The U.S. Consumer Products Safety Commission announced a voluntary recall of Bosch Thermotechnology gas boilers due to a carbon monoxide poison hazard.

About 85 gas boilers made in Germany for Bosch Thermotechnology Corp. of Londonderry, N.H., could have ignition problems due to a lack of sufficient voltage from the boiler's transformer, the commission said in a statement. As a result, the boiler's venting system could be compromised.

The recall involves Buderus GB312 gas-fired condensing boilers that stand 60 inches high and between 39 and 55 inches wide. BUDERUS GB312 is printed on the side of the recalled boilers.

The boilers were sold to contractors nationwide from April 2008 through February 2009 for between $12,000 and $24,000 installed, the commission said.

Bosch Thermotechnology is contacting or has contacted consumers to make repairs to the boilers.

Consumers can call 800-283-3787 for information.