Expansion vessel VAREM R1002828, 2 L, diaphragm pressure accumulator for heating and domestic systems

VAREM expansion vessel R1002828 is a 2-litre diaphragm pressure accumulator engineered for closed heating and domestic water systems. The compact steel-bodied vessel with internal elastomer diaphragm separates air and water to stabilise pressure, absorb thermal expansion and reduce water hammer. Its small footprint makes it suitable for installation near small boilers, hot-water circuits and domestic circulation loops where maintaining steady system pressure and protecting pumps and piping are important.

Advantages

The diaphragm design prevents air dissolution into the system, ensuring consistent pressure response and longer service life for circulating pumps and valves. With a 2-litre capacity it provides effective pressure dampening in small-volume installations while occupying minimal space. The durable construction resists corrosion and the pre-charged gas side simplifies commissioning and reduces maintenance frequency compared with open or non-diaphragm solutions.

Suitable for

• Domestic and small residential central heating systems
• Small hot-water and sanitary circulation loops
• Boiler feed and closed-loop circulation protection
• Light commercial installations with low volumetric requirements

Key specifications

• Nominal volume: 2 litres
• Diaphragm (membrane) type separation between gas and liquid
• Intended for closed heating and domestic water systems
• Compact steel body suitable for tight installation spaces
• Pre-charged gas side for immediate operation after installation

How to use

Install the expansion vessel on the return pipe or at a location recommended by the system designer, ensuring the vessel is oriented and supported according to local regulations. Verify the pre-charge pressure on the gas side and adjust to match the static system pressure before connecting to the hydraulic circuit. After connection, fill the system and bleed air from the circuit; check for correct operating pressure and leak tightness. Periodically inspect the external condition and measure pre-charge pressure during routine maintenance to confirm continued performance.

Usage recommendations

Match the vessel pre-charge to the static pressure of the heating system and follow manufacturer or local plumbing standards for mounting and safety. For best results in small-volume systems, combine the 2-litre vessel with proper air separation and regular system flushing to reduce the likelihood of air accumulation and corrosion.