The Commercial Gas Engineer is responsible for the installation, maintenance, fault diagnosis, and repair of commercial gas‑fired systems and associated plant across commercial and residential‑scale properties. The role requires strong working knowledge of commercial heating systems, including CHP units, HIUs, and low‑carbon technologies such as Air Source Heat Pumps.
Responsibilities
Install, service, and maintain commercial gas appliances and plant
Diagnose and repair faults on commercial boilers and associated systems
Maintain and repair commercial gas pipework and valves
Carry out combustion analysis and performance testing
Ensure compliance with Gas Safety (Installation & Use) Regulations
Complete commercial gas safety checks and documentation
Service, maintain, and fault‑find Heating Interface Units
Diagnose heating and hot water issues relating to HIUs
Balance, commission, and pressure‑test HIU systems
Liaise with heat network operators and building management systems (BMS)
Carry out HIU replacements and upgrades where required
Carry out planned maintenance on CHP units
Diagnose and repair CHP mechanical and control faults
Monitor system efficiency and thermal output
Work with electrical and control specialists where required
Ensure CHP systems operate safely and efficiently within plant rooms
Maintain and fault‑find Air Source Heat Pumps (ASHPs)
Understand integration of ASHPs with commercial heating systems
Support hybrid systems (gas + renewable technologies)
Monitor system performance and efficiency
Work safely in commercial plant rooms
Maintain pumps, pressurisation units, valves, and expansion vessels
Support commissioning and refurbishment projects
Identify defects and recommend remedial works
Participate in call‑out rota where applicable
Ensure all works comply with legislation, standards, and best practice
Complete job sheets, service records, and compliance documentation
Follow health & safety procedures, RAMS, and permit‑to‑work systems
Liaise professionally with clients, facilities teams, and managers
Role Criteria:
City & Guilds or NVQ Level 3 in Gas Installation and Maintenance
Valid ACS core qualifications, CCN1, CENWAT
CIGA1, CIGA2, CIGA3, ICPN1, CDGA1
DAH, (desirable)
CHP manufacturer training or certification - Desirable
HIU manufacturer training (e.g. SAV, Heatweb, Danfoss, Altecnic) (desirable)
Strong experience in commercial heating environments
Good understanding of district heating / heat networks
Proven knowledge of CHP and low‑carbon systems
Ability to fault‑find complex heating and control issues
Comfortable working independently and as part of a wider technical team
Flexible and willing to travel across properties and support out‑of‑hours requirements
Full UK driving licence
Benefits we can offer you:
25 days annual leave plus bank holidays
Annual Mears Fun Day - Our annual Fun Day is organised as a massive thank you from the Executive team for all the hard work!
Volunteering Leave - Mears supports employees to undertake paid volunteering in the community, in support of our social value commitment.
Staff perks with Mears Rewards - discounts of up to 10% weekly groceries, holidays, eye test vouchers, Share save scheme, plus much more
Family friendly policies
Company Vehicle and Fuel Card
Access to EAP Counselling sessions
All our roles require candidates to have the entitlement to work within the UK, Mears does not currently offer visa sponsorship.
To drive a Mears vehicle, you must be aged over 21 have held your licence over 3 months and have less than 9 points.
Candidates should be aware that all our roles are subject to relevant Background, Identity & Security checks before commencement of employment.
Apply below or to discuss your application further; contact:
Francesca Swan (francesca.swan@mearsgroup.co.uk) If you need any help with your application process, we are here to support you. We will be accessible every step of the way.
At Mears Grou
Benefits
Health insuranceFlexible schedule
Additional Information
Competitive pay
Expression of Interest - Commercial Gas Engineer
Location: Birmingham
Contract Start Date: 1 July 2026
Contract Type: Full-time, Permanent
Join us on our new, exciting contract with Birmingham City Council
Mears Group has been awarded a major new 10-year partnership with Birmingham City Council to deliver repairs, maintenance, and planned investment work across 11,500 homes in central and west Birmingham. This contract represents one of our most significant projects in the city and will create a wide range of opportunities across our operational teams.
Submitting an expression of interest does not guarantee employment, nor does it provide salary or detailed role information at this stage. It simply ensures that you are first to be contacted when full job details, including pay, working hours, and application timelines, are confirmed.
Mearsgroup · Birmingham, UK