Notice

Heat Network Technical Assurance Scheme (HNTAS): technical feedback process

We’re seeking feedback on the contents of the draft HNTAS Code documents, the Heat Network Technical Standard (TS1) and the Metering and Monitoring Standard (MMS).

From:
Department for Energy Security and Net Zero
Published
16 February 2026

Applies to England, Scotland and Wales

Documents

Heat Network Technical Assurance Scheme (HNTAS): technical feedback process - guidance

PDF, 1010 KB, 17 pages

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Heat Network Technical Assurance Scheme (HNTAS): technical feedback process - guidance (accessible webpage)

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HNTAS feedback form template: Code documents for new build heat networks

MS Excel Spreadsheet, 55.2 KB

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HNTAS feedback form template: Code documents for existing heat networks

MS Excel Spreadsheet, 45.4 KB

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HNTAS feedback form template: TS1

MS Excel Spreadsheet, 43.7 KB

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HNTAS feedback form template: MMS

MS Excel Spreadsheet, 36.8 KB

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Heat Network Technical Assurance Scheme (HNTAS): technical feedback process - KPI explanations (draft)

PDF, 2.63 MB, 45 pages

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Details

This process is aimed towards stakeholders with a technical understanding of heat networks. Technical feedback can be submitted until 25 May 2026. The technical feedback process will run in parallel to the Heat Network Technical Standards policy consultation which closes on 15 April.  

Please note: Feedback on policy matters should be submitted through the Heat Network Technical Standards policy consultation which closes on 15 April 2026. The Technical Feedback Process is only seeking comments of a technical nature on the draft Code documents, TS1 and MMS.

We are seeking feedback on the following draft documents: 

Draft versions of a number of technical Code documents which make up the Heat Network Technical Assurance Scheme (HNTAS) have been issued, as well as the Heat Network Technical Standard (TS1) and the Heat Network Metering and Monitoring Standard (MMS). 

We are running a structured feedback process to allow those with a technical understanding of heat networks to respond to the technical contents of these documents.  We expect this to be of particular interest to: 

  • heat network assessors 
  • heat network developers 
  • heat network designers 
  • heat network operators 

The outcomes of this feedback process will be incorporated into the change management processes for HNTAS. 

How to respond 

In order to aid the process, we have developed a guidance document that sets out more information on the technical feedback process, including the guidelines on providing feedback and how this feedback will be used in further HNTAS development.  

All comments should be submitted via the templates provided, to give feedback: 

Feedback can be provided by sending populated versions of these feedback forms to HNTAS.TechnicalFeedback@energysecurity.gov.uk by 25 May 2026. 

Draft guidance - KPI explanations 

Guidance has been developed in draft format to aid in understanding and interpreting the meaning, purpose, and rationale for each key performance indicator (KPI) used within HNTAS to measure and assess heat network performance and reliability.

Next steps 

We will be accepting feedback forms until 25 May 2026. We will then review the responses and action any feedback following the process set out in the guidance document.  

We will publish a summary of the outputs and learnings from the technical feedback process once the feedback has been reviewed, actioned, and implemented. 

Final versions of the Code and Standards documents which incorporate the feedback implemented from the technical feedback process will be published prior to scheme launch.

Updates to this page

Published 16 February 2026

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