Challenger Supply Holdings (Fort Worth, Texas), in cooperation with the U.S. Consumer Product Safety Commission and Health Canada, is recalling about 29,000 tankless gas water heaters in the U.S. and 2200 units in Canada. The water heaters can overheat, posing a fire hazard. The manufacturer is Daesung Celtic Enersys Co. Ltd. of Chungbuk, South Korea.

The recall involves all models of single- and dual-purpose Coaire and Quietside brand tankless water heaters. The recalled heaters heat either 4 or 7.2 gallons of water a minute. They are white and come in the following dimension ranges: 25 to 28 inches tall by 15 to 19 inches wide and 8 to 14 inches thick. The words “S-Line Condensing” are on the top front, and brand names Coaire or Quietside are on the bottom front of the recalled heaters.

Daesung has received 40 reports of the units overheating, including four involving burns on the wall where the heater was mounted and two involving fires and property damage. No injuries have been reported. Consumers should immediately stop using the recalled heaters and contact Challenger Supply Holdings to arrange for a free repair. The heaters were sold by independent dealers nationwide on various websites, including Amazon.com, from July 2008 through August 2014 for between $500 and $2000.

For more information, contact Challenger Supply Holdings at 800/729-6118 between 7 a.m. and 6 p.m. CST Monday through Friday, or go online at www.challengersupply.com and click on “Product Recall.”