Water Treatment Engineer

Build Recruitment Limited; Greater London, Cambridge; On-site; GBP 45,000 - 55,000; Full time

Benefits offered by this job

Company van

Enhanced pension

Private health insurance

Income protection

Death-in-service insurance

Accommodation provided

Holiday & birthday leave

National project exposure

Job summary

Build Recruitment Limited is seeking a Water Treatment & Balancing Engineer for a Cambridge-based role with travel to Oxford, London and the South East. You'll flush, treat, balance and commission heating systems to ensure safe, efficient operation.

You'll work on ground source heat pump projects within the renewable energy sector, with company van, expenses covered and enhanced benefits. Must have experience in water treatment or HVAC commissioning and a full UK driving licence.

Qualifications

• Experience with water treatment or HVAC commissioning.
• Experience with commercial or domestic heating systems.
• Understanding of heating circuits, pumps, valves and flow balancing.
• Knowledge of closed-system water treatment and chemical dosing.
• Ability to interpret water-treatment sampling results.
• Strong reporting and general computer skills.
• Proactive problem-solving and independent workload management.
• Full UK driving licence.

Responsibilities

• Flush, balance and chemically treat closed-loop heating systems.
• Conduct water-quality testing, sampling and analysis.
• Dose inhibitors, glycol and other treatment chemicals.
• Balance heating systems and underfloor circuits.
• Set and commission balancing valves, pumps and flow rates.
• Support commissioning of ground source heat pump systems.
• Record commissioning data and produce reports.
• Prepare RAMS and safety documentation.
• Identify and resolve system performance issues.
• Collaborate with installation, commissioning and project teams.
• Ensure work meets industry standards, health and safety requirements.

Skills

Water treatment

Hydronic balancing

HVAC commissioning

Heating systems

Water quality testing

Documentation & reporting

Problem solving

Driving licence

Job description

Water Treatment & Balancing Engineer

Location: Cambridge, with travel across Oxford, London and the wider South East
Salary: £45,000–£55,000, depending on experience
Package: Company van, enhanced benefits and expenses covered

Our client, a growing specialist contractor within the renewable energy sector, is looking for an experienced Water Treatment & Balancing Engineer.

The company designs and installs ground source heat pump systems across residential, commercial and public-sector developments. This position offers the opportunity to work on innovative low‑carbon heating projects and play a key role in developing the water treatment and balancing function.

The Role

You will be responsible for flushing, treating, balancing and commissioning heating systems to ensure they operate safely and efficiently from installation.

Key responsibilities will include:

• Flushing, cleaning and chemically treating closed‑loop heating systems

• Conducting water‑quality testing, sampling and analysis

• Dosing systems with inhibitors, glycol and other treatment chemicals

• Balancing heating systems and underfloor heating circuits

• Setting and commissioning balancing valves, pumps and flow rates

• Supporting the commissioning and start‑up of ground source heat pump systems

• Recording commissioning data and producing accurate reports

• Preparing RAMS and other relevant safety documentation

• Identifying and resolving system performance issues

• Working closely with installation, commissioning and project teams

• Ensuring work meets industry standards, health and safety requirements and project specifications

About You

The successful candidate will ideally have:

• Previous experience in water treatment, hydronic balancing or HVAC commissioning

• Experience working with commercial or domestic heating systems

• A strong understanding of heating circuits, pumps, valves and flow balancing

• Knowledge of closed‑system water treatment and chemical dosing

• The ability to interpret water‑treatment sampling results

• Strong reporting and general computer skills

• A proactive approach to problem‑solving

• The ability to work independently and manage your own workload

• A full UK driving licence

Experience with ground source or air source heat pumps, BSRIA commissioning procedures or a mechanical/building‑services background would be advantageous. Relevant CSCS, ECS, water‑treatment or commissioning qualifications are also desirable.

Package and Benefits

• £45,000–£55,000 basic salary

• Company van

• Business expenses covered

• Accommodation provided when overnight stays are required

• Enhanced pension scheme

• Private health insurance after six months

• Income protection

• Death‑in‑service insurance

• Holiday allowance including bank holidays, your birthday and additional company days

• Opportunity to work on nationwide renewable‑energy projects

• Scope to develop and grow the department

The role will involve travel across Cambridge, Oxford, London and the wider South East, with occasional UK‑wide travel. Accommodation and relevant expenses will be provided where required.