Expansion vessel Reflex DE 33 L 10 bar for domestic hot water (Reflex 7303913)

The Reflex DE expansion vessel 33 L 10 bar is designed for domestic hot water systems to compensate thermal expansion and stabilize system pressure. With a nominal 33‑litre capacity and a maximum allowable pressure of 10 bar, this compact vessel is intended for residential hot water installations, boilers and indirect water heater systems where protecting piping and components from pressure fluctuations is required.

Advantages

The expansion vessel reduces pressure spikes by absorbing excess volume created when water heats, helping to maintain a stable operating pressure in DHW systems. Its compact cylindrical design makes it suitable for installations with limited space and simplifies integration into existing plumbing. Constructed for reliable cyclic operation, the vessel supports long service life when installed and maintained according to system requirements.

Suitable for

• Residential domestic hot water (DHW) systems
• Boiler-fed hot water installations
• Indirect water heaters and storage tanks
• Systems requiring pressure stabilisation and overpressure protection

Key specifications

• Working volume: 33 litres
• Maximum service pressure: 10 bar
• Application: domestic hot water (DHW) systems
• Design: compact cylindrical expansion vessel suitable for wall or floor location depending on installation
• Function: compensates thermal expansion and stabilises system pressure

How to use

Install the expansion vessel in accordance with applicable plumbing codes and the system manufacturer’s instructions. Connect the vessel to the domestic hot water circuit at a location that allows it to intercept thermal expansion, typically near the water heater or boiler return. Ensure the vessel pre-charge pressure is set appropriately for the static pressure of the installation before commissioning. Periodically inspect for leaks and verify the pre-charge pressure during routine maintenance.

Usage recommendations

Verify compatibility with the system operating pressure and water chemistry. Adjust pre-charge pressure to match the cold static pressure of the installation and follow regular inspection intervals to confirm the vessel maintains correct pressure and integrity.