Heat networks: what installers need to know
Heat networks supply around 3% of the UK's heat today. The government wants that to reach 7% of England's heat demand by 2035, and around a fifth of UK heat by 2050. That growth will not happen without skilled people on the ground, and installers who understand heat networks now will be first in line for the work.
This guide explains what a heat network is, why 2026 is a turning point for the sector, and what it means for heating installers, local authorities and developers.
What is a heat network?
A heat network, sometimes called district heating, delivers heat and hot water from one central source to many buildings or homes. Instead of every flat or office running its own boiler, heat is generated once and piped to each property through insulated pipework.
There are two main types:
- Communal heat networks serve a single building, such as a block of flats with a shared plant room.
- District heat networks serve several buildings across a site, an estate or a whole part of a town or city.
Every heat network has the same four building blocks:
- The energy centre, where heat is produced. Modern networks increasingly use large heat pumps or recover waste heat from sources such as data centres, industry, rivers or the London Underground.
- The distribution pipework, a flow and return circuit of pre-insulated pipes that carries hot water to each building.
- The heat interface unit (HIU) in each property, which takes heat from the network and supplies the radiators and hot water, much like a boiler would.
- Metering and controls, so each customer is billed for the heat they actually use.
The big advantage is scale. One large, efficient low carbon heat source can replace hundreds of individual gas boilers, and the network can switch to cleaner heat sources over its lifetime without changing anything inside the homes it serves.
What is driving the future of heat networks?
2026 has been a significant year for the UK heat network sector, with new regulations, government investment and progress on heat network zoning laying the foundations for future growth.
Three key developments are shaping the future of the industry.
Ofgem now regulates heat networks. Ofgem became the regulator for heat networks across Great Britain on 27 January 2026, marking the start of a new regulatory framework designed to strengthen consumer protections, improve transparency and raise standards across the sector.
Technical standards are on the way. The Heat Network Technical Assurance Scheme (HNTAS) is being developed to introduce mandatory technical standards for the design, construction and operation of heat networks, helping to improve quality, performance and reliability across the sector (Pinsent Masons). Poor design and installation have held the sector back, and the scheme is designed to fix that. Competence will matter more than ever.
Heat network zoning is coming to England. Using powers in the Energy Act 2023, the government will designate zones in towns and cities where a heat network is the lowest cost, low carbon way to heat buildings. Within a zone, certain buildings will be required to connect. The government confirmed its approach in January 2026, alongside the Warm Homes Plan, which sets a target for heat networks to meet 7% of England's heat demand, around 27 TWh, by 2035 (Savills). Councils such as Plymouth and the City of London are already consulting on their zone boundaries.
Investment is following. The Green Heat Network Fund offers around £195 million a year in capital grants for projects.
What it means for installers
The sector needs people, and it needs them soon. The Heat Networks Industry Council estimates that around 35,000 jobs will be required for heat networks to supply a fifth of UK heat by 2050 (HeatNIC). In June 2026, Energy UK warned that a serious shortage of skilled workers could hold back the rollout of heat pumps and heat networks under the Warm Homes Plan (GB News).
For heating and plumbing installers, this is a real commercial opportunity. Much of the work on a heat network sits inside buildings and draws on skills you already have:
- Installing, commissioning and servicing heat interface units in flats and offices
- Connecting existing buildings to a new network, including replacing individual boilers
- Secondary pipework, insulation, flushing and water treatment
- Fault finding on underperforming systems, especially high return temperatures
- Maintenance contracts with operators, housing providers and facilities managers
What changes is the context. Heat networks run at different temperatures from a boiler system, and a badly set HIU can raise costs for every customer on the network. With Ofgem regulation and technical standards now in place, clients will expect installers to understand how the whole network works, not just the unit in front of them.
As zoning brings mandatory connections in towns and cities, demand for this work will rise across whole neighbourhoods. Installers who are trained early will be best placed to win it.
Not just for installers
Heat networks affect everyone involved in planning, building and managing property.
- Local authorities are likely to become zone coordination bodies, responsible for identifying zones, engaging stakeholders and managing connections. Officers in planning, housing, energy and estates will all need a working understanding of how networks operate.
- Developers building within a future zone may be required to connect new schemes to a network, which shapes design decisions from the earliest stage.
- Housing providers and facilities managers responsible for existing communal systems now operate in a regulated market, with clear duties to customers.
For these roles, the priority is not hands-on installation. It is knowing enough to ask the right questions, specify correctly and make sound decisions.
Get trained with GTEC, fully funded
GTEC is an approved provider under the government's Heat Training Grant. That means our heat network course is fully funded for eligible learners.
The course is delivered online, so you can complete it around your work without time away from site. It covers:
- Feasibility and design
- Construction and commissioning
- Operation and maintenance
- Metering and billing
- Governance and procurement capability
Delivery: Online
Cost: Fully funded through the Heat Training Grant (England only, one grant per person)
Places are limited.