Plumber / Pipefitter - Data Centre Cooling in Hertford

Plumber & Pipefitter - Cooling Systems & Piping Installation

£50,000 - £55,000 + Benefits | Permanent | Full-time, site-based | Hertfordshire with UK & European travel

We're looking for an experienced Plumber & Pipefitter or Mechanical Engineer to join a delivery team installing, testing and commissioning cooling systems and piping infrastructure in hyperscale and AI data centres.

This is a hands-on, site-based role working from engineering drawings and specifications to deliver critical cooling infrastructure to the highest standards of safety, quality and workmanship. You'll be based out of Hertfordshire and work across project sites in the UK, Portugal, Germany, the Netherlands (Amsterdam) and Norway as projects require. Flights and accommodation are paid, plus a daily allowance of approximately £50.

What You'll Be Doing

• Installing and assembling piping networks for data centre cooling systems to project specifications and drawings
• Fabricating and installing structural supports for pipework
• Supporting the installation and commissioning of Coolant Distribution Units (CDUs) and rear-door heat exchangers
• Interpreting technical drawings, blueprints and specifications to plan installations
• Pressure testing and inspecting installed systems, and finding and fixing leaks and defects
• Assisting with flushing, cleaning and chemical dosing of cooling loops
• Supporting commissioning and client handover, completing test records and documentation accurately
• Working alongside electrical, controls and project teams and coordinating with other trades on site
• Working safely in live, mission-critical environments - following permits, RAMS and client safety requirements

What We're Looking For

• Proven commercial mechanical installation experience, ideally on cooling systems
• Strong pipefitting experience, including assembling piping systems and support structures
• Able to read and interpret engineering drawings, schematics and specifications
• Experience of pressure testing, inspections, fault finding and remedial works
• A relevant mechanical qualification or apprenticeship
• Valid site safety card (CSCS, VCA, SCC or equivalent)
• Full driving licence
• Willing to travel to project sites across the UK and Europe
• Good physical fitness and comfortable working at height and in confined spaces
• Fluent written and spoken English

Desirable

• Data centre or mission-critical experience - hyperscale, colocation or AI projects a bonus
• CDU or rear-door heat exchanger installation/commissioning experience
• Flushing and chemical dosing knowledge
• SSSTS, SMSTS, VCA VOL or equivalent
• An additional European language

What's On Offer

• £50,000 - £55,000 per annum
• Paid flights, accommodation and approx. £50 daily allowance when travelling
• Potential annual performance bonus
• 30 days' annual leave (inclusive of bank holidays), workplace pension and all equipment provided

If you're a skilled pipefitter who wants to work on some of the most advanced data centre cooling projects in Europe, apply now with an up-to-date CV.