NF Group 7-15KW Thin Film High Voltage Coolant Heater

NF GROUP  7 kW–15 kW Thick-Film high voltage coolant heater is a compact, high-efficiency electric heating solution designed for automotive thermal management systems. It converts electrical energy into thermal energy to heat ethylene glycol–based coolant, serving dual functions: cabin climate conditioning and low-temperature battery preconditioning in battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs).

The heater utilizes advanced thick-film heating technology, in which a rare-earth-doped resistive paste is precision screen-printed onto corrosion-resistant stainless steel substrates and then thermally cured to form a durable, adherent heating layer. This process ensures uniform heat distribution, rapid thermal response, and long-term stability under cyclic thermal loading.

Key technical advantages include:

1. Exceptional Energy Efficiency: Thermal conversion efficiency of ≥98.5% is achieved through fully immersed planar heating elements that minimize convective and radiative losses, thereby enhancing system-level energy economy and extending service life.

2. Reduced Operating Temperature and Enhanced Reliability: The maximum surface temperature is limited to ≤170°C, significantly lowering thermal stress on adjacent components and improving long-term operational stability under continuous duty cycles.

3. Inherent Electrical Safety: Hermetically separated electrical and coolant chambers—designed with reinforced dielectric barriers and validated per IEC 60335-1 and ISO 6469-3—eliminate the risks of electrolytic corrosion, condensation-induced tracking, and insulation breakdown.

4. Leak-Tight Construction: The elimination of mechanical vent valves and the adoption of a fully sealed, pressure-rated housing (tested to 5 bar static pressure) ensure robust airtightness and compatibility with closed-loop cooling systems.

5. Simplified Mechanical Architecture: The removal of traditional finned heating plates reduces part count, assembly complexity, and potential fouling points, thereby improving manufacturability and enabling maintenance-free operation.

6. Precision Joining Technology: All critical coolant-path joints are fabricated using automated fiber-laser welding, ensuring zero leakage risk and compliance with ISO 15614-1 welding procedure specifications.

This heater represents a significant advancement in automotive PTC-based thermal systems, setting new benchmarks for power density, functional safety, and integration readiness in next-generation EV architectures.

As a core component of NF GROUP’s thermal management portfolio, the 7–15 kW PTC coolant heater delivers consistent, controllable heating output to support cabin comfort, battery thermal conditioning, and cold-weather drivability without compromising vehicle range or system reliability.

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