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What we know about HNTAS ahead of its planned 2027 launch
GOV.UK has updated its page on the Heat Network Technical Assurance Scheme. Here is what HNTAS is, where it fits alongside Ofgem regulation and what operators can do now.
The government updated its page on the Heat Network Technical Assurance Scheme, or HNTAS, on 16 February 2026. The scheme is the next big piece of heat network regulation after Ofgem's arrival last month, so it's worth setting out what is known.
What HNTAS is for
Ofgem has regulated heat networks since 27 January 2026[source]. Much of that regulation is about the relationship between operators and their customers. HNTAS tackles a different problem. As its name says, it is about technical assurance, meaning checks that heat networks are designed, built and operated to minimum technical standards.
That matters because many of the problems heat network customers complain about, such as high bills and unreliable heat, are often traced back to poor design, installation or maintenance. Better consumer rules alone can't fix a badly built network.
What isn't settled
The scheme is planned rather than live, and it is being phased in. That means the launch date and the date it applies to any particular network may well be different. The GOV.UK page is the place to watch for the detail on which networks come first, how assessment will work and what it will cost. We'll update this site as that detail firms up.
How it fits with the registration deadline
Operators have a more immediate job. Existing networks must register with Ofgem by 26 January 2027[source]. Registration comes first, and HNTAS follows.
What it means for building owners
If you run a communal or district heating system, including as a landlord, use the time before HNTAS reaches you to get your technical records in order. That means as-built drawings, operating and maintenance manuals, commissioning records and any performance data you hold. If records are missing or the system is old, a condition survey now could save trouble later, and it will help with capital planning whatever HNTAS ends up requiring. Our directory lists specialists in HNTAS readiness, and our guide to Ofgem regulation and HNTAS sets out a timeline to 2027.