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Heat Network Technical Assurance Scheme (HNTAS): draft Code documents

Draft new build and existing heat network technical specifications and assessment procedures to help heat networks demonstrate compliance with the Heat Network Technical Assurance Scheme (HNTAS).

Updates to this page

From:
Department for Energy Security and Net Zero
Published:
15 December 2025
Last updated:
21 January 2026
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  1. Added Overviews of technical specifications and assessment procedures for existing heat networks.

  2. Added draft technical documentation for existing heat networks.

  3. First published.

New build heat networks: draft technical specifications

New build heat networks: draft assessment procedures

Existing heat networks: draft technical specifications

Existing heat networks: draft assessment procedures

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