This expansion vessel, compatible with various Vaillant Boilers such as the Ecotec Pro 2006-2010 & Ecotec Plus 2005-2010, serves the purpose of safeguarding closed water heating systems from undue pressure buildup. Filled with air, the expansion vessel functions as a buffer against sudden pressure surges. It is a spare part suitable for multiple Baxi Boilers, including the Baxi Solo HE, Duotec HE, Main Eco, Potterton Gold, Heatmax, Promax Combi & Promax HE Store.

It's important to note that this expansion vessel is not intended for use with drinking water. Additionally, it is designed to fit a broad range of Baxi, Main, and Potterton boilers, offering versatility in its application.