What is a potential risk associated with burning oil that is not properly atomized?

When oil is not properly atomized during combustion, multiple risks can arise, making "all of the above" the most comprehensive choice.

Insufficient heat production occurs because improperly atomized oil does not mix well with air, leading to incomplete combustion. This means that not all of the fuel is being burned effectively, resulting in lower heat output.

Increased emissions are another critical issue. Incomplete combustion often produces higher levels of pollutants, including carbon monoxide and unburned hydrocarbons. This not only impacts air quality but can also violate environmental regulations.

Finally, combustion chamber damage is a significant risk, as the uneven burning of the oil can lead to excessive heat in localized areas, causing stress and potential deterioration of the materials in the combustion chamber.

Thus, each of these risks highlights the importance of proper atomization in ensuring efficient and safe oil burner operation.