Expansion vessel VAREM LR CE 50 L, 3/4" gas connection, 6 bar

The VAREM LR CE 50 L expansion vessel is designed for heating and hot-water systems in residential and light commercial installations. With a nominal capacity of 50 litres and a 3/4" gas connection, this vessel controls pressure variations within closed circuits and helps protect piping and appliances from overpressure. The unit is suitable for systems with a maximum working pressure of 6 bar and is intended to stabilize system pressure during thermal expansion and contraction.

Advantages

The expansion vessel combines a compact cylindrical steel shell with an internal elastomer diaphragm to separate the system fluid from the precharged gas chamber, reducing corrosion and prolonging service life. Its 3/4" gas connection allows straightforward installation on common manifold fittings and pipework. Rated for up to 6 bar, the vessel supports the pressure range typical for domestic heating and hot-water systems and contributes to consistent system performance and reduced cycling of pumps and boilers.

Suitable for

• Domestic central heating systems
• Hot-water circulation and storage systems
• Light commercial boiler installations
• Closed hydronic circuits requiring pressure stabilization

Key specifications

• Nominal capacity: 50 litres
• Connection type: 3/4" gas threaded connection
• Maximum working pressure: 6 bar
• Vessel type: diaphragm expansion vessel
• Application: heating and hot-water systems

How to use

Install the expansion vessel at a suitable point in the closed circuit where it can absorb thermal expansion, typically near the boiler or circulation pump on the system return or supply line as specified by the system designer. Ensure the vessel is mounted securely and oriented according to manufacturer guidance. Before commissioning, check and set the precharge pressure of the gas chamber to match the system static pressure, isolate and depressurize the system when performing maintenance, and follow local codes and safety procedures when connecting to the piping. Regularly inspect the vessel for external damage, proper mounting, and signs of leakage.

Usage recommendations

Verify precharge pressure periodically and adjust it to match system requirements; maintain water chemistry within recommended limits to reduce diaphragm wear. For reliable operation, integrate the vessel with appropriate safety valves, pressure gauges, and a routine maintenance schedule defined by the installation manual and local regulations.