Air Source Heat Pump Service Engineer

Hometree; Truro (MA); On-site; USD 47,000 - 60,000; Full time

Benefits offered by this job

Company van

Paid travel time

Private medical insurance

Performance incentives

Overtime opportunities

Company pension

28 days holiday

Tools and test equipment

Manufacturer training

Technical team support

Job summary

GreenGenUK, part of the Hometree Group, seeks an experienced Air Source Heat Pump Service Engineer to service and maintain heat pump systems across Devon and Cornwall. You will diagnose faults, perform repairs and optimise performance, while liaising with customers and internal teams to ensure high-quality service.

The role offers a £35,000–£45,000 salary equivalent, 40-hour week, paid travel time, and opportunities for overtime and performance incentives.

Qualifications

• NVQ Level 2 plumbing and heating is required, Level 3 preferred.
• G3 Unvented Hot Water qualification is a must-have.
• Strong knowledge of domestic wet central-heating and hot-water systems.
• Good electrical and controls-based fault-finding ability.
• Ability to interpret manuals, wiring diagrams and system schematics.
• Professional attitude with high-quality workmanship.
• Full UK driving licence.

Responsibilities

• Planned annual servicing of air source heat pump systems.
• Attend breakdowns and investigate reported faults.
• Mechanical, hydraulic, electrical and controls fault finding.
• Repair or replace defective system components.
• Commissioning checks following installations or remedial works.
• Provide customers with practical advice on using their system efficiently.

Skills

Fault finding

Customer communication

Independent worker

Problem solving

Education

NVQ Level 2 plumbing and heating

NVQ Level 3 preferred

G3 Unvented Hot Water qualification

Job description

£35,000–£45,000 Salary Equivalent + Performance Incentives | Company Van | Private Medical Insurance | Paid Travel Time

Location: Ideally located within reasonable travelling distance of Exeter or Helston

Pay: £35,000–£45,000 salary equivalent, depending on experience, based on a 40-hour working week. Performance incentives and overtime provide the opportunity to achieve higher on-target earnings.

Job Type: Full-time

Join One of the South West’s Leading Renewable Heating Teams

GreenGenUK is continuing to expand across Devon and Cornwall, and we are looking for an experienced Air Source Heat Pump Service Engineer to join our growing service and maintenance team.

Established in 2011, GreenGenUK has become one of the South West’s leading renewable‑energy installers and is proud to be part of the Hometree Group. With more than 50 directly employed team members, a substantial installed customer base and continued investment in our people, there has never been a better time to join us.

We install and maintain hundreds of renewable-heating systems each year and now support more than 1,000 heat pump customers. Our reputation has been built on quality workmanship, strong technical knowledge and excellent customer service.

This is a new, full-time position created as our service and maintenance workload continues to grow.

Why Join GreenGenUK?

• South West Renewable Heating Installer of the Year 2025


• Established renewable‑energy business with over 50 employees


• Part of the Hometree Group


• Large and growing heat pump customer base


• Strong pipeline of planned service and maintenance work


• Company van and paid travel time


• Private medical insurance


• Performance incentives and overtime opportunities


• Working‑away opportunities with enhanced rates


• Manufacturer training and support for individual systems


• Support from an experienced in‑house technical team


• Long‑term job security within a growing sector

The Role

You will carry out planned servicing, fault diagnosis, repairs and performance optimisation on domestic air source heat pump systems throughout Devon and Cornwall.

This is primarily a service and maintenance role. You will need to understand and assess the complete heating system rather than considering the heat pump in isolation. This includes the heat pump, heating controls, hot-water cylinder, pumps, valves, emitters, electrical components and system hydraulics.

Your work will include:

• Planned annual servicing of air source heat pump systems


• Attending breakdowns and investigating reported faults


• Mechanical, hydraulic, electrical and controls-based fault finding


• Repairing or replacing defective system components


• Diagnosing poor performance, high energy consumption or comfort issues


• Checking and optimising weather compensation and heating curves


• Reviewing flow temperatures, system pressures, flow rates and temperature differentials


• Inspecting cylinders, pumps, valves, filters, expansion vessels and heating controls


• Completing commissioning checks following installations or remedial works


• Carrying out warranty inspections and manufacturer-authorised remedial work


• Identifying additional repairs and providing clear information for quotations


• Liaising with manufacturers, technical support and our internal operations team


• Explaining system operation clearly to customers


• Providing customers with practical advice on using their system efficiently


• Completing electronic job sheets, photographs, test results and service records


• Maintaining suitable van stock, tools and test equipment


• Supporting installation teams with technical fault finding when required

You will work on systems from manufacturers including Mitsubishi Electric, Vaillant, Samsung and other established heat pump brands.

You do not need previous experience with every system we work on. GreenGenUK will provide manufacturer training and ongoing technical support for individual products and systems.

The role includes paid travel throughout The South West.

What We’re Looking For

We are looking for an experienced and methodical heating engineer who enjoys fault finding and takes pride in resolving problems properly.

You should be confident working independently in customers’ homes while knowing when to seek assistance from manufacturers or GreenGenUK’s wider technical team.

The successful candidate should have:

• Practical experience servicing, commissioning or repairing air source heat pumps


• NVQ Level 2 plumbing and heating qualification as a minimum, with Level 3 preferred


• G3 Unvented Hot Water qualification


• Strong knowledge of domestic wet central-heating and hot-water systems


• Good electrical and controls-based fault-finding ability


• An understanding of system balancing, flow rates and weather compensation


• The ability to interpret technical manuals, wiring diagrams and system schematics


• A logical and methodical approach to diagnosing faults


• Strong customer-facing and communication skills


• The ability to explain technical issues in straightforward language


• Confidence using a mobile phone or tablet to complete service records


• The ability to work independently and manage a field-based workload


• A professional attitude and commitment to high-quality workmanship


• A full UK driving licence

Desirable Experience

The following would be advantageous, although manufacturer and product-specific training will be provided:

• Mitsubishi Ecodan experience or manufacturer training


• Vaillant aroTHERM experience or manufacturer training


• Samsung heat pump experience or manufacturer training


• Experience working with R290 heat pump systems


• A recognised heat pump installation or service qualification


• Electrical qualifications or formal electrical fault-finding training


• Water Regulations qualification


• F-Gas and/or hydrocarbon refrigerant training


• Experience with underfloor heating and multi-zone heating controls


• Familiarity with MCS standards and renewable-heating commissioning documents

What We Offer

• £35,000–£45,000 salary equivalent, depending on experience


• Performance-related incentives offering the opportunity to earn more


• 40-hour working week


• Paid travel time


• Overtime opportunities


• Enhanced rates for working away


• Company van


• Company pension scheme


• Private medical insurance


• 28 days’ holiday including bank holidays


• Company workwear and PPE


• Tools and test equipment


• Manufacturer training and ongoing support for individual systems


• Support from an experienced operations and technical team

Equal Opportunity Employer

At GreenGenUK, we are committed to creating an inclusive and representative working environment. We know that different experiences, perspectives and backgrounds create a better workplace and a stronger business.

We provide equal opportunities throughout our recruitment process and working environment. Employment decisions are based on experience, skills and suitability for the role.

Ready for a New Challenge?

If you are an experienced engineer who enjoys fault finding, takes pride in delivering excellent customer service and wants to develop within the renewable-heating sector, we would love to hear from you.