Comap Airfix E DHW Expansion Vessel 8L, 4.0 bar, 10 bar

The Comap Airfix E DHW expansion vessel is a high-quality component engineered specifically for domestic hot water systems. With a total capacity of 8 liters, this vessel is designed to absorb the expansion of water caused by temperature changes within a heating circuit, thereby preventing dangerous pressure spikes. It features a pre-charge pressure of 4.0 bar and is built to withstand a maximum system pressure of 10 bar, providing a reliable solution for maintaining the integrity and safety of residential plumbing installations.

Advantages

The primary benefit of the Comap Airfix E is its ability to protect the water heating system from excessive pressure, which significantly extends the lifespan of pipes, valves, and water heaters. By managing thermal expansion effectively, it prevents the frequent opening of safety relief valves, which reduces unnecessary water waste. The robust construction ensures long-term durability and consistent performance under varying operational conditions, making it an essential addition to any modern domestic hot water setup.

Suitable for

• Domestic hot water storage tanks
• Residential water heating systems
• Systems requiring stable pressure management
• Installations where thermal expansion needs to be controlled

This expansion vessel may not be suitable for large-scale commercial or industrial heating systems that exceed its 8-liter capacity or require different pressure ratings. It is also not intended for use in closed-loop central heating systems that utilize glycol or other chemical additives, as it is specifically optimized for potable domestic hot water.

Key specifications

• Capacity: 8 liters
• Pre-charge pressure: 4.0 bar
• Maximum system pressure: 10 bar
• Application: Domestic hot water systems

Installation should be performed by a qualified professional to ensure the vessel is correctly integrated into the existing plumbing circuit. The vessel is typically installed on the cold water supply line leading to the water heater. It is important to ensure that the pre-charge pressure is checked and adjusted according to the specific requirements of the installation site before the system is pressurized.

What to consider before purchase

• Verify that the 8-liter capacity is sufficient for your specific water heater volume
• Ensure the 4.0 bar pre-charge pressure matches your system requirements
• Check available space for installation near the water heater
• Confirm compatibility with your local potable water regulations

For optimal performance and safety, it is recommended to inspect the expansion vessel annually to ensure the pre-charge pressure remains within the specified range and that the diaphragm is functioning correctly.