The U.S. Consumer Product Safety Commission, in cooperation with Wal-Mart Stores, Inc., today announced a voluntary recall of the Flow Pro, Airtech, Aloha Breeze and Comfort Essentials space heaters. The heaters can malfunction, resulting in overheating, smoking, burning, melting and fire. This recall involves 2.2 million units sold at Wal-Mart stores nationwide from December 2001 through October 2009 for about $18.

Wal-Mart has received 21 reports of incidents involving the heaters, which included 11 reports of property damage beyond the heater. Injuries were reported in four incidents, three of which required medical attention for minor burns and smoke inhalation. The remaining incidents included smoke irritation, sparking or property damage beyond the heater.

The recall involves Flow Pro, Airtech, Aloha Breeze and Comfort Essentials 1500 watt heaters. The heaters are gray with a metal handle on the top with vents and gray control knobs on the front. The model number is 1013 and can be found on a label on the lower left corner of the back panel of the heater.

Consumers should immediately stop using the recalled heater and return the product to any Wal-Mart store for a full refund. For additional information, contact Wal-Mart toll-free at (800) 925-6278 between 7 a.m. and 9 p.m. CT Monday through Friday, or visit the firm’s website at www.walmart.com.