In an oil heating set up, a deaerator is a crucial component designed to remove air and gases from the fuel oil before it reaches the burner. These air and gas contaminants can negatively impact the combustion process, leading to inefficiencies, increased emissions, and potential damage to the heating system components.

The deaerator typically operates as a vacuum-based system to separate air and gases from the fuel oil. Once separated, the deaerator allows the pure, deaerated fuel to flow through to the burner, ensuring a clean and efficient combustion process.