ERO-300 controls the temperature of the inflown air and the air in a room, in which the control panel is installed. Depending on these two values, the controller regulates rotations of a motor in a way that heats the air in rooms to the amount set by a user. Furthermore, ERO-300 protects a fan against a damage by turning on a motor when the temperature exceeds 145 °C. It is signalized by a sound signal as an alarm (regardless of whether a fan is on or off). In the mode of operation, the 'temperature controller' enables the stabilization of temperature in a room in the scope of 10% to 100% maximum KOM fan's rotations. In the mode of work, the temperature controller enables the stabilization of temperature in a room in the scope of 8°C to 30°C by the smooth regulation of the warm air inflow.