HEAT NETWORKS


Navigating the pathway to 5G heat networks


New technologies and formalised regulations are pushing fifth- generation heat networks towards the mainstream. Jarrad Bedford explains how a decentralised heat pump system can save on installation costs and deliver on energy efficiency.


Jarrad Bedford insite-energy.co.uk


Head of solutions at Insite Energy


H


eat networks have long been recognised as an efficient way to deliver heating and hot water at scale, particularly


in urban environments. However, the sector is now undergoing rapid transformation shaped by tightening regulation, changing economics and advances in low-carbon technology. Traditionally fuelled by centralised gas boilers or combined heat and power (CHP) systems, heat networks are increasingly adopting electrified, renewable heat sources, with heat pumps playing a central role. Several times more efficient than combustion systems, heat pumps support decarbonisation targets, including the Future Homes Standard, which will ban gas boilers in new homes from 2027. Paired with heat networks, they also


help developers meet stricter planning requirements, including those set out in the London Plan.


Flexible solutions One of the greatest strengths of heat networks is their flexibility. They’re fundamentally heat-source agnostic, allowing technologies to be upgraded and replaced as needs and viabilities change.


Heat pumps fit naturally into this model. Whether drawing energy from the air, ground, watercourses or waste heat sources, they can be integrated into both new and existing networks. Air source heat pumps (ASHPs) are


proving particularly attractive due to their versatility and ease of installation. They can be sited on rooftops or walls, making them suitable for retrofitting projects and urban locations where ground space is limited. A notable example can be found in


Barnet, North London, where a heat network powered by twelve 42kW


30


ASHPs serves more than 230 homes. Operating around three times more efficiently than an equivalent gas- fired network, it demonstrates the significant performance gains that heat pumps can offer.


The retrofi t challenge Achieving these efficiencies depends heavily on system design, however. Heat pumps perform best at lower operating temperatures, meaning network configuration, controls and operational management are all critical in maximising performance. This can make adding heat pumps into existing heat networks challenging. Many legacy systems were designed around gas boilers operating at higher flow temperatures. Transitioning them to operate at cooler levels is rarely a straightforward equipment swap. It generally requires costly and disruptive upgrades to pipework, insulation and radiators alongside modifications to energy centres and control systems. Large refurbishment programmes can take months to complete, meaning temporary heating solutions may be needed. Energy prices add further


complexity. Although heat pumps are more efficient than boilers, electricity remains significantly more expensive than gas on a per-kWh basis. This leads many building owners to favour replacing ageing boilers with newer gas-fired equipment, at least until market evolution and government policy tip the balance towards renewables.


Next generation There is an exciting new development within the sector that points towards a solution to these issues. That is the emergence of fifth-generation heat networks, often referred to as ambient loop systems. Unlike gas-powered systems that distribute hot water from a central energy centre, ambient loops circulate water at much lower temperatures, typically 10-30°C. Individual heat pumps located within each dwelling


Air source heat pumps can provide heating and cooling for multiple properties


then heat it locally to meet domestic heating and hot water requirements. This approach fundamentally changes how heat networks operate. Rather than relying on centralised heat generation, energy production becomes distributed and demand-led. The benefits are considerable.


Network heat losses are significantly reduced and the need for heavily insulated pipework is minimised. In retrofit projects, existing risers and pipe infrastructure can often be retained, decreasing disruption and installation costs. Meanwhile, overall system efficiency improves. Ambient loops are also inherently


scalable. Additional buildings can be connected without the need for substantial expansion of central heat generation capacity. This makes them particularly attractive for phased developments and long-term urban regeneration projects.


Driving change The technology required to deliver low- carbon heat networks already exists. The pace of deployment will therefore increasingly be determined by policy, investment and workforce capability. Government initiatives such as heat network zoning should accelerate adoption by requiring most developments within designated areas to connect to district heating infrastructure. Meanwhile, the forthcoming Heat Network Technical


Assurance Scheme (HNTAS) will introduce rigorous standards covering design, installation, operation and maintenance. It aims to improve system efficiency and strengthen protections for consumers, thereby removing barriers to market growth. However, alongside regulatory


developments, the industry faces a growing skills challenge. Designing, commissioning and maintaining low- temperature heat networks powered by heat pumps requires specialist expertise that differs significantly from traditional boiler-based systems. While training programmes and


apprenticeships are beginning to address this, demand for skilled professionals is increasing rapidly. Unless more is done to fast-track specialist engineers into the workplace, energy managers will face problems sourcing appropriate service providers, potentially hampering decarbonisation progress. This is a short-term issue, however, not a permanent roadblock. It’s clear heat networks will play an increasingly important role in the UK’s journey to net zero, and heat pumps will be central to their evolution. As policy frameworks mature, energy markets adapt and technologies such as ambient loops gain traction, heat pump-powered heat networks will become a practical, scalable solution for decarbonising our towns and cities. ■


EIBI | JULY � AUGUST 2026


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