Expansion vessel Reflex N for central heating, model N 300 L (8215300), 300 litres

Reflex N expansion vessel, model N 300 L, is a 300-litre closed-system accumulator designed for central heating installations. It accommodates thermal expansion of the heating medium and helps maintain stable system pressure in closed C.O. systems. The vessel uses a flexible diaphragm to separate the water from the pre-charged air cushion, and its corrosion-resistant construction ensures durable service life in both residential and light-commercial heating applications.

Advantages

The diaphragm design prevents direct contact between the water and the air cushion, reducing gas absorption and maintaining pressure stability. Built from corrosion-resistant materials, the vessel is suitable for long-term operation and requires minimal maintenance. Its 300-litre capacity makes it appropriate for medium to large heating circuits, helping to avoid frequent relief-valve discharge and to reduce load on circulation components.

Suitable for

• Closed central heating systems in residential apartment blocks
• Commercial heating circuits in small to medium-sized buildings
• Installations requiring thermal expansion compensation for water-based heating
• Systems where pressure stability and reduced maintenance are priorities

Key specifications

• Nominal volume: 300 litres
• Type: closed expansion vessel with diaphragm
• Function: accommodates thermal expansion and stabilises system pressure
• Connection: fittings for integration into heating circuits (standard connection type for central heating)
• Construction: corrosion-resistant materials for durable operation

How to use

Install the expansion vessel on the return or other recommended point in the heating circuit according to the installation instructions and local codes. Pre-charge the air side to the specified pressure for the system fill pressure before commissioning, and verify that the diaphragm moves freely with system temperature changes. Ensure correct mechanical support and piping to avoid stress on connections. During routine service, check pre-charge pressure and inspect for external leaks or damage.

Usage recommendations

Set the pre-charge pressure to match the static filling pressure of the heating system minus the recommended margin; re-check the pre-charge after the system is filled and depressurised. Use appropriate mounting brackets and vibration isolation where required, and follow local regulations for placement and safety. For optimal long-term performance, include the expansion vessel in regular heating system maintenance checks.