The ISH trade fair at Messe Frankfurt, Germany, is one of the most important global events in the water and energy technology sector. This biennial event not only attracts visitors from all over the world, but is also a crucial meeting point for innovators, manufacturers and industry professionals. The relevance of ISH can be measured both by its impressive numbers and by its significant impact on the HVAC (heating, ventilation and air conditioning) and water management industries. Each edition of ISH brings together more than 2,500 exhibitors from over 50 countries and attracts close to 200,000 visitors, making it one of the largest and most influential trade fairs in its field. These numbers not only reflect the scale of the event, but also underline the importance of the trade fair as a launching pad for innovations and trends in the sector. Exhibitors take the opportunity to present their latest technologies and solutions – from more efficient heating and air conditioning systems to advanced technologies for water treatment and management. The importance of ISH also lies in its ability to bring together diverse industry players. Manufacturers, distributors, engineers, designers, researchers and politicians all come together at this event, facilitating an exchange of ideas and knowledge that is vital for technological advancement and the implementation of effective policies in the sector. In addition, ISH is a platform where international business relationships can be established and strengthened, which is essential in a globalised market. Another highlight of ISH is its focus on sustainability and energy efficiency, topics that are of utmost importance in the current context of climate change and resource scarcity. The fair offers an insight into the latest innovations that seek not only to improve the efficiency of existing systems but also to promote the use of renewable energy and environmentally friendly technologies. This not only helps companies comply with stricter environmental regulations, but also enables them to contribute to building a more sustainable future. In short, ISH at Messe Frankfurt is much more than a trade event; it is a catalyst for progress and innovation in the water and energy technology sector. Its impact extends beyond impressive attendance and exhibition numbers, influencing the direction of technological development and industrial policies worldwide. ISH’s continued evolution and success demonstrate its irreplaceable position in the international event calendar of the sector.