Viessmann, a German manufacturer of heating and cooling systems, has issues a voluntary recall for its Vitodens 200-W and Vitodens 222-F series boilers used for space or domestic water heating. According to the recall, the systems have a heat excahnger back plate that can "corrode and leak flue gasses, allowing the boiler to emit excessive amounts of carbon monoxide, posing a CO poisoning hazard to consumers."

There are five affected models in a specific serial number range (see above), and no injuries have been reported so far.

Consumers with recalled boilers should immediately contact their installer or distributor (or Viessmann) to schedule a free in-home safety inspection and repair. Consumers who continue the use of the boilers while awaiting repair, should have a working carbon monoxide alarm installed outside of sleeping areas in the home.

The Vitodens 200-W is a wall hung unit, housed in a white metal box about 38 inches high and 18 inches wide. The Vitodens 222-F is a floor mounted unit, housed in a white metal box about 68 inches tall and 24 inches wide.

The name "Vitodens" is printed on the label on the outside of the boiler box. The product name and model number can be found on the left side of the boiler cover. The serial number can be found on the underside of the wall mounted boiler and on the center section on the floor mount model.

For more information about the recall or for questions, contact the Consumer Product Safety Commission hotline at 800-638-2772.