In a furnace, _________ eliminates and releases all air from the water into the atmosphere.

The vacuum pump is responsible for extracting air or other gases from the system, creating a negative pressure that facilitates the removal of air from the water or other fluids.
By creating a vacuum, the vacuum pump helps to eliminate air bubbles and dissolved gases from the water in the furnace. This is important because the presence of air and gases can hinder the efficient operation of the furnace and heating system. Air bubbles can impede heat transfer, reduce system efficiency, and potentially cause issues such as corrosion or cavitation.
The vacuum pump works by creating a pressure differential between the furnace system and the surrounding atmosphere. It draws air or gases out of the system, typically through a suction line or inlet. The extracted air or gases are then discharged to the atmosphere or directed to a venting system.