The market for electric vehicles in the U.S. is rising, with record sales reported in the second quarter of 2023. This has resulted in a need for more efficient vehicle components, such as the ones used in modern heating and cooling systems. That is why KUS now offers components for energy-efficient vehicles, including our positive temperature coefficient (PTC) heating units. Here’s what you need to know about PTC heaters and their role in thermal management systems.

What Is a PTC Heater?

PTC heaters operate on the principle that the electrical resistance of the heater increases as the heater’s temperature increases. The result is a self-regulating heating system. Unlike traditional heating elements that might require external thermostats or regulators, PTC heaters automatically adjust their heat output based on ambient temperature, this increases performance and reduces risks of potential thermal events.

One of the standout benefits of using PTC heaters over traditional heating elements is their efficiency. These systems can generate more heat while using less energy. By conserving energy, these heaters offer tangible benefits for electric vehicles, such as increased cruising ranges.

Comparing PTC Coolant Heaters and PTC Air Heaters

While PTC heaters have gained popularity in the automotive industry, it’s important to understand that different types are designed for specific applications. Two of the most commonly used types are PTC coolant heaters and PTC air heaters.

positive-temperature-coefficient-ptc-heating-unitPTC Coolant Heaters

PTC coolant heaters are designed to heat a vehicle’s coolant. It primarily serves as a channel with a heating element to help maintain the vehicle’s battery at an optimal temperature. For this reason, they serve as an essential component for electric applications, especially during colder months. Maintaining the correct temperature for the battery ensures longevity and maximizes the vehicle’s performance.

Product image ptc-air-heating-unit-integratedPTC Air Heaters

As the name suggests, PTC air heaters focus on heating air directly. They are often used with a vehicle’s HVAC system to ensure the interior remains comfortable for passengers. In many modern vehicles, PTC air heaters have replaced the traditional heater core used in older models. PTC air heaters provide immediate warmth since they don’t rely on a secondary medium like coolant. This direct method can offer more rapid temperature changes in the cabin, enhancing passenger comfort, and help to decrease additional leak path potentials.

The Role of PTC Heaters in Alternative Energy Vehicles

KUS heaters feature impressive designs that help them serve in various applications. Our heaters stand out for several reasons, including:

  • In-vehicle air conditioning. Air conditioning systems are necessary in modern vehicles, and PTC heaters ensure that the in-vehicle A/C systems are up to the mark.
  • Battery thermal management. Batteries, especially those in electric vehicles, need to operate within a specific temperature range to ensure longevity and efficiency. PTC heaters help maintain this optimal temperature, especially during colder months.
  • Hydrogen fuel cell cold starts. Starting a new energy vehicle in cold conditions can be challenging, especially if it’s a fuel-cell vehicle. PTC heaters assist in these cold starts, ensuring the vehicle operates smoothly regardless of the external temperature.

PTC Heater Benefits and FAQs

KUS PTC heaters offer several advantages over traditional heating elements. However, many are unfamiliar with these benefits. Here are some of the most common questions we receive about our PTC heater products.

What is the benefit of the PTC heating element?

The main benefits are energy efficiency, precise temperature control, and compact size. PTC heaters self-regulate their heat output based on conditions, maximizing efficiency.

How efficient is a PTC heater?

PTC heaters are very efficient. They generate more heat using less energy compared to traditional heating elements, thanks to their automated, self-regulating design.

What is the maximum temperature for a PTC heater?

PTC heaters can typically heat up to around 572°F (300°C) efficiently. The maximum temperature depends on the specific heater’s design and specifications.

Are PTC heaters cheaper to run?

Yes, PTC heaters are generally cheaper to operate. Their energy efficient design means they use less electricity to produce heat. This saves on energy costs compared to less efficient heating methods.

What size are KUS PTC heaters?

With the push toward more compact vehicles, every inch of space counts. KUS PTC heaters feature compact designs without compromising efficiency. At the same time, we offer multiple PTC heater products that meet the needs of a wide variety of applications.

PTC Heater Models and Specifications

From Electric Automotive vehicles to Material Handling and Industrial/Commercial platforms, KUS PTC heaters can be used in a wide range of applications. Review our popular PTC heater models in the chart below.

KUS PTC Water (Coolant) Heater Models

Model Rated Voltage Rated Power Rated Condition Dimension (L*W*H) Customized Pressure Drop
NPH10A 80V 3kW Flow rate: 10L/min

Coolant temp: 32°F/0℃
182*136*112 10kPa
NPL20 350V 5kW Flow rate: 10L/min

Coolant temp: 140°F/60℃
182*136*110 5.5kPA
NPH30A 600V 7kW Flow rate: 10L/min

Coolant temp: 32°F/0℃
221*136*110 20kPa
NPH30C 600V 7kW Flow rate: 25L/min

Coolant temp: 32°F/0℃
321*170*128 14.7kPa
NPH40 600V 10kW Flow rate: 10L/min

Coolant temp: 32°F/0℃
255*299*104 3kPa
NPH50 600V 15kW Flow rate: 25L/min

Coolant temp: 32°F/0℃
255*229*104 8.6kPa
NPK40 800V 10kW Flow rate: 12L/min

Coolant temp: 140°F/60℃
255*247*104 3kPA
NWL40 350V 4kW Flow rate: 12L/min

Coolant temp: 68°F/20℃
153*191*88 3kPa
NWH80 800V 8kW Flow rate: 12L/min

Coolant temp: 68°F/20℃
200*237*88 5kPa


KUS PTC Air Heater Models

Model Rated Voltage Rated Power Rated Condition Dimension (L*W*H mm) Weight
Air Heater (Integrated Type) 800V 10kW Inlet air temp: 77°F/25℃

Air speed: 7m/s

370*260*108 6.5kg
Air Heater (Split Type) 600V 5kW Inlet air temp: 77°F/25℃

Air speed: 4.5m/s

250*280*32 3.0kg
Air Heater (Integrated Type) 600V 5kW Inlet air temp: 77°F/25℃

Air speed: 4.5m/s

317*180*108 3.7kg
Air Heater (Split Type) 350V 5kW Inlet air temp: 77°F/25℃

Air speed: 4.5m/s

250*280*32 2.8kg
Air Heater (Integrated Type) 48V 4kW Inlet air temp: 77°F/25℃

Air speed: 4.5m/s

227*167*98 3.1kg
Air Heater (Integrated Type) 350V 3kW Inlet air temp: 77°F/25℃

Air speed: 4.5m/s

305*180*108 3.1kg
Heat Pump Air Conditioning Auxiliary Heater 12V 1kW Inlet air temp: 77°F/25℃

Air speed: 4.5m/s

27*93*30 0.7kg

For more information, visit our PTC heaters product page.

Explore More New Energy Products From KUS

PTC heaters will play an increasingly important role in vehicles moving forward. With their efficiency, safety features, and adaptability, they are set to redefine vehicle heating systems.

At KUS, we’re ready to meet the changing demands of the automotive industry. With our range of PTC heaters and other new energy products built and tested in-house, we’re your trusted partner for a large selection of marine, vehicle, and industrial applications. Contact us today to speak with an expert on our team to learn more about how our products can meet your project needs.

Contact Us by Email