March 19, 2007
Alert #07-535


Laars Heating Systems Recalls Gas Boilers and Water Heaters Due to Carbon Monoxide Poisoning Hazard

The following product safety recall was voluntarily conducted by the firm in cooperation with the CPSC. Consumers should stop using recalled products immediately unless otherwise instructed. It is illegal to resell or attempt to resell a recalled consumer product.

Name of Product: Laars 9600 CB Condensing Boilers & 9600 HWG Condensing Water Heaters

Units: About 2,100

Manufacturer: Laars Heating Systems Co., of Rochester, N.H.

Hazard: Internal black plastic venting components in the gas boilers and water heaters can crack and leak flue gases, including carbon monoxide (CO), posing a risk of CO poisoning.

Incidents/Injuries: Laars has received three reports of cracked vent components. No injuries have been reported.

Description: This recall involves Laars 9600 CB Condensing Heating Boilers and Laars 9600 HWG Condensing Water Heaters with black vent pipe/tubing. The recalled boilers are used to generate hot water for heating systems including baseboards or radiant flooring. The recalled water heaters generate hot water for use in homes, such as showers, sinks and dishwashers. "Mark II" and "9600 CB" or "9600 HWG" are printed on the front of the boilers and water heaters. The model number and BTU size are printed on the right side of the unit. The recalled boiler and water heater exteriors are putty and black-colored or taupe and black-colored. Only the following models are included in this recall.


ModelInput (Btu/h)
Gas Boilers:
CB 150 150,000
CB 175 175,000
CB 200 200,000
Water Heaters:
HWG 150 150,000
HWG 175 175,000
HWG 200 200,000

Sold at: Plumbing and heating wholesalers and representatives nationwide from November 1998 through February 2007 for between $6,500 and $7,300.

Manufactured in: United States

Remedy: Consumers should contact Laars Heating Systems to help determine if their boiler or water heater needs to be shut off immediately and to schedule a free repair.

Consumer Contact: Contact Laars Service Department at (800) 900-9276, Extension 4, between 7 a.m. and 4 p.m. PT Monday through Friday, or visit the firm's Web site at

Picture of Front of Recalled Unit
Front of Unit

Picture of Side of Recalled Unit
Side of Unit

Picture of Black Vent Pipe/Tubing on Recalled Unit
Black Vent Pipe/Tubing