The type and level of control varies considerably.
Limited Manual Controls. Basic log burning stoves generally control the rate of burn and hence the heat output via a manually operated shutter on the fresh air supply vent. Wood logs are simply placed into the burning chamber. When heat is no longer required, no further fuel is added and the fire burns out naturally.
Electronic Controls. Pellet stoves use electronic controls to closely control all aspects of the stove operation. These include automatic on-off timing, air ratios, output, thermostatic and automatic shut-down in the event of unstable operation. A room temperature sensor is normally mounted on the stove to enable room temperature control.
Remote Control. Many pellet stoves now offer remote control units in order that the main functions can be activated from anywhere in the room, e.g. output & on-off operation. Some manufacturers offer the ability to control basic functions such a on-off and temperature settings using text messages from a mobile phone.