Expansion Vessel for Central Heating No name DART.2.CO24L, 24 L, 6 bar

Expansion vessel for central heating systems, model DART.2.CO24L with 24 L capacity and rated for a maximum working pressure of 6 bar. This closed-type diaphragm vessel is intended to absorb the thermal expansion of water in hot-water heating circuits, helping to stabilise system pressure and reduce stress on boilers, radiators and piping. The compact cylindrical tank is suitable for installation in residential and light commercial heating systems where a 24-litre expansion reserve is required.

Advantages

The vessel provides a stable pre-charged gas cushion separated from the heating water by an internal elastomer diaphragm, which reduces the need for frequent system top-ups and helps prevent water hammer and pressure cycling. Constructed to operate up to 6 bar, it supports reliable pressure management while fitting in confined plantroom spaces. Corrosion-resistant internal coatings and a welded steel body ensure mechanical strength and long service life under normal operating conditions.

Suitable for

• Domestic central heating systems with closed-loop water circuits
• Small commercial heating installations
• Replacement of existing 24 L expansion vessels
• Systems requiring a maximum working pressure up to 6 bar

Key specifications

• Nominal volume: 24 litres
• Maximum working pressure: 6 bar
• Type: closed diaphragm expansion vessel
• Application: central heating systems (hot-water circuits)
• Mounting: horizontal or vertical installation depending on system layout
• Materials: steel body with elastomer diaphragm and protective internal coating

How to use

Install the expansion vessel on the return or feed line of the heating circuit in a location accessible for inspection and maintenance, following local regulations and manufacturer installation practices. Pre-charge the gas side to the recommended pressure for the system (typically matching the static fill pressure), and isolate and drain the circuit when performing connection. Secure all fittings, vent trapped air from the system, then restore normal operation and check for leaks and correct pressure behaviour during heat-up cycles.

Usage recommendations

Check the pre-charge pressure periodically and inspect the diaphragm for signs of failure; replace the vessel if persistent pressure loss or waterlogging occurs. Use corrosion-inhibited water and a properly sized safety/relief valve in the system to maintain safe operation. For final selection and installation, verify compatibility with system volume and operating pressures.