The presented block is a control device for heating elements of solid fuel boilers, heat accumulators, indirect heating boilers and other equipment using tubular electric heaters as a heating element. Performs a switching function in a wide power range. The operating mode of the unit is provided by a remote capillary thermostat. Depending on the switching capacity, the control units are produced in two versions: on relays and on contactors. The device has compact dimensions, light indication of operation, attractive design, low weight. Wall mounting is allowed.