Expansion Vessel Reflex S 50, 10 bar / 120°C, grey

The Reflex S 50 expansion vessel is a diaphragm-type pressure vessel designed for heating and hot-water systems. Rated for a maximum operating pressure of 10 bar and temperatures up to 120°C, this grey Reflex S 50 unit provides sealed expansion capacity to accommodate thermal expansion and prevent overpressure in sealed systems. The compact design is intended for domestic and small commercial installations where corrosion resistance and reliable pressure compensation are required.

Advantages

The Reflex S 50 offers stable pressure compensation through a pre-charged diaphragm that separates the system water from the gas cushion, reducing oxygen ingress and corrosion risk. Its construction supports continuous operation at temperatures up to 120°C and a maximum working pressure of 10 bar, ensuring compatibility with most central heating and hot-water circuits. The grey finish and compact footprint simplify installation in plant rooms and boiler cabinets, while the sealed design reduces maintenance compared with open expansion systems.

Suitable for

• Domestic central heating systems
• Small commercial heating and hot-water installations
• Sealed closed-loop hydronic circuits requiring pressure compensation
• Retrofit projects replacing corroded or undersized expansion vessels

Key specifications

• Type: Diaphragm (membrane) expansion vessel
• Nominal volume: 50 litres
• Maximum operating pressure: 10 bar
• Maximum temperature: 120°C
• Colour: Grey
• Application: Heating and hot-water sealed systems

How to use

Mount the Reflex S 50 expansion vessel according to local codes and the heating system manufacturer’s guidance. Connect the vessel to the system at a suitable point in the return or feed line where pressure fluctuations can be absorbed. Pre-charge the gas side to the recommended pressure for the system, taking into account static height and system fill pressure. Verify tightness of connections and check the pre-charge periodically; adjust as necessary to maintain correct system pressure and to ensure the diaphragm operates within its designed range.

Usage recommendations

For optimal performance, match the vessel volume and pre-charge pressure to the system’s calculated expansion volume and static pressure. Inspect the vessel periodically for signs of external damage and confirm pre-charge pressure when the system is depressurised. Do not exceed the specified maximum temperature and pressure ratings of 120°C and 10 bar. Installation and servicing should be performed by qualified personnel familiar with hydronic systems and applicable safety regulations.