Andrews 150L Expansion Vessel 95607462

The 150L expansion vessel is an Andrews Water Heaters component supplied for use with 1250L hot water cylinders. It is rated at 10 bar and provides the air cushion that absorbs the expansion of water as the cylinder heats, limiting the pressure rise in the system. It is listed across the direct, indirect, Flexistor and solar cylinder ranges.

• The pressure relief valve discharges continuously or repeatedly during heating cycles
• System pressure climbs quickly once the cylinder heats, indicating the vessel is waterlogged
• Little or no pressure buffer remains, suggesting the pre-charge has been lost
• Corrosion, pitting or water weeping is visible on the vessel shell
• System pressure fluctuates sharply during normal operation

• Confirm the cylinder capacity and model against the appliances listed above, as the vessel is specified for 1250L installations
• Check the system pressure rating — 6 bar and 10 bar cylinders both appear in the fitment list, and the vessel rating must suit the installation
• Verify the vessel connection and mounting arrangement match the unit being replaced before removal
• Allow for handling and access, as a 150L vessel requires space to manoeuvre on site