DISTRICT HEATING/HEAT NETWORKS
Heat network standards should build confidence, not create barriers
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The UK is expanding heat networks to support its Net Zero ambitions, which means getting regulation right has never been more important. But can the sector raise standards without slowing innovation? Charlie Hilton, key account manager for energy and district heating at Carrier Commercial HVAC UK & Ireland, explores why the best regulatory frameworks are those that protect consumers while giving the industry the confidence and flexibility to evolve, invest and grow
he UK has ambitious plans for heat networks. Government estimates suggest they could provide around 20% of the nation’s heat demand by 2050, helping decarbonise our towns and cities while making better use of renewable and recovered heat sources. Currently, district heating supplies approximately 2% to 3% of UK heat, serving around 500,000 to 700,000 customers. In contrast, mature Nordic markets connect 13 to 14 million people – around half their population – with penetration reaching ~65% in Denmark and ~55% in Sweden. That contrast illustrates the scale of the UK opportunity. Recent research by the Association for Decentralised Energy (ADE) shows that scaling up UK district heating alongside large thermal storage could bring massive benefits over individual heat pumps, with energy system cost savings of £3.5bn a year and a cumulative net benefit of £86.5bn by 2050. Delivering that ambition, however, depends on more than deploying low-carbon technologies. It requires confidence from investors, developers, local authorities and, most importantly, consumers who rely on these networks for affordable, secure heat. That’s why the introduction of the Heat Network Technical Assurance Scheme (HNTAS) is such an important milestone for the sector. Yes, it will introduce new technical standards, but hopefully it will build confidence in heat networks at a time when the industry needs to accelerate.
Raising standards without restricting innovation
The sector has developed rapidly over the past decade, driven by innovation and a shared commitment to decarbonisation. While there are many excellent examples of well-designed schemes, projects that have fallen short with inconsistent performance, high costs, or poor service have affected public trust. Evidence from mature international markets shows that scaling relies less on resource availability and more on governance frameworks – including clear institutional roles, predictable tariff frameworks, risk allocation mechanisms, and integrated heat planning. UK policy is adapting these lessons, transitioning from fragmented, project-based deployment toward an integrated market framework. Under regulations entering into force in 2026, Ofgem assumes responsibilities as heat regulator overseeing authorisation, consumer protection, billing, complaint handling and fair pricing, while DESNZ’s HNTAS framework establishes common expectations for design, construction, commissioning, operation, and maintenance. As a manufacturer working with consultants, developers, contractors and energy
companies, we’ve seen the conversation evolve. Where discussions once centred largely on decarbonisation targets and technology selection, we now find more focus on long- term performance, operational efficiency and customer outcomes. That is a positive shift; successful heat networks have always depended on more than selecting equipment. The challenge now is to ensure that regulation builds confidence without slowing progress. Good regulation should raise standards without becoming overly prescriptive or adding unnecessary complexity. Most importantly, it should enable investment and innovation, rather than becoming another barrier to delivering low-carbon heat.
Why flexibility matters
In our experience, the best-performing heat networks are shaped long before the first customer is connected. Choosing the right heat source is fundamental, but how technologies are integrated within the energy centre, the control strategy, commissioning and consideration for long-term operation all influence lifetime network performance. Large-scale heat pumps are a prime example: whether harnessing ambient air, water, geothermal energy or recovered waste heat, achieving expected efficiency depends on how they are integrated within the wider system; from controls and thermal storage through to operating temperatures and plant strategy. This is why flexibility matters. No two heat network projects are the same. Heat sources, building types, customer demands and local infrastructure vary considerably. Project teams need flexibility to combine heat sources and system configurations to achieve the best outcome. We need to see that same flexibility reflected in regulation. This aligns with Government plans for heat network zoning, which identifies areas where district heating is the most effective low-carbon solution. Crucially, zoning provides operators with a guaranteed customer base, mitigating delivery risk and unlocking private investment. HNTAS should establish a consistent quality benchmark without prescribing how every project must be delivered. Confidence and flexibility are not competing objectives – done well, they reinforce one another.
Collaboration delivers better- performing networks Successful heat networks depend on
20 BUILDING SERVICES & ENVIRONMENTAL ENGINEER SEPTEMBER 2026
collaboration from the earliest stages of project development. Consultants, developers, contractors, manufacturers and operators all bring expertise, but the strongest outcomes are achieved when conversations begin early and continue throughout the project lifecycle. At Carrier, our role has evolved from supplying individual products to supporting integrated heating solutions. Working alongside consultants and developers during early design can help optimise the complete energy centre, identify potential challenges before construction begins, and support decisions based on operational performance, resilience and whole-life value rather than capital cost alone. Good commissioning is another clear example. Even the best-designed energy centre cannot achieve its potential if systems are not commissioned, balanced and optimised correctly. Sophisticated equipment can only deliver expected performance when controls are fully integrated to reflect actual network operation. HNTAS offers greater consistency in how these principles are applied across the industry. Naturally, new regulatory frameworks raise questions, and recent industry discussions around implementation and proportionality are healthy. Heat networks range from small communal developments to large city-scale infrastructure, and regulation must recognise that diversity. I believe technical assurance has the potential to become far more than a regulatory requirement; it will become an enabler of future investment.
Technical assurance as an enabler of investment
For manufacturers, this represents both an opportunity and a responsibility. Our role supports projects throughout their lifecycle – helping customers understand how heat sources can be applied, sharing lessons from completed schemes, and delivering efficient networks that perform over decades. Ultimately, trust will determine whether heat networks achieve their full potential. Consumers need confidence in reliable, affordable heating; investors need long-term performance assurance; developers need clear, achievable rules; and manufacturers need freedom to innovate. None of those objectives is in conflict. If HNTAS and Ofgem regulation provide that confidence while maintaining flexibility, they could attract investment, accelerate deployment, and help deliver the UK’s net zero ambitions.
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