Commercial Gas Engineer

About the Role

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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.

Duties:

Install, service, and maintain commercial gas appliances and plantDiagnose and repair faults on commercial boilers and associated systemsMaintain and repair commercial gas pipework and valvesCarry out combustion analysis and performance testingEnsure compliance with Gas Safety (Installation & Use) RegulationsComplete commercial gas safety checks and documentationService, maintain, and fault‑find Heating Interface UnitsDiagnose heating and hot water issues relating to HIUsBalance, commission, and pressure‑test HIU systemsLiaise with heat network operators and building management systems (BMS)Carry out HIU replacements and upgrades where requiredCarry out planned maintenance on CHP unitsDiagnose and repair CHP mechanical and control faultsMonitor system efficiency and thermal outputWork with electrical and control specialists where requiredEnsure CHP systems operate safely and efficiently within plant roomsMaintain and fault‑find Air Source Heat Pumps (ASHPs)Understand integration of ASHPs with commercial heating systemsSupport hybrid systems (gas + renewable technologies)Monitor system performance and efficiencyWork safely in commercial plant roomsMaintain pumps, pressurisation units, valves, and expansion vesselsSupport commissioning and refurbishment projectsIdentify defects and recommend remedial worksParticipate in call‑out rota where applicableEnsure all works comply with legislation, standards, and best practiceComplete job sheets, service records, and compliance documentationFollow health & safety procedures, RAMS, and permit‑to‑work systemsLiaise professionally with clients, facilities teams, and managers

Role Criteria:

City & Guilds or NVQ Level 3 in Gas Installation and MaintenanceValid ACS core qualifications, CCN1, CENWATCIGA1, CIGA2, CIGA3, ICPN1, CDGA1DAH, (desirable)CHP manufacturer training or certification – DesirableHIU manufacturer training (e.g. SAV, Heatweb, Danfoss, Altecnic) (desirable)LCL Awards / BPEC – Heat Networks & HIUs (desirable)ASHP qualification (e.g. LCL / City & Guilds / manufacturer training) (desirable)G3 Unvented Hot Water (desirable)Strong experience in commercial heating environmentsGood understanding of district heating / heat networksProven knowledge of CHP and low‑carbon systemsAbility to fault‑find complex heating and control issuesComfortable working independently and as part of a wider technical teamFlexible and willing to travel across properties and support out‑of‑hours requirementsFull UK driving licence

Benefits we can offer you:

25 days annual leave plus bank holidaysAnnual 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 moreFamily friendly policiesCompany Vehicle and Fuel CardAccess 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.