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Powertrain and People HVAC
Integrated thermal management and HVAC
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Complete Thermal
Management Systems
All-in-one battery, power electronics, and cabin HVAC systems
Chassis-mounted complete thermal management
Double-deck bus complete thermal management
Rooftop-mounted complete thermal management
Driver and Passenger HVAC
HVAC solutions for climate comfort
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Cabin HVAC
Reliable cabin heating and air conditioning
Demisters for windscreen defogging
Rooftop air-conditioning systems
Heating
Fast-response cabin and floor heaters
Cabin heating modules
Floor heating modules
Heat Pump
Ultra-efficient reversible heat pumps
Driver cabin heat pump systems
Hot liquid heat pump systems
Powertrain Thermal Management
Thermal control of batteries, engines, motors and electronics
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Battery Thermal Management Systems
Advanced battery heating and cooling to life and performance
Mobile battery thermal management systems
Stationary battery thermal management systems
Rail battery thermal management systems
Coolers
Liquid-cooled radiator modules for BEV, ICE & FCEV
Power electronics and traction motor cooling systems
Hydrogen fuel cell cooling systems
Internal combustion engine cooling systems
Thermal System Components
Robust core components for thermal systems
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Auxiliary Heaters
Electric water heaters for clean, instant coolant heating
PTC and resistive electric water heaters.
HMI Controller
User-friendly HMI control panels for drivers
Climate control HMI panels
Electric Water Pump
Stable coolant flow for precise heating and cooling
Canned motor electric water pumps
Magnetic drive electric water pumps
Sensor
Precision sensors for intelligent thermal system monitoring
Temperature sensors for thermal monitoring
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About Us
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Generations of Thermal Management Expertise
Efficient cabin & saloon comfort & visibility for drivers, operators and passengers.
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Our Mission, Vision & Values
Capabilities
Leadership Team
Careers
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Services
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Supporting your business is our business
Efficient cabin & saloon comfort & visibility for drivers, operators and passengers.
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Services & Maintenance
Ensure your vehicle’s HVAC and cooling systems continue to provide optimum performance.
Aftermarket Parts & Products
Reliability is essential for vehicle OEMs and operators to minimise downtime.
Technical Support
We know how important it is for you to be able to quickly get an answer to a technical query.
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Sectors We Serve
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Thermal management experts in your sector
Efficient cabin & saloon comfort & visibility for drivers, operators and passengers.
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Bus & Coach
Comfort and performance across all routes
Commercial Vehicle
Thermal performance for every mile
Defence
Mission-critical thermal management
Off Highway
Helping OEMs break new ground
Rail
Helping to keep rolling stock rolling
Special Vehicle
Built for every unique application
Stationary Power
Keeping power systems performing
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Career Opportunities

About Us
Careers

Grow with us

If you are looking for an ambitious organisation that values its people and provides you with an opportunity to grow and succeed in the expanding world of zero-emission vehicles, then we want to hear from you.

We pride ourselves on not only developing innovative solutions to help deliver a greener future but also developing our dedicated and diverse team of people. From competitive salaries to exciting career progression, we work hard to ensure the well-being and satisfaction of our talented and empowered workforce.

We are always looking for talented and motivated individuals to join us on our journey. If you are interested in joining us, register your CV and contact details with our HR department by emailing employment@graysonts.com today.

See our vacancies:

Office Manager

The Office Manager is responsible for the efficient day-to-day running of the Graysons office, ensuring administrative processes, facilities management, people administration and operational support activities are delivered effectively.
Location: Wharfdale House, 257 Wharfdale Rd, Birmingham B11 2DP
Full-time
View Job

Office Manager

Full-time
Location: Wharfdale House, 257 Wharfdale Rd, Birmingham B11 2DP
The Office Manager is responsible for the efficient day-to-day running of the Graysons office, ensuring administrative processes, facilities management, people administration and operational support activities are delivered effectively.
The role will act as a central point of coordination across departments, supporting managers and employees while maintaining robust systems, records and reporting. The Office Manager will provide leadership to administrative staff, oversee office procedures and ensure the business operates smoothly, professionally and in line with company standards.

Job Overview

The position acts as a critical link between Engineering and Manufacturing, ensuring that build issues, quality concerns, assembly challenges, and design improvements are identified during prototype activities and effectively communicated, documented, and resolved. The role also supports the development of manufacturing processes, standard operating procedures (SOPs), build documentation, and lessons learned to ensure successful transition from prototype to production. The Prototype Build & Development Technician will support internal development activities, design reviews, vehicle commissioning, root cause investigations, customer demonstrations, and field-based engineering support as required. FOR MORE INFORMATION PLEASE SEE AND APPLY FOR THE JOB ROLE ON LINKEDIN: https://www.linkedin.com/jobs/view/4487284216/

Responsibilities

  • Manage the day-to-day operation of the office and administrative functions.
  • Develop, implement and maintain office procedures and processes to improve efficiency.
  • Ensure company records, documentation and filing systems are accurate and up to date.
  • Coordinate office facilities, equipment maintenance and supplier relationships.
  • Manage office consumables and stationery budgets.
  • Organise meetings, prepare agendas and record actions where required.
  • Coordinate travel and accommodation bookings for employees.
  • Operational Support
  • People Management & Support
  • Compliance & Business Support
  • Financial & Commercial Administration

Experience

  • Previous experience in an Office Manager, Administration Manager or similar role.
  • Strong organisational and planning skills.
  • Excellent communication and interpersonal abilities.
  • Experience producing reports, trackers and management information.
  • Good understanding of HR administration processes.
  • Strong IT skills, including Microsoft Office (Excel, Word, Outlook and Teams).
  • Knowledge of health and safety and compliance administration.
  • Experience managing small teams.
  • Understanding of KPI reporting and continuous improvement activities.

Our offer to you

    Apply Now

    To apply, please email your CV, along with the name of the position you are applying for, to employment@graysonts.com.

    Prototype Build & Development Specialist

    The Prototype Build & Development Specialist is primarily responsible for the assembly of engineering prototypes for test and development and 1st off units for customer trial.
    Full-time
    View Job

    Prototype Build & Development Specialist

    Full-time
    The Prototype Build & Development Specialist is primarily responsible for the assembly of engineering prototypes for test and development and 1st off units for customer trial.
    The Prototype Build & Development Specialist is primarily responsible for the assembly of engineering prototypes for test and development and 1st off units for customer trial. The units will primarily be used for evaluation and may be made up of a base unit that needs significant modification to represent the required state for testing. Support of vehicle builds and tests may also be required throughout the product development lifecycle. Working closely with Mechanical, Electrical, Software, Systems, and Manufacturing Engineers, the role provides practical hands-on support during prototype builds, testing, validation activities, and field trials.

    Job Overview

    The position acts as a critical link between Engineering and Manufacturing, ensuring that build issues, quality concerns, assembly challenges, and design improvements are identified during prototype activities and effectively communicated, documented, and resolved. The role also supports the development of manufacturing processes, standard operating procedures (SOPs), build documentation, and lessons learned to ensure successful transition from prototype to production. The Prototype Build & Development Technician will support internal development activities, design reviews, vehicle commissioning, root cause investigations, customer demonstrations, and field-based engineering support as required.

    Responsibilities

    • Build engineering prototype systems, vehicles, and development hardware to engineering drawings, models, schematics, and specifications.
    • Support assembly of HVAC systems, cooling systems, battery thermal management systems, electrical systems, controls hardware, and development test rigs.
    • Install and modify prototype equipment, instrumentation, wiring, pipework, brackets, and associated assemblies.
    • Carry out rework, modification, and improvement activities as designs evolve.
    • Ensure prototype builds are completed safely, accurately, and to agreed programme timing.
    • Work alongside Design Engineers throughout prototype build activities.
    • Identify assembly issues, design concerns, manufacturability challenges, and serviceability risks.
    • Liaise with Manufacturing Engineering to ensure prototype build learning is captured.
    • Support creation and validation of build processes, work instructions, SOPs, and assembly documentation.
    • Design Review & Continuous Improvement
    • Field Support & Vehicle Validation
    • Health, Safety & Workshop Management

    Experience

    • Experience working within an engineering workshop, prototype build, development, test, or manufacturing environment.
    • Strong practical mechanical and electrical assembly skills.
    • Experience interpreting engineering drawings, schematics, and assembly instructions.
    • Experience building mechanical, electrical, or vehicle-based systems.
    • Good understanding of manufacturing and assembly processes.
    • Experience identifying and resolving practical build issues.
    • Strong fault-finding and troubleshooting skills.
    • Ability to work effectively across engineering and manufacturing teams.
    • Ideally qualified to HNC/HND level (or equivalent) in Mechanical Engineering, Electrical Engineering, Automotive Engineering, Manufacturing Engineering, or a related discipline.
    • Training or experience in prototype assembly and engineering development activities.
    • Experience using workshop equipment, fabrication tools, and measurement equipment.

    Our offer to you

      Apply Now

      To apply, please email your CV, along with the name of the position you are applying for, to employment@graysonts.com.

      Electrical Design Engineer

      You will contribute to all aspects of electrical system design within the engineering team, supporting concept development, prototype builds, and release of electrical designs into production.
      Full-time
      View Job

      Electrical Design Engineer

      Full-time
      You will contribute to all aspects of electrical system design within the engineering team, supporting concept development, prototype builds, and release of electrical designs into production.
      hile the role covers the full breadth of electrical design activities, you will focus on the design, integration, and documentation of electrical systems used within our vehicle thermal management solutions. As a key contributor to electrical system delivery, you will support best practices in power distribution, protection strategies, grounding, wiring and harness design, and system integration. You will support other engineers by reviewing electrical aspects of their designs, contributing to technical decision‑making, and ensuring designs meet performance, safety, and reliability requirements. You will work closely with mechanical engineers, software and controls engineers, manufacturing, procurement, and suppliers to ensure electrical system designs are practical, robust, serviceable, and aligned with production capability. During prototype builds, you will work hands‑on with technicians to support installation, commissioning, fault‑finding, and issue resolution. Following testing and validation activities, you will ensure designs are updated, documented, and ready for smooth transition into serial production. This is an office‑ and workshop‑based role requiring a professional electrical engineer with strong system‑level understanding and a practical approach to engineering delivery.

      Job Overview

      FOR MORE DETAILS AND TO APPLY THROUGH LINKEDIN: https://www.linkedin.com/jobs/view/4480989360/

      Responsibilities

      • Produce electrical schematics, wiring diagrams, harness layouts, and electrical bills of materials (BOMs) to support release into production
      • Design and define vehicle‑ and system‑level electrical architectures, including power distribution, fusing and protection, grounding strategies, and cable / harness routing
      • Specify electrical components such as cables, connectors, contactors, relays, sensors, and actuators
      • Ensure electrical designs are suitable for environmental conditions, vibration, thermal exposure, service access, and manufacturability
      • Work closely with mechanical design engineers to ensure electrical routing, mounting, and protection are incorporated early in the design process
      • Support prototype builds, commissioning, troubleshooting, and fault diagnosis activities
      • Assist in the preparation and execution of Design Verification Plans (DVPs) for electrical systems
      • Prepare and maintain electrical design documentation, including schematics, harness drawings, installation information, and technical notes
      • Collaborate with multidisciplinary engineering teams to ensure successful integration of electrical systems within overall product designs
      • Liaise with suppliers and contractors to specify and source electrical components and resolve technical issues
      • Participate in design reviews and contribute to continuous improvement activities

      Experience

      • Proficiency in electrical CAD tools (e.g. SolidWorks Electrical, EPLAN, or equivalent)
      • Minimum of 2–3 years’ experience in an electrical engineering or electrical design role
      • Experience within manufacturing, automotive, rail, off‑highway, or similar vehicle / equipment sectors desirable
      • Strong understanding of: Electrical power distribution and protection, Wiring and harness design, Electrical installation best practice
      • Experience supporting prototype builds and production release
      • Familiarity with CAN / LIN networks from an electrical wiring and integration perspective
      • High attention to detail in design and documentation
      • Experience using ERP / MRP systems for BOM creation and management

      Our offer to you

        Apply Now

        To apply, please email your CV, along with the name of the position you are applying for, to employment@graysonts.com.

        Controls Engineer

        The Software & Controls Engineer is responsible for the specification, development, verification, validation, and support of embedded software and control systems used in thermal management products for commercial vehicles, off-highway equipment, and zero-emission vehicle applications.
        Full-time
        View Job

        Controls Engineer

        Full-time
        The Software & Controls Engineer is responsible for the specification, development, verification, validation, and support of embedded software and control systems used in thermal management products for commercial vehicles, off-highway equipment, and zero-emission vehicle applications.
        The role includes the development of control strategies for HVAC, Battery Thermal Management Systems (BTMS), cooling systems, heat pumps, and auxiliary vehicle systems, ensuring compliance with customer, regulatory, and internal requirements. The engineer will work closely with systems engineering, electrical engineering, product engineering, test & validation teams, and customers throughout the product lifecycle. TO APPLY THROUGH LINKEDIN AND TO SEE MORE INFORMATION: https://www.linkedin.com/jobs/view/4482059241/

        Job Overview

        Requirements & System Definition Capture and analyse customer and system requirements. Develop software requirements specifications. Support system architecture development. Generate requirements traceability matrices. Support FMEA and functional safety activities where applicable. Define control strategies and operating modes. Design and develop embedded control software. Develop Stateflow/Simulink models and auto-coded solutions where appropriate. Configure and develop software for electronic control units (ECUs). Develop diagnostics and fault management strategies. Implement CAN communications and vehicle interfaces. Apply coding standards and software quality processes. Develop software verification plans. Produce Software Design Verification Plans (DVPs). Support Hardware-in-the-Loop (HIL) and Software-in-the-Loop (SIL) testing. Support climatic chamber testing and vehicle validation activities. Investigate software-related failures and field issues. Analyse test results and produce validation reports. Support production launch activities. Troubleshoot vehicle and customer issues. Support root cause investigations. Implement corrective and preventive actions. Support aftermarket and service engineering where software updates are required. Support software development process improvement. Contribute to engineering standards and best practices. Support cybersecurity and software quality initiatives. Mentor junior engineers where required.

        Responsibilities

        • Capture and analyse customer and system requirements.
        • Develop software requirements specifications.
        • Support system architecture development.
        • Generate requirements traceability matrices.
        • Design and develop embedded control software.
        • Develop Stateflow/Simulink models and auto-coded solutions where appropriate.
        • Develop software verification plans.
        • Produce Software Design Verification Plans (DVPs).
        • Support production launch activities.

        Experience

        • Degree in Control Engineering, Electrical Engineering, Electronics Engineering, Software Engineering or related discipline or similar.
        • Experience developing embedded software for automotive or commercial vehicle applications.
        • Experience with CAN-based vehicle systems.
        • Control algorithms development (PID, Hysteresis, MPC).
        • Thermal system control strategies.
        • MATLAB / Simulink.
        • Stateflow.
        • Embedded C++.

        Our offer to you

          Apply Now

          To apply, please email your CV, along with the name of the position you are applying for, to employment@graysonts.com.

          1978 – 2026

          48 years of growth

          Interested in joining Grayson Thermal Systems? Learn more about us, from our humble beginnings in the heart of England to our global expansion and innovative product developments.

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          Products

          We work with you to provide thermal management solutions that meet your needs, no matter what the application. Discover our product ranges today.

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          Sectors

          From innovative electric-powered and hydrogen-powered buses to retrofit solutions for off-highway applications, we have the experience and expertise to meet the needs of your application.

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