The questions consumers should ask before connecting – listen to episode 8, Tomorrow’s Energy

Unlike homes with their own gas boilers or electric heaters, heat network customers receive heat generated centrally and delivered to their homes or buildings through insulated pipes. Networks can serve a single building, such as a block of flats, or extend across an entire neighbourhood or city.

Tom says: “Heat networks are a different way of providing heat for homes and buildings. Heat networks tend to be where you make heat somewhere other than the building at a much larger scale and then supply that heat to your home or building through insulated pipes.”

He says the approach can offer several advantages. “Some advantages are that it can be lower cost, easier to maintain and have lower carbon emissions.”

One important opportunity is using waste heat from sources such as data centres. Rather than allowing this heat to go unused, a network can capture it and supply it to nearby buildings, potentially providing a lower cost, lower carbon heat source.

Thermal storage can also help networks operate more efficiently. Naughton compares a large thermal store to a battery, allowing heat to be produced when it is cheaper or more convenient and stored until demand increases.

Tom says: “It’s a way of taking energy when it’s not needed and then giving out energy when it is needed.”

For example, heat could be generated overnight and stored for use during the morning, when households need hot water. Heat pumps could also run when electricity prices are lower, reducing the cost of producing heat.

Heat networks do not automatically deliver lower bills or better performance. Poor design, inadequate commissioning and ineffective maintenance can all affect efficiency and increase costs.

Tom says the most common problems are not necessarily equipment failures. Instead, they often stem from how systems are designed, set up and operated.

“It’s quite a complex system and lots of things can go wrong. They tend not to be equipment failures. It’s usually around design, commissioning, maintenance and operation.”

Problems can include oversized heat pumps and pipes, equipment that has not been commissioned properly and temperatures set too high. Once a building is occupied, ongoing maintenance - including managing water quality across the system -becomes critical.

Design and construction decisions can also have long-term consequences. As Tom explains: “A bad design is difficult and expensive to fix later.”

However, improvements are still possible after a network becomes operational. Small adjustments to settings and system management can make a significant difference, highlighting the importance of specialist expertise and continued monitoring.

For households considering connecting, this means asking not only how a network has been designed, but also how its performance is measured, maintained and improved over time.

In our podcast we discussed how understanding the tariff is one of the most important steps before signing a heat network contract.

The main costs include producing and distributing heat, administration, maintenance and equipment replacement. Some maintenance and replacement costs may be recovered separately through service charges.

Heat networks may be more competitive where they use low-cost heat sources, benefit from economies of scale or purchase energy at favourable prices. But the savings depend on the efficiency of the network and how well its operator controls costs and heat losses.

Tom stresses that consumers should ask direct questions about pricing before committing.

“Number one is cost. Ask what the heat tariff is, how many pence per kilowatt hour you’ll pay, how many pence per day, how the tariff is calculated, when it was last updated, and how often it’s reviewed.”

These questions can help households understand both their likely bills and how transparently the network is managed.

Before signing, consumers should establish:

• The unit rate: how much will each kilowatt-hour of heat cost?
• The standing charge: is there a daily charge, even when little or no heat is used?
• Tariff changes: how is the price calculated, when was it last reviewed and how often can it change?
• Additional costs: are maintenance, repairs and equipment replacement included, or charged separately?
• Network efficiency: how are heat losses monitored, and what action is taken to reduce them?

Households should also ask how the operator tracks performance and what evidence it can provide that the system is operating efficiently.

The tariff is only part of the picture. Consumers also need to understand the quality of service they can expect, who is responsible for the equipment and what happens when things go wrong.

In Tomorrow’s Energy, Tom suggests that even the temperature in shared spaces can provide useful clues about a network’s performance.

“I’d also want to know what the temperature is like in communal corridors,” he says. “Overheated corridors can indicate poor performance and significant heat losses.”

Prospective customers should also establish who to contact if they experience problems with their heating, hot water or heat interface unit - the equipment that transfers heat from the network into their home.

Key questions to ask include:

• Who operates the network, and who is responsible for maintenance and repairs?
• What response times can residents expect if heating or hot water fails?
• How are faults reported, and what is the formal complaints process?
• How are residents informed about outages, maintenance and tariff changes?
• What consumer protections apply, and where can residents seek independent support?
• Can the operator provide information about efficiency, reliability and service performance?

Unlike households that can choose between competing energy suppliers for their electricity or gas, heat network customers often cannot switch their heat provider. In some cases, they may not be able to disconnect and install an alternative heating system.

Tom recognises that this is a legitimate concern.

“A heat network is effectively a monopoly. In some cases, residents may not even be able to disconnect and install their own system.”

He points to the work of Heat Trust and the introduction of consumer protection regulations as important steps towards improving the position of residents.

With Ofgem regulating heat networks, consumers should expect clearer billing, stronger complaint-handling arrangements and better reporting of network performance. Operators should also take greater responsibility for identifying problems and resolving them proactively.

Nevertheless, consumers should check which protections apply to their network and understand how to escalate a complaint if their supplier fails to resolve an issue.

For Tom, the sector’s priority should be to judge heat networks by the experience they deliver to residents, rather than focusing solely on technical specifications or construction standards.

“I’d like the sector to focus much more on outcomes for consumers,” he says.

He adds: “Residents don’t care how big the pumps are or what the policy targets are. They care whether their home is warm, their hot water arrives quickly and their costs are reasonable. Some also care about carbon emissions.”

The point is central to the future of heat networks. Their potential to support decarbonisation depends not just on the technology itself, but on whether it provides a reliable, affordable service that people can trust.

Salix’s podcasts explore the challenges and opportunities of decarbonisation, sharing insights from the people, organisations and communities working to turn net zero ambitions into action.

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