As the UK accelerates its transition to low carbon heating, Heat Interface Units (HIUs) are under sharper scrutiny than ever. The updated BESA HIU Test Regime (2023) is transforming how performance is measured by shifting the industry from opaque claims to transparent, independently verified data.

Understanding the new BESA test is essential for anyone designing, specifying or operating heat networks. It provides the benchmark for efficiency, compliance and consumer protection, and will soon underpin Ofgem’s Heat Network Technical Assurance Scheme (HNTAS).

This webinar will give attendees knowledge on:

How the BESA HIU Test Regime works and what changed in the 2023 update.

Key performance criteria, including pass/fail thresholds, best practice benchmarks, and VWART (Volume-Weighted Average Return Temperature).

Why the test is central to CIBSE CP1 compliance and future Ofgem regulation.

How BESA testing supports the design of low-temperature, heat pump-ready networks.

A real case study: Altecnic’s SATK32107 HIU, and how it achieved compliance and best practice scores under the new regime.

Josh Collins - Heat Network Manager at Altecnic

Understanding the New BESA Test: What it Means for Future Heat Networks