Vaillant expansion vessels are designed for use in ecoMAX VUW condensing, ecoTEC VU condensing, home condensing, Guernsey and Jersey only condensing, ecoMAX VU condensing, ecoTEC VUI condensing and VWL heat pump accessory appliances. The expansion vessel is a chamber designed to protect water heating systems from excess pressure. It is filled with air, which acts as a cushion against system pressure spikes.

• Cannot be used for drinking water
• Silver colour
• Rectangular shape