The series CTF150 is typically used for on/off control of circulation pumps and load units. The flue gas thermostat consists of a temperature probe connected to the switch unit. The switch is used to control the electrical supply to a circulation pump or a load unit with an integrated circulation pump. The temperature probe can be mounted on the outside of the flue gas pipe, or inside the pipe using the immersion pocket series CTF851. The switch unit is prepared for easy wall mounting.