Altecnic SATK32107 HIU passes more 'Best Practice' criteria than any other unit in UK BESA Testing

Altecnic Ltd, the UK’s leading supplier of hydronic solutions and part of the Caleffi Group, is proud to announce that its SATK32107 Heat Interface Unit (HIU) has delivered industry-leading results in the latest BESA UK HIU Test Regime, passing more individual ‘best practice’ criteria than any other HIU currently tested in the UK.

Best Practice Achievements

The BESA test is recognised as the benchmark for assessing HIU performance in the UK, independently evaluating efficiency, reliability, and network suitability. In its latest format the test clearly highlights which modules have been completed and how each unit performs against both baseline and best practice criteria. Altecnic’s SATK32107 achieved passed all four indirect modules and recorded 8 best practice outcomes, the highest to date among all tested HIUs in the UK market.

These outcomes demonstrate the unit’s performance under real-world conditions and its alignment with the CIBSE CP1 (2020) and HNTAS standards. The results confirm that the SATK32107 not only meets today’s expectations but is futureproofed for evolving UK performance benchmarks.

Proven Performance Across Test Modules

The SATK32107 excelled in both high and low temperature applications.

·      Modules 1 & 7 (High Temperature): Demonstrated excellent space heating and DHW performance with VWARTs as low as 27°C and rapid hot water response times.

·      Modules 2 & 8 (Low Temperature): Proven compatibility with low-temperature systems and heat pump-ready networks, achieving VWARTs down to 30°C, placing it among the most efficient HIUs on the market.

This outstanding performance gives specifiers, developers, and contractors clear, independently verified data to support confident system design, product selection, and long-term planning.

Driving Decarbonisation

As the UK heat network landscape transitions toward low-carbon energy and electrified heating, the SATK32107 stands out as a future-ready solution. Its proven ability to operate efficiently at low temperatures makes it ideal for integration with heat pumps and renewable heat sources, helping to meet both regulatory standards and climate goals.

By reducing return temperatures and optimising energy use, the SATK32107 plays a vital role in lowering heat loss, enhancing network efficiency, and supporting the UK's wider net zero decarbonisation strategy. For developers and local authorities, this means a reliable, scalable, and sustainable HIU that’s ready for the future of heat.

Gary Perry, Managing Director at Altecnic, commented, “This result reflects our long-term investment in quality, standards, and transparent benchmarking – principles that are embedded in everything we do as part of the Caleffi Group. Our parent company brings decades of Italian engineering expertise and a focus on innovation, which has been instrumental in the development of this high-performance HIU. As the industry shifts toward lower temperature and heat pump-ready networks, this is the kind of independently verified performance the market needs to provide reliable, efficient and future-proofed solutions for UK heat networks.”

Josh Collins, Heat Networks Manager at Altecnic, added, “We support the BESA test regime because it brings clarity and accountability to HIU performance. To achieve 8 best practice results, and more than any other unit on test, is a testament to the engineering and quality behind the SATK32107. It's a powerful validation for specifiers and developers who want to futureproof their networks and ensure customer satisfaction.”

Find out more about the SATK32107 HIU at: https://www.altecnic.co.uk/satk32-indirect-with-network-protection-and-integral-room-controller