Based on this product's specifications, here are some alternatives and similar models
Expansion Vessel FERRO K5UNI18W — universal wall-mounted, 18 L capacity
Summary description:
FERRO K5UNI18W is a universal wall-mounted expansion vessel with an 18-litre capacity designed for closed heating and hot water systems. It compensates pressure changes caused by thermal expansion, protects piping and appliances, and helps maintain system stability. Suitable for domestic and light commercial installations where a compact, wall-mounted expansion vessel is required.