HIU Engineer

Vital Energi; Greater London; Hybrid; GBP 42,000 - 64,000; Full time

Job summary

Vital Energi in London is seeking a motivated HIU Engineer to maintain, service and repair Heat Interface Units and related heating systems across London and surrounding areas. This field-based role focuses on delivering reliable heating and hot water to residents within a 25,000-user district heating network, combining planned servicing with reactive fault-finding and on-site diagnostics.

You should have a City & Guilds qualification or equivalent, a UK driving licence, and experience with

Qualifications

• 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).
• Full UK manual driving licence.

Responsibilities

• Completing scheduled servicing of HIUs and related heating systems.
• Providing reactive maintenance for loss of heating services within SLAs.
• Diagnosing faults and carrying out repairs as required.
• Maintaining documentation using asset management software.
• Carrying out general ad hoc maintenance tasks in plantrooms.
• Working safely according to Health & Safety policy.

Skills

Boilers/Heating

HVAC

Steam

Air Handling

Cooling

Renewable Energy

Solar

Heat Pumps

Driving licence

Education

City & Guilds qualification or equivalent

Degree level

Job description

Ref 221 Business Unit | Department Energy and Asset Management | E&AM Operations & Maintenance Location Site-Based - South/ London Employment type Full-time Salary Attractive salary plus benefits Closing date 15/11/2026 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.

Applications will be processed within 28 days of receipt. If you have not heard from us within this time period it will mean that your application has unfortunately been unsuccessful.

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