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Novel electrical heater which are self-regulating as a result of appropriate combination of a constant current or constant voltage power source with a resistive heating component and a temperature-sensitive component. Preferred heaters comprise a plurality of heating units, each of which heating uni

Novel electrical heater which are self-regulating as a result of appropriate combination of a constant current or constant voltage power source with a resistive heating component and a temperature-sensitive component. Preferred heaters comprise a plurality of heating units, each of which heating units comprises a reactive component, a resistive heating component, and a temperature-responsive component. Self-regulation of the heater may be achieved in a number of different ways, including the use of employing a reactive component and a temperature-responsive component which form a combination exhibiting an impedance which changes with temperature. The temperature-responsive component can for example change in dielectric constant, or in permeability or in shape, or can effect changes in the frequencies inputted to the reactive component.

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An electrical heater which comprises (A) two connection means which are connectable to an AC power supply; and (B) a plurality of discrete, spaced-apart, heating units, each of said heater units comprising (a) a reactive component; (b) a resistive heating component which generates heat when the conn

An electrical heater which comprises (A) two connection means which are connectable to an AC power supply; and (B) a plurality of discrete, spaced-apart, heating units, each of said heater units comprising (a) a reactive component; (b) a resistive heating component which generates heat when the connection means are connected to a suitable AC power supply; and (c) a temperature responsive component which has a property which varies with temperature so that, when the heater is connected to a suitable AC power supply, the heat generated by the heating unit decreases substantially as the temperature of the unit approaches an elevated temperature; said reactive component, when it is an inductor and is the same as the temperature-responsive component, being connected to the connection means by discrete electrical conductors.