The series ATA200 is a control device for regulating the temperature of solid fuel boilers. The thermostatic control head senses the temperature and through a lever and chain adjusts the position of the air vent, thereby regulating the combustion air supply to the boiler. The draught regulator is fully adjustable within the range of 35–95°C. The draught regulator is connected directly to the boiler waterway through a threaded immersion pocket.