Expansion vessel Reflex membrane tank N 400 L for central heating, model 8218000

Reflex membrane tank N 400 L (model 8218000) is a 400‑litre expansion vessel designed for central heating systems. The tank features an internal membrane that separates the heating circuit from the expansion medium, allowing it to absorb thermal volume changes and stabilise system pressure. Its capacity and membrane design make it suitable for residential and light commercial boiler installations where reliable pressure management and reduced pump cycling are required.

Advantages

The Reflex N 400 L expansion vessel provides stable pressure control and reduces the risk of overpressure in the heating circuit. The internal membrane prevents mixing of heating water and the expansion medium, which helps maintain water quality and system longevity. The large 400 L capacity minimises cycling of pumps and boilers under varying load conditions, while robust construction supports safe operation in typical central heating environments.

Suitable for

• Residential central heating systems with significant water volume
• Light commercial boiler plants and small apartment blocks
• Systems requiring reduced pump and boiler cycling
• Installations where separation of expansion medium and heating water is necessary

Key specifications

• Nominal volume: 400 litres
• Membrane-type expansion vessel with internal separating diaphragm
• Application: central heating systems
• Function: absorbs thermal expansion and stabilises system pressure
• Suitable for residential and light commercial installations

How to use

Install the Reflex membrane tank in accordance with national and local plumbing and heating regulations, ensuring correct orientation and secure mounting. Connect the vessel to the heating system at the designated expansion connection point using compatible fittings and ensure the pre-charge pressure of the expansion side is set to match the static system pressure. After installation, bleed the system of air and verify system pressure and membrane integrity during initial commissioning and periodic maintenance.

Usage recommendations

Check and adjust the pre-charge pressure before commissioning and during scheduled maintenance. Inspect the membrane and vessel connections periodically for leaks or signs of wear, and follow manufacturer guidelines for safe installation and pressure settings to ensure optimal performance and system protection.