The EU's revised Energy Performance of Buildings Directive (EPBD) mandates hydronic balancing in new and renovated buildings to improve energy efficiency and comfort. This means new heating/cooling systems must be balanced from the start, and existing systems must be balanced when the heat or cooling generator is replaced. The legislation also requires buildings over a certain size to have Building Automation and Control Systems (BACS) to optimize performance, which is increasingly relevant for dynamic hydronic balancing solutions.