This website points to a recall of specific Delonghi manufactured oil filled heaters.
Follow these 4 steps to determine if your heater is in the recall.

The Faulty Switch That Causes Fires on DeLonghi Oil-Filled Heaters

De’Longhi Manufactured Over 3.5 Million Oil-Filled Radiator-Type Electric Heaters Between 1980 and 1988 That Were later Found To Have A Faulty Switch Which Is Defective and Causes Fires. DeLonghi Oil-Filled Radiator Heaters, known as “The Incredible Heat Machine,” are also known for their Delonghi Heater Faulty Switch that has caused fires in the past. The … Continued

What should you do if you think your heater has been recalled?
CLICK THIS LINK AND FOLLOW THE INSTRUCTIONS ON TO THE UNITED STATES CONSUMER PRODUCT SAFETY COMMISSION WEBSITE.
Click here if you have a recalled heater