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.

A Winter Warning About Defective DeLonghi Heaters

Because of DeLonghi’s Defective Heaters, This Winter, Please Review If You Have a Model That Could Explode Winter is nearly here, which is when people start using portable electric heaters to keep themselves warm. This blog is to let you determine whether or not you may be using one of the oil-filled DeLonghi Defective Heaters … 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