Generations of thermal management expertise

About Us

For more than four decades, Grayson Thermal Systems has supported leading manufacturers and operators in the bus and coach, commercial vehicle, rail and specialist off-highway sector with advanced thermal management systems.

From starting as a small Birmingham business, we now have a global footprint in three continents with extensive manufacturing facilities in the UK and USA, alongside our dedicated engineering, research, test and development operations and Aftermarket support network.

Our growing family

We have come a long way since 1978 when chairman, Graham Hateley, opened a humble radiator repair business from a small unit in Hay Mills, Birmingham.

Now, we employ over 300 employees across the world, and have operations across three continents.

Despite our growth, we remain a family-owned business, with three generations of the Hateley family among our growing ranks.

From strength to strength

After becoming an OEM supplier to the public transport industry in 1994, the next 20 years saw us become an established market leader in diesel engine combustion coolers and HVAC systems.

Pre-empting the shift to alternative power sources, we started production of our hybrid vehicle product range in 2005, including electric motor and power electronics cooling modules.

Pioneering zero-emission technologies

A landmark milestone in our journey came in 2014 when we launched our zero-emission range and produced our flagship battery thermal management system (BTMS).

Quickly adopted by OEMs across multiple sectors, our zero-emission thermal management range continues to go from strength to strength. Today, over 70% of our production is for zero-emission vehicles, predominately, battery electric (BEV) and fuel cell electric (FCEV) applications.

We are now a series production supplier for BTMS, HVAC heat pumps, electric motor and hydrogen fuel cell cooling systems, electric water pumps and electric water heaters.

Local service, global reach

From our HQ in the heart of England and office and assembly plants in USA, Czech Republic and Hong Kong, we serve customers around the globe.

Developed to provide optimum performance in any climate, our systems can be found on vehicles across Central to Eastern Europe, USA, Canada, Mexico, Asia Pacific, Australia and New Zealand.

We are a growing organisation and plan a further programme of satellite businesses across the world, alongside a developing global distribution network.

Built on trust

We count some of the best-known OE manufacturers and vehicle operators worldwide among our customers, who trust us to provide reliable systems and exceptional aftersales services.

As a committed partner to our customers, we go above and beyond during the entire lifecycle of our products to offer the support you require.

Learn more about us


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


Looking for more information? From product brochures to detailed technical specifications, all our literature is easily and freely accessible at our Downloads Centre.


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.