Heat network rules for buildings with communal boiler plant

Commercial engineers covering Suffolk, Essex and Cambridgeshire

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If one boiler plant room serves several tenants, units or buildings, and the people who receive the heat are charged for it, the building may count as a heat network. Since 27 January 2026 heat networks in Great Britain have been regulated by Ofgem, and operators and suppliers of relevant networks must register with Ofgem by 26 January 2027. This guide explains what counts, what has changed, and how good maintenance of the communal boiler plant supports the new rules.

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Commercial heating tips and advice · 5 November 2026 · Fast Commercial Boiler Help, Gas Safe 985448

Heat network regulations and communal boilers: does your building count?

Ofgem says heat networks "provide heating, cooling and hot water to more than one property in a building or to more than one building from a central source." GOV.UK's guidance on the Heat Network (Metering and Billing) Regulations 2014 describes four main components:

a shared source of heat for multiple users;
a heat transfer medium of water, steam or chilled liquids;
heat used for heating, cooling, hot water or processes;
heat sold to final customers by heat suppliers.

So a communal boiler serving a multi-let office block, a business park or a mixed-use building can fall within scope where occupiers pay for the heat. Whether your building is in scope is a legal question; check Ofgem's guidance or take advice. This post is general information only.

What changed in 2026

GOV.UK says the Heat Networks (Market Framework) (Great Britain) Regulations 2026 "were introduced on 27 January 2026", and that under them "Ofgem have assumed their role as the regulator for heat networks". To avoid duplicate duties, the older metering and billing regulations were partly revoked in Great Britain. In particular, GOV.UK says the duty to notify and the use of the cost-effectiveness tool "have been revoked" for heat suppliers in Great Britain, while operational networks must still "maintain meters where they are already present". Northern Ireland keeps the 2014 regulations unchanged.

Ofgem says all operating heat networks were automatically authorised to keep supplying heat ("deemed authorisation"), it has published rules called authorisation conditions, and it has launched a digital service for registration. Operators and suppliers of relevant networks "must give us details about their heat network's organisation, ownership, financial resilience and consumer protection arrangements by 26 January 2027". Suppliers must also register with the Energy Ombudsman's heat network supplier scheme.

Operator, supplier and who maintains the plant

Ofgem explains that "Operators control and maintain the network" and "Suppliers provide customers on the network with heating, cooling or hot water". The same organisation can be both. On a commercial building this is often the landlord or managing agent. Ofgem lists good customer service, "reducing the impact of reliability of supply issues", clear bills and fair pricing among the outcomes it focuses on, and GOV.UK notes that Energy Ombudsman complaints can include "unplanned outages which may lead to consumer compensation". Reliable boiler plant is therefore part of meeting your obligations, not just a comfort issue.

Technical standards are coming: HNTAS

The government is introducing mandatory technical requirements and a Heat Network Technical Assurance Scheme (HNTAS). GOV.UK says it "will be phased in over time, with a planned launch in 2027", that many requirements "build on the voluntary standards set out in CIBSE CP1 (2020)", and that it will apply "from communal to city wide district systems, including both new build and existing networks". The final design has not yet been published, so don't rely on any specific requirement until the government response is out.

Practical steps for communal boiler plant

Keep the plant on a planned maintenance schedule. Industry task libraries such as SFG20 and CIBSE Guide M are commonly used to set frequencies; see our planned preventive maintenance page.
Keep service reports, gas safety records and meter records together; see heating maintenance records insurers ask for.
Have a clear route for reporting outages and a named contractor; for cascade or modular plant see cascade boiler repair.
Agree in writing who controls the plant under the lease; see commercial landlord heating responsibilities.
Look after system water quality, which affects heat exchangers and heat interface units; see water treatment for commercial heating.

Safety duties don't change

Under the Gas Safety (Installation and Use) Regulations 1998, gas appliances and flues at a place of work must be maintained in a safe condition by whoever has control of them, and all gas work must be done by a Gas Safe registered engineer. Site staff should never work on burners, flues or safety devices. Where plant falls under the Pressure Systems Safety Regulations 2000 (HSE's INDG178 lists steam and pressurised hot water above 110 °C), the duty holder needs a written scheme of examination; see PSSR written schemes explained.

Run a building with communal boiler plant?

We service, repair and replace commercial boiler plant for landlords and managing agents. Call 0800 0996 007 or see our landlords and property managers page. All gas work is carried out by Gas Safe registered engineers (985448). See also commercial boiler servicing and sectors we work in. We don't give legal advice on heat network registration; contact Ofgem for that.

Safety note

Under the Gas Safety (Installation and Use) Regulations 1998, gas work must be carried out by a Gas Safe registered engineer, and we apply that rule on every site. Don't attempt DIY work on gas appliances, burners, flues or safety devices. On pressure systems, trained site staff should stick to visual and gauge checks, log the readings and report anything abnormal. Never adjust, cap, plug or test-lift a relief valve yourself.

Talk to a Gas Safe commercial engineer

Fast Commercial Boiler Help is a Gas Safe registered (985448) commercial heating business based at 4 Market Hill, Clare, Sudbury, Suffolk CO10 8NN. Our team of over 10 local engineers covers East Anglia and East London, working on commercial boilers, plant rooms, water heaters, and warm air, radiant and unit heaters. We work on commercial premises only.

Call 0800 0996 007

Call or WhatsApp 07947 578332 (a photo of the appliance data plate or the fault display helps) · Email [email protected]

Frequently asked questions

Is a communal boiler a heat network?

It can be. Ofgem describes heat networks as supplying heating, cooling or hot water to more than one property in a building, or more than one building, from a central source. Under the GOV.UK description the heat must also be sold to final customers. Check Ofgem's guidance for your building.

Who regulates heat networks in Great Britain?

Ofgem. GOV.UK says that under the Heat Networks (Market Framework) (Great Britain) Regulations 2026, introduced on 27 January 2026, Ofgem took on the role of regulator for heat networks in England, Scotland and Wales.

When must heat networks register with Ofgem?

Ofgem says operators and suppliers of relevant heat networks must give it details of the network's organisation, ownership, financial resilience and consumer protection arrangements by 26 January 2027. Suppliers must also register with the Energy Ombudsman's heat network supplier scheme.

Do I still need to notify under the Heat Network (Metering and Billing) Regulations?

Not in Great Britain. GOV.UK says the duty to notify and the cost-effectiveness tool have been revoked for heat suppliers in Great Britain, but existing meters must be maintained. In Northern Ireland the 2014 regulations still apply.

What is HNTAS?

The Heat Network Technical Assurance Scheme is a planned scheme for mandatory technical standards on heat networks. GOV.UK says it will be phased in, with a planned launch in 2027, and will cover communal and district systems, both new and existing.

Sources and further reading