge the vessel to the recommended pre-charge pressure for the specific system (matching the static system pressure) before connecting to the circuit. After connection, bleed any air from the system and verify pressure settings under normal operating temperature and load conditions.

Usage recommendations

Verify compatibility with system fluid and antifreeze concentration, maintain the pre-charge pressure periodically, and inspect for signs of corrosion or membrane failure. For safe and effective operation, follow local regulations and installer guidelines when integrating the expansion vessel into solar thermal or heating installations.