1.Electric Commercial Vehicle Electrification Is Accelerating
The global transition toward electric commercial vehicles is creating new requirements for vehicle thermal management. As electric trucks and buses enter more fleet applications, manufacturers must address not only battery performance and driving range, but also cabin comfort, energy consumption and reliable operation under different ambient conditions.
According to the International Energy Agency (IEA), global electric truck sales more than doubled in 2025 compared with 2024, reaching approximately 9% of total truck sales worldwide. China accounted for the majority of this growth, while electric truck sales also increased in Europe and North America. These developments highlight the growing importance of thermal management solutions for electric commercial vehicles.
Source : International Energy Agency (IEA), Global EV Outlook 2026.
Unlike conventional diesel vehicles, battery-electric vehicles generate relatively little waste heat from their propulsion systems that can be used for cabin heating. At low ambient temperatures, batteries may also require temperature conditioning to operate within the limits specified by the battery manufacturer.
Thermal management systems therefore play an important role in electric commercial vehicle design. Depending on the vehicle architecture, the system may need to address several requirements:
For electric buses, delivery trucks, heavy-duty trucks and specialized vehicles, these requirements should be evaluated alongside operating schedules, ambient temperatures and intended duty cycles.
A high-voltage PTC coolant heater is an electric heating component designed to transfer heat to circulating coolant. PTC stands for positive temperature coefficient, describing the characteristic of a heating material whose electrical resistance increases as its temperature rises.
In a liquid-heating system, electrical energy from the vehicle's high-voltage power supply is converted into heat and transferred to the coolant. The heated coolant can then circulate through designated thermal circuits, depending on the vehicle's system design.
This approach allows the heater to support battery heating and cabin heating when the vehicle's thermal architecture is designed for these functions.
1. Direct Coolant Heating
The heater transfers thermal energy into the coolant circuit, enabling heat distribution through compatible heat exchangers and thermal management components.
2. Flexible System Integration
Depending on the product configuration, the heater may be integrated into battery thermal management circuits, cabin heating systems or other approved coolant loops.
3. Compatibility with High-Voltage Vehicle Platforms
Heater voltage, rated power and electrical interfaces can be selected according to the vehicle's electrical architecture and heating requirements.
4. Coordinated Electronic Control
Depending on the design, communication interfaces such as CAN can support integration with the vehicle controller for heating requests, operating status and fault management.
Actual performance depends on heater specifications, coolant properties, circulation rate, heat-exchanger design, control strategy and the overall thermal system. A PTC heater should therefore be evaluated as part of the complete vehicle system rather than as an isolated component.
For vehicle manufacturers, thermal management system integrators and commercial vehicle suppliers, selecting a suitable high-voltage PTC coolant heater requires more than matching a rated power value.
Operating Voltage and Heating Power:
The heater must match the vehicle's high-voltage DC system and required heating capacity. Voltage range, current demand and power-control strategy should be checked during system design.
Coolant Compatibility and Flow Conditions:
Coolant type, inlet temperature, operating pressure, flow rate and pressure drop can influence heat transfer and operating reliability. The heater must be compatible with the specified coolant and circuit conditions.
Control and Communication:
Enable signals, CAN communication, temperature monitoring and fault-handling functions should be evaluated against the vehicle's control architecture.
Installation and Environmental Requirements:
Available installation space, connector arrangement, mounting orientation, vibration exposure, sealing requirements and service accessibility should be considered during integration.
System-Level Efficiency:
Heating demand should be coordinated with battery conditioning, cabin HVAC operation and other available heat sources. Where appropriate, heat pumps and waste-heat recovery can be considered alongside electric heating to help manage overall energy consumption.
The continued electrification of commercial transport is increasing the need for thermal management solutions that can accommodate different vehicle platforms, operating environments and control requirements.
High-voltage PTC coolant heaters provide one approach to meeting heating demands in battery-electric commercial vehicles. Their effectiveness depends on appropriate product selection and integration with the battery, coolant circuit, HVAC system and vehicle controller.
For OEMs and thermal management system integrators, early evaluation of heating capacity, electrical compatibility, coolant performance and control interfaces can help reduce integration risks and support more effective system development.
As electric commercial vehicle applications continue to expand, high-voltage PTC coolant heaters will remain an important component to consider when designing thermal management systems for electric trucks, buses and other specialized vehicles.
When evaluating a PTC coolant heater for a new vehicle platform, manufacturers should confirm the required specifications and operating conditions with the component supplier before finalizing the system design.
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