When should the boiler vent be closed?

The boiler vent should be closed when the boiler is shut down to maintain safety and efficiency. Closing the vent during a shutdown helps to prevent the entry of outside air and contaminants into the system. It also prevents heat loss, which can save energy and aid in maintaining the boiler’s operating conditions for when it is restarted.

During a boiler shutdown, it is essential to create a sealed environment to avoid potential hazards, such as rust formation or corrosion inside the boiler due to exposure to humid air. Additionally, proper venting must be adhered to during startup, troubleshooting, and normal operation to ensure safety and effective functioning of the boiler system. These activities often require open vents to ensure adequate airflow and safe combustion conditions, making them unsuitable times to close the vent.