Complete Thermal Management Systems (CTMS)

RM-Series

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Products

RM-Series: Smart, All-in-One Thermal Management for Drivers, Passengers, Batteries and Power Electronics

The RM-Series is Grayson’s rooftop-mounted Complete Thermal Management System for single-deck electric buses and coaches. Combining high-capacity reversible heat pump technology, smart heat recovery and intelligent control, the series integrates HVAC, battery thermal management and powertrain cooling into a single rooftop solution optimised for performance and efficiency.

The All-in-One Thermal Control Solution

About Our RM-Series

Developed for BEV and FCEV public transport platforms, the RM-Series delivers full-vehicle thermal management from a rooftop-mounted architecture. Advanced reversible heat pump technology, waste-heat recovery and Grayson’s Intelligent Automatic Controller dynamically balance thermal requirements across cabin, saloon, battery and power electronics circuits. Configurable system design allows OEMs to scale capacity, adapt functions and meet regional requirements without costly vehicle platform redesigns.
Our Capabilities

Configured to Your Specifications

Alongside validated RM-Series catalogue systems, Grayson provides full engineering, software, testing and manufacturing capability to configure or develop bespoke CTMS solutions. Flexible control logic, modular hardware and multiple capacity options enable OEMs to tailor performance, interfaces and compliance requirements while reducing integration risk. Learn More

Contact Us

Discover how the RM-series can simplify your thermal architecture and deliver optimal performance and efficiency.

Discuss your vehicle requirements with our thermal experts to explore RM-Series configurations, control strategies and performance optimisation options.

Enquire About Our RM-Series CTMS

More CTMS Series

Grayson’s CTMS range also includes integrated systems optimised for chassis-mounted installations and double-deck bus applications.

Discover More About Grayson

For more than 40 years, Grayson Thermal Systems has delivered dependable heating and cooling solutions to vehicle sectors worldwide. Our experience and technical capability help ensure efficient, long-term system operation.