Abstract: A thermally regulating heater and a heated seat made using these heaters wherein the resulting heated seat provides enhanced temperature control without the need of any temperature control system. The heaters include the use of a polymeric positive temperature coefficient composition that operates at lower trip temperatures than previous polymeric positive temperature coefficient compositions. The polymeric positive temperature coefficient composition have a trip temperature below the heat deflection temperature of the composition such that the polymeric positive temperature coefficient composition heats the heated seat to a temperature closer to the comfort level of an individual using the heated seat. Since the polymeric positive temperature coefficient composition uses plastic materials, the polymeric positive temperature coefficient composition can be formed into different shapes as needed using a molding process, such as injection molding.