Mobile Mechanical/HIU Engineer

TN United Kingdom; London; On-site; GBP 45,000 - 50,000; Full time

Job summary

An established industry player is seeking a Mobile Mechanical/HIU Engineer to join their dynamic team. This role offers a competitive salary and the opportunity to work across prestigious commercial sites within Greater London. You will be responsible for maintaining hydraulic heating systems, servicing hot and cold water systems, and ensuring high standards of health and safety. With a structured call-out rota and attractive overtime options, this position promises a rewarding career in a supportive environment. Join a company that values its employees with comprehensive training, benefits, and a commitment to work-life balance.

Benefits

25 days holiday + 8 statutory days

Loyalty bonus after 2 years

Sick pay scheme

Life assurance (2 x basic salary)

Access to private GP services

Employee rewards programme

Comprehensive training and mentoring

Onsite gym and spa facilities

Bring your dog to work initiatives

Qualifications

• Minimum of 3 years experience in a mobile HVAC or building services role.
• Valid UK driving licence and clear DBS record.

Responsibilities

• Maintenance, servicing, and fault finding on hydraulic heating and water systems.
• Setting up and maintaining inverter-driven pumps and associated controls.
• Diagnosis and replacement of pumps, valves, and heat exchangers.

Skills

Hydraulic Heating Systems

Hot and Cold Water Systems

Booster Systems

Inverter-Driven Pumps

Pipework Commissioning

General Knowledge of Gas Appliances

Health and Safety Standards

Job description

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Mobile Mechanical/HIU Engineer
Permanent | London and Surrounding Areas
£45,000 £50,000 basic + approx. £5,000 overtime

About the Opportunity
Valoris Group is working in partnership with an established leader in the building services sector, supporting their search for an experienced Mobile Mechanical/HIU Engineer. This business has operated successfully for over three decades, delivering maintenance and installation solutions across a prestigious commercial portfolio, mainly within Greater London and the M25.

Role Overview
This position is mobile, focused almost entirely within the M25, servicing commercial sites with occasional attendance at a Head Office located in Bishops Stortford. Engineers join a structured call-out rota (approximately 1 week in 7) with standby and enhanced overtime rates available.

Core Responsibilities

Maintenance, servicing, and fault finding on hydraulic heating, hot and cold water, and booster systems.

Setting up and maintaining inverter-driven pumps and associated controls.

Pipework commissioning, balancing, and valve servicing.

Pressure vessel and pressurisation unit installation and maintenance.

HIU servicing and maintenance across a range of systems.

System drain-downs and refills for complete buildings.

Diagnosis and replacement of pumps, valves (modulating and directional), and plate heat exchangers.

Working across central plant rooms, energy centres, and full building distribution networks.

General knowledge of gas appliances, electrical safety, and building management systems.

Strong commitment to health and safety standards on site.

Package and Benefits

Base salary between £45,000 £50,000 depending on experience.

Realistic £5,000 additional earnings through overtime.

25 days holiday + 8 statutory days.

Loyalty bonus following two years of service.

Sick pay scheme and accident insurance.

Life assurance (2 x basic salary).

Access to private GP services and confidential counselling support.

Reimbursement for annual eye care checks.

Employee rewards and recognition programme.

Comprehensive internal training and mentoring schemes.

Access to onsite gym, spa facilities, and regular team events.

Bring your dog to work initiatives (site-based).

Candidate Requirements

Currently residing in the UK with full right to work.

Must live within a commutable distance of Central London.

Valid UK driving licence and clear DBS record.

Minimum of 3 years experience in a mobile HVAC or building services role.

Interested?
Valoris Group is representing this opportunity exclusively. If you are an experienced engineer seeking a career move into a reputable and supportive environment, we would be delighted to hear from you.