Expansion Vessel Reflex DE 80 L 10 bar for Domestic Hot Water, model 7306500

Reflex DE 80 L expansion vessel for domestic hot water systems is a diaphragm-type pressure vessel designed to compensate for volume changes and pressure fluctuations in closed DHW circuits. With an 80-litre usable volume and a maximum allowable pressure of 10 bar, this expansion vessel helps maintain stable system pressure, reduces stress on pipes and fittings, and supports consistent operation of water heaters, boilers and circulation loops in residential or light commercial installations.

Advantages

The diaphragm design separates the gas and water chambers to prevent waterlogging and ensure reliable pressure response over prolonged service life. Built for a 10 bar maximum working pressure, the vessel provides sufficient margin for many domestic and small commercial hot water systems. Its 80 L capacity offers a buffer for larger DHW volumes, reducing frequency of pump cycling and maintaining steadier temperatures. The compact cylindrical shape and standard connection interface simplify integration into existing installations and maintenance procedures.

Suitable for

• Residential domestic hot water systems with larger storage or high draw-off rates
• Small commercial DHW installations such as offices, guest houses or workshops
• Systems that require compensation for thermal expansion and protection of fittings and valves
• Installations where a diaphragm-type expansion vessel is preferred for long-term pressure stability

Key specifications

• Nominal volume: 80 litres
• Maximum working pressure: 10 bar
• Vessel type: diaphragm (separated gas and water chambers)
• Application: closed domestic hot water (DHW) circuits
• Material and finish: corrosion-resistant steel shell with elastomer diaphragm (standard industry materials)
• Connection: standard threaded connection suitable for DHW installations (check system thread and size before installation)

How to use

Install the expansion vessel on the cold-water side of the domestic hot water loop or at a position recommended by system design, ensuring the vessel is securely mounted and accessible for inspection. Before commissioning, check and set the pre-charge pressure of the gas side to match the system’s static pressure per manufacturer guidance; this ensures correct expansion compensation. Connect piping using compatible fittings, vent the system as required, and verify tightness. Periodic inspection of the pre-charge and for signs of diaphragm failure or corrosion is advised as part of routine maintenance.

Usage recommendations

Verify system requirements such as pipework pressure, water temperature ranges and connection dimensions prior to selection. Match the vessel pre-charge to the system static pressure and perform regular checks of pre-charge pressure and overall vessel condition to maintain reliable operation in domestic hot water systems.