Abstract: A band type heater for mounting on a tubular member and transferring heat to the tubular member comprising an elongated electric resistance heater, a layer of insulating material, and a single piece heat conducting shell. The elongated heater is surrounded by the layer of insulating material and extends along a generally cylindrical curved path. The heat conducting shell is disposed about the elongated heater and insulating material. The heat conducting shell is formed by a thin metal sheet having first and second shell edges wrapped about the heater and insulating material and forming an inner heater face and an outer heater face. The first and second shell edges extend closely adjacent one another along one of the faces.