Firefighters from Lostwithiel and Bodmin were called to a property in Tredethick Lane, Lostwithiel, early yesterday (April 9).
A fire was reported as out but still smoking.
Crews confirmed the fire had been caused by an electric heater, but was out. They used a positive pressure ventilation fan to clear smoke from the building.
The Lostwithiel station answered a second 999 call later the same day to a car fire at the top of Penpillick Hill, which was found to be out on their arrival.