The electric heaters are formed by a glass fabric tape, in which a multi-wire nickel-chrome resistance is inserted, covered by a polyester adhesive tape reinforced with glass fiber filaments and by a further external glass fiber braid. The heaters are typically used during the winding, before the impregnation process, in order to avoid the formation of water or condensation in electric motors that work in critical environments. The operating temperature can vary from class F 155°C to class H 180°C.