Abstract: A carpet seaming iron comprising a sole plate, an ultra thin guide strut and a flat planar heater core comprising heating ribbon arranged in three separate patterns for providing high, medium and low heat to the front, middle and rear sections of the sole plate. A thermostat is provided with an auxiliary heater controlled by a switch for controlling the power applied to the heater core so as to selectively provide a high and low temperature in each of the heat zones. A heat insulator on the heater core and a heat shield on the top of the iron base keeps temperatures below that which melt carpet backing, e.g. 300.degree. F. Indicating lights are provided for indicating when power is applied to the iron and when power is applied to the heater core. The ultra thin guide strut restricts the extent to which the edges of a pair of carpet halves are separated during the seaming process for providing easier operation and a better seam between the carpet halves.