Technical standards
HNTAS, the technical assurance scheme
HNTAS will set minimum technical standards for heat networks and check them at set points in a network's life. It is planned for 2027 and has not started.
Status
Where HNTAS stands
| Item | Position | Status |
|---|---|---|
| Heat Network Technical Assurance Scheme (HNTAS) | Planned launch in 2027, phased inThe scheme will be run by a Code Manager, initially the Department for Energy Security and Net Zero, not by Ofgem. The consultation on technical standards closed on 15 April 2026 and no government response had been published at our last check.2027 · Heat Network Technical Assurance Scheme (GOV.UK, updated Feb 2026) | Pending |
| Who runs HNTAS | A Code Manager, initially the Department for Energy Security and Net Zero, which may appoint a scheme operatorHeat network technical standards consultation (GOV.UK, Jan 2026) | Proposed |
| Networks covered by HNTAS | Proposed: new networks serving 6 or more properties or 225kW, and existing networks serving 11 or more properties or 450kWNew networks would pass assessment gateways at design, construction and operation, with a check two years into operation. Existing networks get longer transition periods.Heat network technical standards consultation (GOV.UK, Jan 2026) | Proposed |
Context
How it relates to zoning
HNTAS applies to heat networks whether or not they are in a zone. Networks built in designated zones would also have to meet it, which is one reason the technical standards and the zoning regulations are being developed side by side. The scope figures above are proposals from the consultation and may change in the government’s response.