BESA updates HIU Test Standard
The Building Engineering Services Association (BESA) has announced an important update to its UK Heat Interface Unit (HIU) Test Standard, further strengthening performance benchmarks and supporting the sector’s readiness for incoming heat network regulation.
Version 3.1 of the BESA HIU Test Standard builds on the success of previous editions, which have made a positive contribution to the consumer experience, improving the services of residential heat networks and reducing carbon emission. The V3.1 standard represents another step forward for HIU performance across the sector.
The changes are aligned with BESA’s core mission to improve the performance of residential HIUs and come at a critical time as the industry prepares for the introduction of the Heat Network Technical Assurance Scheme (HNTAS), which is expected to require HIUs to meet the BESA HIU Test Regime or an equivalent standard.
HIUs are a key component in heat networks, directly influencing system efficiency, energy use and the experience of building occupants and consumers. The latest update to the BESA standard introduces new pass/fail criteria for indirect space heating performance, including average temperature and mix down temperature stability.
In addition, updates to pass thresholds and best practice values will drive improvements in product design and specification, helping to ensure better outcomes for consumers and more efficient heat network operation.
The timing of the update reflects the growing importance of heat networks within the UK’s decarbonisation strategy and the need for consistent, reliable performance standards.
BESA is also supporting industry readiness through its dedicated HNTAS training programme, designed to help stakeholders understand and prepare for the new requirements, with further training and guidance set to be rolled out over the summer.
