Downloads & Guidance

NEW EDITION NOW AVAILABLE

 The updated Version 3.1 of the BESA Technical Standard for UK HIU Test Regime is finally here and available to download for free. This edition will replace the Version 3 of the standard 

What's New?

Updates on revised pass thresholds and best‑practice values changes aim to support the mission of improving the performance of residential HIUs across the UK.

New pass/fail criteria have been added for:

• Indirect space heating average temperature
• Indirect space heating mix‑down temperature stability

A detailed changelog will be included to help users understand all adjustments 

Also available to download are the individual BESA HIU Test Modules from 1 to 10. 

Here are a number of useful guidance and documents to assist with the Technical Standard for UK HIU Test Regime:

• HIU Clarification Document 
• HIU Declaration of Change Form
• Product Identification - Labelling
• Complaints Procedure 
• MEHNA Engineering Change Process
• Technical Query Procedure
•  Guidance for Interpreting Results for Modules 1, 2, 7, & 8
•  Guidance for Interpreting Results Summary 

Complaints Procedure

Technical & Change Notes

Download the latest technical notes, change notes and registers below