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HEATING, VENTILATION & SERVICES
This lifecycle approach promotes accountability and continuous improvement. For architects, it highlights the importance of designing spaces that allow adequate access for metering, testing, and maintenance, factors that directly contribute to long-term effi ciency.
Technical priorities Key to HNTAS compliance will be the management of heat losses and fl ow temperatures. Optimised pipe sizing, effective insulation, and low temperature operation will be fundamental. Architects can support this by: • Providing well-planned plant rooms and service risers to accommodate insulation thicknesses.
A successful design process will now increasingly depend on the integration of thermal, mechanical and architectural expertise
• Designing layouts that minimise pipe runs between energy centres and dwellings.
• Ensuring access for inspection and retrofi t where required.
These design considerations reduce operational costs and carbon emissions, aligning building performance with client sustainability objectives.
Component performance & assurance
Heat Interface Units (HIUs) play a pivotal role in the overall effi ciency and comfort levels of a network. Their ability to control heat transfer between the primary system and individual homes directly affects compliance. Under HNTAS, specifying components that have been independently tested and verifi ed, such as HIUs that meet recognised performance benchmarks, will help designers and developers meet the scheme’s technical criteria. Independent validation provides the objective data needed to demonstrate system reliability and consumer protection, without relying on proprietary claims.
Bridging the heat network knowledge gap For many professionals, HNTAS represents a learning curve. The scheme builds on existing best-practice frameworks such as CIBSE CP1 (2020), but it also introduces new compliance and reporting mechanisms. A coordinated, informed approach between disciplines will therefore be essential. The Building Engineering Services Association (BESA) has been
WWW.ARCHITECTSDATAFILE.CO.UK
appointed to develop and deliver HNTAS training courses.
Architects can prepare by enrolling in
the BESA Training, engaging in technical CPD opportunities, collaborating with heat-network specialists, and ensuring their teams understand how layout and building fabric decisions infl uence network performance. A successful design process will now increasingly depend on the integration of thermal, mechanical, and architectural expertise.
HNTAS as a catalyst for better design
For forward looking practices, HNTAS should be seen as an opportunity rather than a constraint. The scheme supports broader design goals, where reducing operational carbon, improving occupant wellbeing, and ensuring long term building value are prioritised. By embedding effi ciency principles early, architects can help deliver developments that are not only compliant but also resilient and adaptable to future energy requirements. In mixed-use or regeneration projects, for instance, an effi cient heat network design can underpin the sustainability of an entire masterplan, supporting shared energy resources and reducing peak demand pressures.
Conclusion The Heat Network Technical Assurance Scheme marks a pivotal moment for the UK’s approach to heat decarbonisation. For architects, it signals a more active role in ensuring the success of low carbon energy systems.
DESNZ is currently working on the technical documentation, and scheme pilots started in summer 2025, with formal implementation anticipated in 2026. Once the framework is in place, Ofgem will assume regulatory oversight, monitoring compliance and ensuring accountability across the sector. By engaging early, coordinating across disciplines, and prioritising performance in both design and delivery, architects can help ensure that future heat networks meet regulatory standards, support national carbon goals, and deliver lasting comfort and value for the people who live and work within them.
Josh Collins is heat networks manager at Altecnic Ltd
ADF JANUARY 2026
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