Based on this product's specifications, here are some alternatives and similar models
Expansion Vessel (Open Horizontal) Kaps 25 L for Heating Systems
Summary description:
Open horizontal expansion vessel Kaps 25 L designed for use in central heating (CO) systems. This 25-litre open-type vessel provides volume compensation and pressure stabilization in heating installations. Suitable for horizontal mounting, it helps prevent overpressure and air accumulation in boilers and circulation circuits in residential or light-commercial heating applications.