HIU Engineer

HIU & Plantroom Engineer
Salary: £42,000 – £46,000 per annum + company van (personal use permitted), fuel card, overtime, and on-call allowance
Location: London and the South (Mobile across client sites)
Applicants must have the existing right to work in the UK; sponsorship is not provided.
Are you a proactive, technically driven HIU & Plantroom Engineer looking to advance your specialist engineering capabilities within a market-leading building services environment?
A Leading Specialist is expanding its operations and seeking a highly skilled HIU & Plantroom Engineer to cover London and the South. This is a pivotal role offering the chance to take full technical ownership of communal heat networks across residential, student accommodation, and commercial portfolios, optimising network efficiency and plantroom lifecycle performance.
The Opportunity:
You will play a vital role in ensuring communal heat networks and central plantrooms operate at peak efficiency and regulatory compliance. Your day-to-day remit involves:

• Servicing, maintaining, fault-finding, and repairing heat interface units (HIUs) across key manufacturers (including Danfoss, SAV, and Evinox), covering plate heat exchangers, actuators, control valves, and heat meters.
  
• Commissioning and setting up new and replacement HIU installations, including system flushing, hydraulic balancing, and return-temperature optimisation.
  
• Executing planned and reactive maintenance across commercial plantrooms, servicing pumps, pressurisation units, buffer vessels, expansion vessels, and associated control systems.
  
• Diagnosing network distribution issues—such as bypass faults, high return temperatures, and low flow rates—while logging accurate digital compliance records and service sheets via mobile job management software.
  The Package:
  
• £42,000 – £46,000 basic salary, fully expensed company van with personal use allowance, fuel card, specialist tooling, PPE, and on-call/overtime enhancements.
  
• Company workplace pension scheme, standard holiday entitlement, and comprehensive employee support.
  
• Funded training programmes (including G3 Unvented Hot Water and manufacturer-accredited HIU courses) with clear internal career progression pathways.
  

Technical Essentials:
To be successful, you must demonstrate high-level technical proficiency:

• Mandatory: NVQ Level 2/3 in Plumbing & Heating (or equivalent recognized trade qualification); G3 Unvented Hot Water certificate held or committed to completing funded certification.
  
• Compliance/Systems: Strong working knowledge of CP1 (Heat Networks Code of Practice), Heat Trust standards, and G3 compliance frameworks; proficient with mobile CAFM/reporting applications. (WRAS, Legionella awareness, or TMV servicing certifications advantageous).
  
• Experience: Proven field track record in commercial plantroom servicing, hydraulic wet heating systems, heating controls, and direct HIU diagnostic/repair work.
  
• Mobility: Full UK Driving Licence with flexibility for mobile regional coverage across London and the South and inclusion on an out-of-hours on-call rota.
  

For more information apply today. Take the next step in your Building Services career with a market leader that prioritises clear communication, technical excellence, and the continuous development of its people.