PTC Thermistors for Liquid Heating

PTC thermistors for liquid heating are particularly suitable for high-end products requiring high safety and longevity. PTCs offer excellent performance as liquid insulation components. Compared to conventional electric wire heaters, PTC thermistors for liquid heating eliminate the need for a temperature control system and are also cost-effective.
The heating power of a PTC thermistor for liquid heating varies depending on the operating conditions. To maximize the PTC’s heat dissipation power, the heated liquid should have good circulation or convection. The power density (heating power/water contact area) of a submersible heater is approximately 6W/cm² (at a water temperature of 25°C). The power density (heating power/water contact area) of a fluid heater is approximately 4-10W/cm² (at a water temperature of 25°C). Higher water temperatures reduce heating power.
The higher the dry-burning temperature of a PTC liquid thermostat heater, the greater the heating power it generates. To achieve a relatively low-cost solution, PTC liquid thermostat heaters are generally designed for a dry-burning temperature of 220-280°C. If the dry-burn temperature is required to be lowered, the volume or number of PTC liquid thermostat heaters must be increased accordingly to achieve equivalent power.

Submersible Liquid Heater PTC Appearance and Structure

Advantages of PTC instant liquid electric heater

PTC Application Design for Fluid Liquid Heaters

Submersible Liquid Heater PTC Application Design

Submersible Liquid Heater PTC Application Design

This submersible liquid heater is inserted into a liquid container to heat the liquid to a constant temperature. Using a PTC element as the heat source, it offers fast heating, constant temperature heating, self-adjusting power, high heat conversion efficiency, strong anti-scaling properties, and resistance to damage even in dry-burn conditions. It is widely used in various electric heating appliances in the home appliance industry.

Submersible PTC Liquid Heater Technical Specifications

Operating Voltage: 12-240V
Insulation Withstand Voltage: >3750V, through special insulation treatment, safe and reliable
Surface Temperature: 100-250° C.
Rated Power: 50-500W
Power Density: (Heating Power/Water Contact Area) Approximately 6W/cm² (at 25°C)

Single-Sided PTC Heating (Inner Hole Diameter 13mm)
Double-Sided PTC Heating (Inner Hole Diameter 20mm)

Instantaneous PTC Liquid Heating Heater External Structure
Advantages of Instantaneous PTC Liquid Heating Heaters

1. High Safety Factor Due to Water-Electricity Separation: When the heating element is unloaded or the temperature control fails, the PTC resistance rapidly increases until the power drops to less than 100W, eliminating the risk of dry heating.
2. Rapid Heating: Instantly heats, with hot water available within 10 seconds. This eliminates heat waste and conserves energy. 3. Compact size and light weight make it suitable for developing ultra-thin electric water heaters, keeping pace with the trend.
4. No open flame, no scaling, and long life.
5. Strong voltage adaptability: The PTC fully adapts to voltage fluctuations within 25% of the rated voltage, without affecting power.

Main parameters of the instantaneous small kitchen heater heating tank

Main parameters of the heating tank of instant electric water heater