U.S. Boiler Company Recalls Gas-Fired Hot Water Residential Boilers Due to Carbon Monoxide Poisoning Hazard

The blocked vent switch (BVS) can fail to shut down the burners if the boilers are installed at altitudes above 5,400 feet and the vent system becomes blocked. In such an event, the boiler can emit excessive amounts of carbon monoxide into the home, posing a carbon monoxide (CO) poisoning hazard to consumers.