Heat Network Suppliers: Who Supplies Homes on Communal Heating

A heat network supplier is the entity that sells heating, cooling or hot water into your home through a communal or district system. Under the regulatory guidance, an authorised person is considered a supplier if they supply heating, cooling or hot water to heat network consumers by means of a relevant heat network¹. The heat itself arrives from a central plant through a network of underground pipes carrying hot water².

The defining feature of the relationship is that there is no market. Heat networks are natural monopolies, one entity is the supplier for all homes and businesses on the network, and most consumers cannot switch suppliers or move to a different tariff³. That single fact shapes everything else on this page: how complaints work, what protection exists, and why regulation rather than competition is the mechanism for holding a supplier to account.

Since 1 April 2025, all heat network suppliers have been bound by the Energy Ombudsman's scheme rules and are required to be members of it⁴. From the same date, the Ombudsman can help consumers and small businesses resolve heat network disputes⁵. The service is free to consumers⁴.

What a heat network supplier is, and who supplies your home

The supplier is not the same thing as the operator, though on many networks one organisation holds both roles. The supplier is the party that bills you for heat; the operator runs the pipes, plant and equipment. Where the authorised person is both supplier and operator, they are required to meet the expectations of the Supplier Standards of Conduct, which are higher than for authorised persons who are operators only². Operators are also required to share information with the supplier where that sharing is necessary for the supplier to comply with those standards².

Finding out who supplies your home starts with your bill, because the supplier's name must appear on it. Where that is not clear, the Energy Ombudsman directs people to the Energy Networks Association website to identify the network provider⁸. If the network is not registered on the Ombudsman's own site, the Ombudsman can be contacted on 0330 440 1624 to raise the dispute⁹.

The scale of the sector is mixed. Some networks are run by housing associations and named as heat networks in the Ombudsman's register, including River Clyde Homes¹⁰, Cynon Taf Community Housing Ltd¹¹ and Sanctuary Housing Association⁶. Others are commercial heat suppliers, among them Theodore Stevenage Limited¹², Metropolitan Infrastructure Limited¹³, London Square (Spitalfields) Management Company Ltd¹⁴, ESP Heat Ltd¹⁵, Theodore Bracknell Limited¹⁶, Vivid Housing Limited¹⁷, Beardvale Ltd¹⁸ and Greenhill Housing Association¹⁹. Membership of the scheme is what makes each of them reachable through the Ombudsman.

For a household, the independence question is stark. A heat network can remove exposure to a domestic gas boiler and to the gas grid, and it can run on heat sources a single home could not access. What it does not remove is dependence on a supplier: there is no switching route, no competitive tariff, and no alternative provider on the same pipes. The household's leverage is regulatory and procedural, not commercial.

Suppliers that are also landlords: the double duty

A large share of UK heat networks sit inside social housing, purpose-built blocks and managed developments, which means the supplier is frequently also the landlord. The guidance is explicit that where the supplier is also the landlord for the property on the heat network, they should follow both the authorisation conditions and relevant housing legislation²⁰. Two regimes apply at once, and neither cancels the other.

That matters because the two roles create different obligations and different routes of complaint. As a supplier, the organisation owes the consumer protection duties set out in the authorisation conditions. As a landlord, it owes duties under housing law, including on the safety and condition of the home. In Wales, for example, landlords' duties under the fitness for human habitation regime include providing controllable heating systems²¹.

The practical consequence is that a householder with a problem may need to be clear about which hat the organisation is wearing. A billing error is a supplier matter. A heating system that cannot be controlled, or a home that is cold because of the fabric of the building, may be a landlord matter. Where the same body is both, the complaint can legitimately raise both, but the escalation routes differ: supplier disputes go to the Energy Ombudsman, while housing disputes follow the landlord's own complaints process and, ultimately, the relevant housing ombudsman for the nation.

The double duty also raises the stakes on record-keeping. Where a landlord charges for heat through rent or a service charge rather than a separate heat bill, the guidance states that when individual metering comes into effect for networks covered by the Landlord and Tenant Act, suppliers would be expected to charge for heat separately and unbundle the heat charge from service charges or rent². That separation is what makes a heat charge visible, and therefore disputable, as its own item.

What your supplier must do: billing, outages and vulnerability support

The obligations on a heat network supplier go well beyond sending a bill. Heat network suppliers are obliged to identify occupants in vulnerable situations and to provide them with any relevant additional support, including offering to put them on the Priority Services Register³. Those protections apply to domestic consumers; the guidance states they are not relevant to non-domestic consumers².

Support during an interruption is a specific duty. Operators are expected to offer appropriate alternative sources of heat to consumers in vulnerable situations during interruptions to supply, to maintain a priority register and to proactively check in with affected consumers². Vulnerability support also includes being able to raise and progress a complaint through a third party, such as carers, guardians and advocacy bodies².

On money, suppliers must signpost and refer to external debt advice services, such as Citizens Advice and National Debtline², and are required to provide for the setting of payment plans over a longer than normal period where the consumer is in a vulnerable situation². The guidance also expects authorised persons to consider their consumers' needs and the scale and complexity of their heat network in order to allocate resources accordingly².

Suppliers must tell consumers how to contact the relevant consumer advice organisation, whether Citizens Advice or Consumer Scotland¹. For consumers in Scotland, the relevant consumer advice bodies are Citizens Advice Scotland and Consumer Scotland, and any related, qualifying consumer advice bodies³.

What your bills must show on a metered network

Bills and billing information provided to the relevant consumer for the consumption of heating, cooling or hot water on metered heat networks must be accurate and based on actual consumption³. The same standard appears in the draft guidance: accurate, and based on actual consumption¹.

At a minimum, at least once a year a bill must be issued to the relevant consumer using a supply meter on the basis of actual rather than estimated consumption, provided a reasonably accurate meter reading has been provided or taken³. The Heat Network (Metering and Billing) Regulations require that, where cost effective and technically feasible, heat network suppliers must provide individual meters to heat network customers, and provide them with bills based on the meter readings²².

The minimum content of billing information is long and specific. It includes current charges, consumption information, a comparison with the same period in the previous year, the terms of supply, contact details for the relevant consumer advice body, supplier and billing agent contact details, complaints contact, emergencies contact, energy saving information, support mechanisms, the authorised person's identification number allocated by the Authority (if any), and Energy Ombudsman details¹. Consumption comparisons should, if possible, be displayed in a graph and use estimates of consumption where necessary, alongside estimates of the charges the consumer is likely to pay in future².

Unmetered consumers are not left out. As a minimum, unmetered heat network consumers must be provided with the charges for the relevant period, a clear and understandable explanation of how their bill has been calculated, and the final due date for payment together with the acceptable methods of payment³. The guidance states that if the relevant consumer is on an unmetered heat network, the supplier should employ the same billing and billing information requirements as for metered networks¹.

The Heat Interface Unit: how heat enters your home

The heat interface unit, usually shortened to HIU, is the piece of equipment inside the home that takes hot water from the network and transfers it to your heating and hot water. It is the domestic boundary of a system whose pipes are shared, and it is the part of the network a resident actually interacts with.

The guidance places a duty on the operator to explain it. Heat network operators should ensure that consumers are proactively and regularly informed about how to interact with key parts of the network infrastructure, such as heat interface units, at regular intervals or during key events like tenancy changes or maintenance visits². In other words, the explanation is not supposed to wait until something breaks.

Responsibility for the HIU is a common source of confusion, and the split generally follows the boundary. The network side, including the pipework and plant that serve the whole building, sits with the operator. The unit inside the home is where the two responsibilities meet, and the practical answer to who fixes it depends on the terms of supply and, where the supplier is also the landlord, on the tenancy. Because the guidance requires operators to inform consumers about how to interact with the HIU, the first step for a householder is to check what the supplier or landlord has already told them about the unit and its controls.

When things go wrong: complain to your supplier first

Every route starts in the same place. Customers who believe they have been unfairly treated by their heat network provider should complain to their provider in the first instance²². Ofgem's advice is equally direct: if you are on a heat network, contact your heat network supplier about the problem²³. The Energy Ombudsman's own instruction is to speak to your energy supplier first to raise a complaint, and if they cannot help, the Ombudsman will aim to fairly and impartially resolve the dispute²⁴.

The party responsible for handling complaints is the Energy Ombudsman, but before contacting the Ombudsman, consumers should first notify their heat supplier and try to resolve the issue¹. The heat supplier has eight weeks to resolve the complaint¹. The decision document confirms that the period after which a complaint can be escalated to the Energy Ombudsman remains eight weeks for heat networks³.

Where a landlord or site owner resells energy, the same first step applies: contact them first²⁵. Where a household has its own contract with an energy supplier, the supplier's complaints procedure applies, and the details should be on the bill or on the supplier's website²⁵. Typical complaint subjects include late, incorrect or missing bills, back billing, being overcharged, a faulty meter, poor customer service, and refusing to refund credit from an account²⁶.

Escalating to the Energy Ombudsman: the 8-week rule and deadlock letters

The Energy Ombudsman provides an independent escalation route for consumer complaints²⁷. It describes itself as an independent service, separate to Ofgem, for problems with an energy supplier, an energy broker, a network operator or a heat network supplier²³. Its dispute scope covers energy suppliers, energy brokers, network operators, Green Deal providers and heat network suppliers²⁸.

Eligibility for a heat network dispute turns on two things: having complained to the supplier already, and either holding a deadlock letter or having waited eight weeks. The standard wording is that it has been at least eight weeks since the issue was first raised with the supplier, or a deadlock letter has been received⁶. The same condition appears across the Ombudsman's heat network pages¹². A deadlock letter is described as a letter stating that the problem cannot be fixed or that the supplier believes there is no more it can do²⁶.

The evidence requirement is specific. A complainant must have sufficient evidence to support the case, including the date the complaint was raised with the supplier¹², and the supplier name on the dispute must match the account holder's bill¹⁵. The Ombudsman can be reached on 0330 440 1624, pressing option 3 for Heat Networks when prompted⁹, and by post at Energy Ombudsman, P.O. Box 966, Warrington, WA4 9DF²⁹.

What the Ombudsman can and cannot do, and what awards look like

The Ombudsman's powers are remedial, not punitive. It states that it cannot punish companies, dictate how companies operate, or issue fines⁷. What it can do is tell suppliers to take practical action, such as crediting or cancelling an account or changing a tariff, to make an apology, or to offer a financial award, or a combination of these, and it may make recommendations to prevent the issues happening again⁷.

Financial awards are based on the cost of putting things right, such as ensuring the consumer has been charged accurately, clearing unfair charges or fixing faults⁷. The maximum is up to £10,000 for domestic energy disputes or up to £20,000 for small business disputes, and the same ceilings apply to heat networks and to energy networks⁷. The level of maximum financial award may vary depending on the type of energy company and the Terms of Reference that cover that scheme⁷.

On timing, most disputes are resolved within six weeks of the Ombudsman receiving evidence from both parties⁷. The service is free to consumers looking to resolve energy disputes⁴. It can process complaints for both domestic and small business consumers in the energy sector²⁸, and from 1 April 2025 it can help consumers and small businesses resolve heat network disputes⁵.

Small business eligibility has thresholds. A microbusiness is defined as a company with an annual consumption of electricity of not more than 100,000 kWh, or gas consumption of not more than 293,000 kWh⁴. There are also exceptions to scheme membership: disputes that relate to heat suppliers who were members of Heat Trust prior to 1 April 2025 and are specifically about Heat Trust scheme rules, or that concern certain issues relating to the Energy Bills Relief Scheme or Energy Bills Discount Scheme⁴.

What the Ombudsman can do about EBRS and EBDS pass-through

The Energy Ombudsman can review disputes with any heat network if the heat network supplier has not done what is required of them by the Energy Bill Relief Scheme and Energy Bill Discount Scheme legislation³⁰. This is a distinct route from the general heat network dispute service, and it exists because support schemes for heat network customers depend on suppliers passing benefits through.

Under the EBRS, a complaint can be made on grounds that the supplier has not notified the customer that it has benefited from the scheme, has not notified how it will pass through the benefit, has not passed on the benefit within the timeframe required by the regulations, or has not otherwise complied with pass-through requirements³⁰. Under the EBDS, the grounds cover a supplier provided with the higher level of heat network EBDS support failing to notify the customer of the benefit, failing to notify how and when it will pass on the higher discount rate, failing to pass on the benefit within the required timeframe, or otherwise failing to comply with pass-through requirements³⁰.

The background is that these schemes require third party intermediaries to pass on benefits to end users²². Where a heat network is not registered on the Ombudsman's website, the Ombudsman asks that it be contacted on 0330 440 1624 to raise the dispute³⁰.

Free help: Citizens Advice and Consumer Scotland

Advice is free and separate from the supplier. Suppliers must tell consumers how to contact the relevant consumer advice organisation, whether Citizens Advice or Consumer Scotland¹. For consumers in Scotland, the relevant consumer advice bodies are Citizens Advice Scotland and Consumer Scotland, and any related, qualifying consumer advice bodies³.

Energyadvice.scot runs a free service for Scottish citizens who have questions about their energy supplier, want to understand their supplier's complaints process, or have problems with their energy bills²⁶. In Scotland, the Heat Network Support Unit is sponsored by the Scottish Government and delivered in partnership with Scottish Futures Trust and Zero Waste Scotland²⁷.

The wider consumer landscape differs by nation. The Consumer Council for Northern Ireland covers electricity, oil and gas switching matters in Northern Ireland, and publishes comparison tables and tariff change notices for the separate Northern Ireland market. Households in England, Wales and Scotland are served by Citizens Advice, with Consumer Scotland and Citizens Advice Scotland taking the Scottish role.

For a household on a heat network, these bodies are the practical first stop for understanding what a supplier owes, before any formal dispute begins. They do not decide disputes and cannot compel a supplier, but they can explain the standards, help frame a complaint, and point to the correct escalation route.