Expansion vessel FLAMCO Baseflex 80 L, 6 bar pressure for heating and domestic systems

The FLAMCO Baseflex 80 L expansion vessel is a diaphragm-type pressure vessel intended for heating and domestic water systems. With an 80-litre working volume and a 6 bar maximum pressure rating, it is designed to absorb thermal expansion and maintain stable system pressure in closed-loop boiler, solar thermal and hot-water circuits. The vessel separates water and air with a durable internal diaphragm to prevent corrosion and ensure consistent performance under variable temperature and pressure conditions.

Advantages

The expansion vessel provides reliable absorption of expansion water, reducing stress on pumps, valves and pipework. Its diaphragm design minimizes air dissolution into the system and helps maintain pressure balance, decreasing the risk of water hammer and frequent system venting. Constructed for compatibility with typical heating installations, it supports continuous operation within the rated pressure range and contributes to longer component service life.

Suitable for

• Closed-loop central heating systems
• Domestic hot-water circuits
• Solar thermal installations with pressurised circuits
• Boiler systems and hydronic heating networks requiring an 80 L buffer

Key specifications

• Volume: 80 litres (working capacity)
• Maximum allowable pressure: 6 bar
• Diaphragm-type separation between air and water
• Suitable for potable and heating water systems where applicable local codes allow
• Corrosion-resistant internal lining and durable external casing

How to use

Install the expansion vessel at an appropriate location in the return line or near the boiler per system design and local regulations. Pre-charge the air side to the manufacturer's recommended pressure for the static system pressure before commissioning. Connect with suitable fittings and isolation valves to allow for pressure checks and maintenance. After filling the system, verify the vessel pre-charge and system pressure under operating temperature to ensure correct absorption of thermal expansion.

Usage recommendations

Check and adjust the pre-charge pressure periodically, especially after major system work or prolonged downtime. Ensure compatibility with system fluids and local standards; if uncertain, consult a qualified heating engineer to confirm sizing and installation details for optimal system protection.