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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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Talk to an Expert

Day: April 7, 2026

Grayson Aftermarket Achieves Major Milestone with 1000+ Electric Buses on Servicing Contracts

Aftermarket Grayson

[Birmingham, UK – April 2026] – Grayson Thermal Systems’ Aftermarket division has passed a significant landmark, now delivering servicing and maintenance support for more than 1,000 battery electric and fuel cell electric buses in operation across the UK. Calling upon almost five decades of expertise in the design, manufacture and servicing of HVAC and thermal management systems, […]