NF Group PTC Coolant Heater 24V~750V PTC Electric Coolant Heater CAN Control EV Liquid Heater OEM HVCH

A key element in the thermal regulation architecture of electric vehicles is the HVCH, which essentially acts as a smart and secure electric boiler. It raises the temperature of the antifreeze coolant to provide a steady and dependable heat supply for warming the passenger compartment and maintaining the traction battery at its optimal operating temperature. The water‑type PTC heater now dominates the market, favored for its strong safety profile, substantial heat‑retention ability, and effortless integration with vehicle air‑conditioning units.

PTC Coolant Heater Working Principle

At the heart of this device lies a PTC (Positive Temperature Coefficient) ceramic thermistor. Its functioning depends on a distinctive resistance‑versus‑temperature behavior: when cold, the electrical resistance is minimal, permitting a large current to flow and quickly produce heat—ideal for cold‑start conditions. Conversely, as the temperature climbs, the resistance surges, which automatically reduces the current and power draw. This inherent self‑regulation allows the heater to hold a safe temperature level without needing elaborate control loops, effectively removing any danger of overheating.

PTC Electric Coolant Heater Construction and Design

The basic construction includes a PTC heating core (made up of ceramic plates, electrodes, and insulating layers), an aluminum heat exchanger with passages for the coolant, an electronic controller that interprets commands from the vehicle to modulate the output, and both high‑ and low‑voltage interfaces. A vital safety measure is the complete physical segregation of the electric heating elements from the coolant circuit—so that no energized component ever comes into contact with the liquid. This design rules out electrical leakage and short circuits, complying with the strict high‑voltage safety requirements of the automotive industry.

PTC heater Major Benefits

The device offers multiple strengths: First, outstanding safety and dependability—thanks to both the physical isolation and the self‑limiting nature, there is no risk of flame or excessive heat, plus built‑in safeguards against voltage spikes, current surges, overheating, and running dry. Second, impressive energy efficiency—up to 85 % of electrical input is converted into usable heat, and the smart controller adjusts output in real time to match demand, minimizing waste. Third, rapid warm‑up capability, even in freezing conditions. Fourth, fine temperature regulation, with accuracy down to ±2 °C. Fifth, extended durability—the robust PTC ceramics are oxidation‑resistant and rated for a service life of 8 years.

EV Liquid Heater Typical Uses

The heater is widely employed for: (a) passenger compartment warming—where the hot coolant circulates through the cabin heater core; (b) battery conditioning—raising the pack’s temperature prior to charging or driving to boost efficiency and range; and (c) ancillary needs such as fuel‑cell pre‑warming and windshield defrosting.

Founded in 1993, Hebei Nanfeng Automobile Equipment (Group) Co., Ltd. operates as a conglomerate with six production bases. We are a leading provider of NEV parts in China and an approved vendor for the country’s military vehicles. Our portfolio covers high‑voltage coolant heaters, electric water pumps, BTMS, electric air compressors, EPS, EHPS, electric A/C compressors, three‑way valves, parking heaters, parking A/C units, plate heat exchangers, and other related products.

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