A temperature responsive actuator made up of a bellows-like arrangement of bimetal spherical washers which are arranged in pairs with their concave surfaces in opposing relation. One end of the bellows-like arrangement is attached to a frame member and the other end is coupled to a controller rod which extends axially through the center of the bimetal washer arrangement. A heat control means for supplying heat internally of the bimetal washer arrangement is provided which is energized by a control signal from a remotely located temperature sensor element.