Expansion Vessel (Open Horizontal) Kaps 25 L for Heating Systems

Open horizontal expansion vessel Kaps 25 L for heating systems is a 25-litre open-type tank designed to provide volume compensation and pressure stabilization in central heating (CO) installations. Intended for horizontal mounting, the vessel integrates into boiler rooms and circulation circuits to help manage thermal expansion of water and reduce the risk of overpressure. The construction is suitable for residential and light-commercial heating systems where an open expansion vessel is required.

Advantages

The Kaps 25 L open horizontal expansion vessel offers reliable simple operation and straightforward installation thanks to its horizontal orientation and accessible connections. Its 25-litre capacity provides measurable buffer volume for small to medium heating circuits, helping to stabilize system pressure during temperature changes. The open design allows air to escape and avoids closed-system sealing requirements, simplifying maintenance and inspection.

Suitable for

• Residential central heating systems
• Light-commercial heating installations
• Boiler rooms with horizontal mounting space
• Systems requiring open expansion vessels for pressure relief and air separation

Key specifications

• Type: open expansion vessel, horizontal orientation
• Nominal volume: 25 litres
• Application: central heating (CO) systems
• Mounting position: horizontal
• Function: volume compensation and pressure stabilization during thermal expansion

How to use

Mount the vessel in a horizontal position in the boiler room or circuit location specified by system design. Connect the vessel to the heating circuit using appropriate piping and fittings, ensuring correct alignment and secure joints to prevent leaks. Fill and vent the heating system following standard commissioning procedures for open expansion systems, monitoring water level and free air space in the vessel. Perform regular visual inspections for corrosion, deposits or leakage and ensure the vessel remains accessible for maintenance.

Usage recommendations

Install the expansion vessel where it can be inspected and drained if necessary. Use corrosion-resistant connections and follow local standards for open expansion systems. Regularly check system water quality and maintain the boiler room to prevent contamination or obstruction of the vessel. For system sizing beyond typical residential loads, verify that 25 litres of buffer volume is adequate or consult a heating professional to select an appropriately sized expansion vessel.