Altecnic Stainless Steel Expansion Vessel SSV12C

The Altecnic 12 litre Stainless Steel Expansion Vessel is a sealed-system component that absorbs the increase in water volume as the system heats, limiting pressure rise across the circuit. It is part of the Altecnic expansion vessel range and is intended for boiler and sealed heating applications. The vessel body is manufactured in stainless steel.

• System pressure climbs sharply and stays high once the boiler is up to temperature.
• The pressure relief valve discharges water during normal heating cycles.
• The vessel feels heavy or full of water when the system is cold, indicating a failed internal diaphragm.
• Pressure swings widely between hot and cold states, or the boiler locks out on low pressure shortly after filling.
• Water is present at the vessel's air charging valve when the cap is removed.

• Confirm the required vessel capacity for the system volume and the specification of the existing vessel.
• Check the connection size and thread on the existing vessel so the replacement matches the system pipework or bracket.
• Verify the pre-charge pressure setting required for the installation before fitting.
• Check the available space and mounting position, as the replacement must sit within the existing clearance.