An instantaneous heating device for solid, liquid, gas and vapors

14) A heating device, comprising:

• a heater (2) made of a material the electrical resistance of which is variable according to a temperature;
• a power source (1,10) in alternating current, connected to the heater (2) by means of electrical connections (8,9) for sending an electric current which flows through the heater (2);
• a control module (4) predisposed for adjusting the current supplied by the power source (1);
• measuring connections (6,7) located at the ends of the heater (2) and connected to the control module (4), which control module (4) is predisposed for measuring the resistance of the heater (2) by calculating a ratio between the voltage present at the heater ends (2) and the current flowing through the heater (2), which are detected by means of the measuring connections (6,7);
• characterised in that it comprises:
• a direct current source (12), predisposed for supplying a predetermined current;
• a capacitor (13), connected in parallel to the direct current source (12);
• the capacitor (13) and the source of direct current are interposed between the power source (10) and the heater (2);
• a low-pass filter (14) located in parallel to the heater (2) and connected to the control module (4).