HIU Engineer

Vital Energi; City Of London; On-site; GBP 32,000 - 54,000; Full time

Job summary

Vital Energi is seeking a field-based HIU Engineer to service and repair Heat Interface Units across London. You will diagnose faults, work on HIUs, radiators, thermostats and LTHW systems as part of a district heating network serving thousands of residents.

The role combines planned servicing with reactive fault-finding; prior experience with S-Plan/Y-Plan and low-temperature hot water is preferred. A City & Guilds qualification (or equivalent) and a UK driving licence are required; degree

Qualifications

• Hold a City & Guilds qualification or equivalent.
• Preferably educated to Degree level.
• Experience with Boilers/Heating, HVAC and related systems.
• Full UK manual driving licence.

Responsibilities

• Complete scheduled servicing of Heat Interface Units per procedure.
• Provide reactive maintenance for loss of services within SLAs.
• Identify and review equipment faults and carry out repairs.
• Input and maintain records using asset management software.
• Perform ad hoc maintenance in Energy Centre Plantrooms.
• Work safely in line with Health & Safety policy.

Skills

HIU systems

Reactive maintenance

LTHW knowledge

S-Plan knowledge

UK driving licence

Education

City & Guilds qualification

Degree level preferred

Job description

HIU Engineer

Join the Team Powering London’s Low-Carbon Future

We're looking for a motivated HIU Engineer to help us deliver exceptional service across London’s most innovative energy networks.

If you’re ready to take your plumbing or heating career to the next level and want to be part of the UK’s transition to a cleaner, greener future this is the role for you.

About the role

The HIU Engineer is a field-based heating engineer responsible for maintaining, servicing and repairing Heat Interface Units (HIUs) and associated heating systems across London and the surrounding areas. Supporting a district heating network serving approximately 25,000 residents, the role is focused on ensuring customers have reliable heating and hot water within their homes.

The position combines planned servicing with reactive fault‑finding, requiring engineers to diagnose and repair a wide range of heating system issues including HIUs, radiators, thermostats, motorised valves and heating controls. Engineers are expected to be comfortable working on S-Plan and Y-Plan systems and have a good understanding of low temperature hot water (LTHW) heating systems.

Whilst the role is primarily resident‑facing, candidates should also have a basic understanding of district heating infrastructure and energy centres. HIU Engineers are often the first responder to heating outages and should be capable of carrying out initial diagnostics, identifying whether faults originate from the HIU, heating system or energy centre, and escalating plant‑related issues where necessary.

Typical workloads include servicing 8-10 HIUs per day or attending 6-8 reactive heating and hot water breakdowns. Engineers participate in a 1-in-4 emergency call‑out rota covering London and the surrounding areas alongside other HIU and Plant Engineers.

This role is ideal for experienced domestic or communal heating engineers looking to specialise within the growing district heating sector.

Key responsibilities

• Completing scheduled servicing of Heat Interface Units in accordance with the servicing procedure
• Providing reactive maintenance for loss of services within required Service Level Agreements
• Identification and review of equipment faults carrying out repairs where required
• Inputting and maintaining documentation and records using the company asset management software
• Carrying out general ad hoc maintenance tasks within Energy Centre Plantrooms
• Working in a safe manner and in accordance with the company’s Health & Safety policy

What you will need

• Hold a city & guilds qualification or equivalent
• Preferably educated to Degree level
• Experience wiring and fixing, Boilers/Heating, HVAC, Steam, Air Handling, Cooling, Renewable Energy (e.g Solar or Heat Pumps), or similar
• Full UK manual driving licence

The Company

Vital Energi is a major provider of renewable energy infrastructure and systems to the public and private sectors. We are supporting Hospitals, Universities, New Build developments, Towns and Cities as well as Industrial and Commercial clients to decarbonise their buildings.

We have and continue to work on ground‑breaking projects throughout the UK which are supporting the UK’s Net Zero targets, such as the recently announced £1 billion low‑carbon infrastructure project for Westminster.

With plans to double our headcount over the coming years, supported by offices opening in new locations across the country and our strong investment pipeline, coupled with our expansion into new markets such as industrial power generation with our very own Energy‑from‑Waste facility, there is no better time to join the family here at Vital Energi.

The company is opposed to all forms of discrimination and will select for employment, training and promotion on the basis of suitability for the job and/ or merit. It is company policy that no job applicant or employee receives less favourable treatment than another on the grounds of sex, race, colour, age, ethnic or national origins, political affiliations, religious beliefs, marital status, physical disability or is disadvantaged by unjustifiable conditions or requirements.

Applicants must have the unrestricted and ongoing right to work in the UK for the duration of employment, without the need for sponsorship. Due to the nature of this role, we are unable to support visa sponsorship or employ individuals with time‑limited permission or conditions attached to their right to work in the UK