via Reed · 23 September 2026 ·2 days ago

Commercial Gas Engineer

Reed
Hemel Hempstead Full-time GBP 55,000 – 60,000
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Mobile Combustion & Mechanical Engineer

Location: Greater London, West End, City of London & Home Counties
Salary: £55,000 - £60,000 DOE + Company Van + Pension
Job Type: Permanent
Hours: Monday to Friday, 8:00am - 5:00pm

About the Role

Due to continued growth within a specialist Energy Centre Services division, an exciting opportunity has arisen for an experienced Mobile Combustion & Mechanical Engineer to join a growing engineering team supporting a portfolio of commercial and energy centre sites across London and the surrounding areas.

This role is ideally suited to a skilled Commercial Gas Engineer with strong mechanical knowledge who enjoys working on a variety of critical plant, heating and energy centre systems. You will be responsible for carrying out planned preventative maintenance, reactive repairs, fault finding and plant optimisation across a diverse range of sites.

Key Responsibilities

  • Carry out planned and reactive maintenance within plant room environments.

  • Service and maintain commercial gas boilers ranging from 250kW to 10MW.

  • Maintain associated equipment including gas boosters, plate heat exchangers, flue systems and gas safety equipment.

  • Carry out pump overhauls, bearing changes, seal replacements, valve repairs and pipework modifications.

  • Service and fault-find on AHUs, FCUs, HIUs, chillers, cooling towers, pressurisation units and associated HVAC plant.

  • Conduct water treatment monitoring and support Legionella compliance activities.

  • Carry out basic electrical fault finding, motor testing and BMS monitoring.

  • Attend breakdowns and emergency call-outs as required.

  • Produce service reports and recommend remedial works and plant improvements.

  • Liaise with clients, site contacts and subcontractors to ensure excellent service delivery.

  • Ensure all works are completed in line with Health & Safety regulations and company procedures.

Requirements

Essential

  • Valid Commercial Gas Qualifications.

  • Proven experience working as a Commercial Gas Engineer within Building Services, Energy Centres, District Heating or Critical Plant environments.

  • Strong mechanical maintenance and fault-finding skills.

  • Experience working on large commercial boilers and associated mechanical plant.

  • Good understanding of HVAC and M&E systems.

  • Full UK Driving Licence.

  • Strong communication and customer-facing skills.

  • Ability to work independently and manage workload effectively.

Desirable
  • Time-served Mechanical or Electrical Apprenticeship.

  • HNC/HND qualification.

  • Legionella (L8) awareness and experience.

  • Experience working within energy centres or district heating networks.

  • Experience using CAFM systems.

Package
  • £55,000 - £60,000 basic salary depending on experience.

  • Company Van.

  • Contributory Pension Scheme.

  • Overtime opportunities available.

  • Participation in a call-out rota.

  • Ongoing training and professional development.

  • Long-term career progression opportunities.

  • Opportunity to join a growing and ambitious engineering team working within a rapidly expanding sector.

This is an excellent opportunity for a technically strong engineer who takes pride in delivering high standards, enjoys problem-solving and is looking to join a business where they can make a genuine impact and progress their career.

The market for this type of role

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