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An electrical heater which includes a fabric prepared from electrodes and an elongate resistive heating element which is composed of a conductive polymer, preferably a PTC conductive polymer, to render the heater self-regulating. The fabric is laminated to, and preferably embedded in, a sheet of an

An electrical heater which includes a fabric prepared from electrodes and an elongate resistive heating element which is composed of a conductive polymer, preferably a PTC conductive polymer, to render the heater self-regulating. The fabric is laminated to, and preferably embedded in, a sheet of an insulating polymer, particularly a non-tracking insulating polymer.

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An electrical sheet heater which comprises (1) a fabric comprising a plurality of elongate elements which are interlaced together in an ordered array, said elongate elements comprising (a) a plurality of first electrodes which are substantially parallel to each other, and which are electrically conn

An electrical sheet heater which comprises (1) a fabric comprising a plurality of elongate elements which are interlaced together in an ordered array, said elongate elements comprising (a) a plurality of first electrodes which are substantially parallel to each other, and which are electrically connected to each other; (b) a plurality of second electrodes which are substantially parallel to each other and to the first electrodes, which are electrically connected to each other, and which are spaced apart from the first electrodes; and (c) a plurality of resistive heating elements which are composed of a conductive polymer, which are substantially parallel to each other and at an angle to the electrodes, and through which current passes when the first and second electrodes are connected to a power source; (2) means for connecting the first electrodes and second electrodes to a power source; and (3) a laminar matrix which is composed of an electrically insulating material comprising an organic polymer and within which said fabric (1) is embedded.