Heating Engineer

A heating engineer installs, services, repairs and commissions systems that heat buildings and provide hot water — gas boilers, heat pumps, underfloor heating, radiators, pipework and controls. Most work either in people's homes for a domestic installation or service firm, or on larger commercial and industrial systems (schools, hospitals, offices, plant rooms) for a mechanical contractor or facilities provider. It is a hands-on, site- or home-based trade role rather than an office job, though graduates often enter it through design, commissioning or project-focused routes that sit alongside the tools.

Starting salary: £26k–£35k
Live graduate jobs: 7 open now
Main way in: Apprenticeship is the standard and most common route into the…
They usually ask for: For hands-on gas work

Approximate graduate salary

Trainees and apprentices typically start low — apprenticeship pay is often at or near the apprentice minimum wage early on. A newly qualified, Gas Safe registered engineer might expect roughly £26,000–£35,000 as an approximate guide, with experienced engineers, commercial gas specialists and those in London and the South East earning noticeably more. Graduate entry into building services design or commissioning roles tends to start in a broadly similar range. These figures are approximate and vary a great deal by employer, region, overtime and call-out arrangements, and whether you are employed or self-employed.

What you'd actually do

Driving to a sequence of jobs across a patch — on a domestic service round that might mean several boiler services or breakdowns in a day, each with paperwork completed on a tablet or phone app before moving on
Diagnosing faults: testing gas pressures and flue gas readings, checking electrical controls and sensors, bleeding and balancing systems, identifying whether the problem is the appliance, the pipework, the controls or the water quality
Installing or replacing equipment — lifting out an old boiler or cylinder, running copper or plastic pipework, fitting pumps, valves and thermostats, pressure-testing and filling the system, then commissioning it and showing the customer how to use it
Commissioning and balancing larger systems on commercial sites: setting flow rates across circuits, proving pumps and valves operate on the building management system, and recording readings for the handover file

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Completing compliance records — Gas Safe notifications, benchmark certificates, landlord gas safety records, risk assessments and method statements for commercial sites, and photographs as evidence for warranty or funding schemes
Talking to customers or site managers about what is wrong, what it will cost, and what the options are — including delivering unwelcome news that a system needs replacing rather than fixing
Ordering parts, managing van stock, and coordinating with electricians, plumbers and builders when a job needs more than one trade; on larger contracts, attending site progress meetings

How graduates get in

Apprenticeship is the standard and most common route into the trade — a plumbing and domestic heating or gas engineering apprenticeship combining college with employed work. Graduates can and do take these, though some employers will question why a graduate wants one, so be ready to explain your motivation
Managed Learning Programme (sometimes called an adult fast-track gas course) at a private training centre, followed by a portfolio of supervised work and then ACS assessment to get on the Gas Safe Register. This is the usual career-changer route and is open to graduates, but it is self-funded and typically costs thousands of pounds
A degree in building services engineering, mechanical engineering or renewable energy, entering via a graduate scheme with a mechanical and electrical (M&E) contractor, consultancy or facilities management firm. This leads to heating system design, commissioning management or project engineering roles rather than a tools-based trade role, and is the most common graduate path
Heat pump and low-carbon heating roles are a growing entry point — manufacturers, retrofit installers and energy suppliers recruit for design, surveying and commissioning positions, and some will train people with a relevant technical degree. Note that MCS certification (the quality scheme for small-scale renewable installations) sits with the company, with individual installers needing specific heat pump training

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Joining a large installer, housing association or facilities contractor as a trainee or engineer's mate and being trained on the job. Less structured than an apprenticeship and quality varies enormously, but it happens
Transferring in from a related trade — qualified plumbers adding gas qualifications is very common, and is often how people end up with the job title

What employers ask for

For hands-on gas work: an NVQ or equivalent competence qualification in domestic or commercial gas, plus current ACS (Accredited Certification Scheme) assessments and Gas Safe Register membership. Gas Safe registration is a legal requirement for anyone working on gas appliances in the UK — this is non-negotiable and must be renewed, usually every five years per ACS category
A degree is genuinely not required for the trade role and will not substitute for the practical qualifications. For design, commissioning management or project engineering roles, a degree in building services, mechanical engineering or a closely related subject is usually expected, often at 2:1 but this varies and relevant experience can count for more
A full UK driving licence is close to universal — almost all roles involve a van and travelling between sites
A CSCS or ECS card for site access on commercial and construction work; some employers also want asbestos awareness, working at height or confined spaces training depending on the setting

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Additional qualifications depending on what you work on: unvented hot water storage, water regulations, F-Gas (for refrigerant-containing systems including some heat pumps), oil (OFTEC) or solid fuel (HETAS), and heat pump installation training
Enhanced DBS checks are common where you work in people's homes, schools or healthcare settings

Skills that matter

Systematic fault diagnosis

Most call-outs are a symptom rather than a cause, and working logically through pressure, flow, electrical supply and controls is faster and cheaper than swapping parts until something works.

Practical manual dexterity and physical stamina

You will be soldering pipework in a loft, kneeling in an airing cupboard or lifting a cylinder up a staircase, often in cramped or cold conditions.

Reading technical drawings and manufacturer instructions

Installations have to follow the specific appliance instructions and the relevant building regulations, and on commercial work you are working from mechanical drawings and schedules.

Explaining technical problems to non-technical people

Customers decide whether to spend money based on how clearly you set out the options, and a lot of complaints come from poor explanation rather than poor workmanship.

Safety discipline and regulatory awareness

Gas and electrical work can kill people, and the law requires specific checks, certificates and notifications — cutting corners risks prosecution and removal from the Gas Safe Register.

Basic electrical competence

Modern heating is as much about controls, sensors, wiring centres and smart thermostats as it is about pipes, and heat pumps in particular are heavily electrical.

Self-management and time estimation

You are usually working alone against a day's job list, and misjudging how long a job takes affects every customer after it.

Putting these on a CV? We counted which skills 12,914 live graduate adverts ask for, and what to do with the answer — part of our application advice.

Where it leads

Trainee or apprentice working under supervision, building a portfolio of real jobs — typically around three to four years for an apprenticeship, or considerably faster on a fast-track course followed by supervised site experience, though gaining genuine competence takes longer than gaining the certificate.
Qualified, Gas Safe registered engineer working independently on domestic systems. At this point pay rises sharply and many people stay here for a long career by choice.
Broadening into higher-value work: commercial gas, heat pumps and low-carbon heating, unvented systems, or complex plant. Each new category means more training and assessments but opens up better-paid contracts.
Supervisory and technical roles — lead engineer, supervisor, quality or compliance inspector, technical support for a manufacturer, trainer at a college or training centre, or commissioning manager on larger projects. Timescales vary widely and depend more on who you work for than on years served.
Self-employment or running a business — a large share of heating engineers end up either working as subcontractors or building their own installation firm. Alternatively, for those who came in via a degree route, moving into building services design, energy consultancy, retrofit coordination or project management.

What people get wrong

“It is basically plumbing with a different name.”

Plumbing and heating overlap heavily and many people do both, but gas work is separately regulated and legally restricted to Gas Safe registered engineers. Modern heating work also involves a lot of electrical controls, system design and increasingly heat pump refrigeration knowledge that is not part of general plumbing.

“Gas boilers are being banned, so the trade is a dead end.”

The direction of travel is towards heat pumps and other low-carbon systems, but the existing gas stock will need servicing and repairing for a very long time, and the transition is creating demand for engineers who can do both. The real risk is standing still — engineers who do not add heat pump or low-carbon skills will see their options narrow over a career.

“A degree will get you in faster or at a higher level.”

For tools-based work, a degree counts for very little — competence is evidenced through specific vocational qualifications and assessments, and a graduate starts in the same place as anyone else. A degree only changes your starting point if you are going into design, consultancy or project management, which is a different job to installing heating.

“It is all boiler repairs in people's houses.”

A substantial part of the market is commercial and industrial — plant rooms in hospitals and schools, district heating networks, industrial process heat, and planned maintenance contracts. These roles involve more documentation, site coordination and shift or standby work, and are quite different in character from domestic service rounds.

“Once you are qualified, the training stops.”

ACS assessments must be retaken periodically to keep your registration, manufacturers run product-specific courses, and regulations and technology change often enough that ongoing training is a permanent feature of the job.

Where this varies

The job varies enormously depending on sector. Domestic service and repair work means a high volume of short jobs in customers' homes, often with targets on jobs completed per day, and it is dominated by boiler servicing and breakdowns. Commercial and industrial heating means fewer, larger jobs in plant rooms, more paperwork, site inductions and permits to work, and often standby or shift rota cover. Social housing and local authority contracts involve a heavy compliance element — annual landlord gas safety checks on a fixed schedule — and usually DBS checks. Working for a manufacturer as a field service engineer means focusing on one product range in depth. Regionally, demand is steady across the UK but pay and the mix of work differ; London and the South East pay more but travel and parking eat into the day. There is also a big split between employed roles with a company van, structured training and a fixed salary, and self-employed or subcontract work where you supply your own tools and insurance and earn per job. The heat pump side of the trade is still developing and practice is less standardised than gas work — training quality and the volume of available work vary a lot by employer and area.

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General guidance about the role across the UK market, not about any specific employer. Entry routes and requirements vary — always check the individual job advert.