Expansion vessel for heating Reflex 25 l

Reflex expansion vessel with a nominal volume of 25 liters, designed for closed hot-water heating systems. The diaphragm-type pressure vessel accommodates thermal expansion of the heating medium and helps stabilise system pressure during temperature changes. It is intended for installation on the heating circuit to reduce pressure peaks, limit water loss and decrease mechanical stress on system components.

Advantages

The diaphragm design separates the air and liquid volumes to maintain consistent pre-charge pressure and reduce gas absorption into the heating medium. Its 25 l capacity makes it suitable for typical residential and small commercial installations where moderate expansion volumes are required. By smoothing pressure fluctuations the vessel contributes to longer service life of pumps, valves and heat exchangers and helps prevent frequent automatic venting or safety valve activation.

Suitable for

• Closed hot-water heating systems in residential buildings
• Small commercial heating installations
• Systems requiring reduction of pressure peaks and water losses
• Installations where a compact 25 l expansion capacity is sufficient

Key specifications

• Nominal volume: 25 litres
• Diaphragm-type pressure vessel separating air and liquid
• Designed for closed heating circuits
• Compact cylindrical body suitable for wall or pipe mounting
• Materials compatible with standard heating media (water/glycol mixtures)

How to use

Install the expansion vessel on the return pipe of the heating circuit or at the location recommended by the system designer, ensuring secure mechanical support and correct orientation. Pre-charge the vessel to the system pre-charge pressure specified for the heating installation and check for leaks. During commissioning, verify that the vessel absorbs expansion and that system pressure remains within the target range when the system heats up and cools down. Periodic visual inspections and pressure checks of the pre-charge are recommended as part of routine maintenance.

Usage recommendations

Confirm compatibility of the vessel’s pre-charge pressure with the system filling pressure before installation. Use appropriate fittings and isolation valves to allow safe removal and servicing of the vessel without draining the entire system. Schedule annual checks of the diaphragm and pre-charge pressure to ensure ongoing performance.