What is the ideal air-to-fuel ratio for efficient combustion in an oil burner?

The ideal air-to-fuel ratio for efficient combustion in an oil burner is around 15:1. This ratio allows for optimal mixing of air and fuel, ensuring that enough oxygen is present to completely combust the fuel while minimizing excess air that can lead to heat loss through the flue gases.

At the 15:1 ratio, combustion is more efficient, resulting in better heat output and less unburned fuel. This efficiency also helps in reducing emissions, as it leads to a more complete combustion process, which lowers the production of harmful byproducts like carbon monoxide and soot.

The other ratios do not provide the same balance of air to fuel; for example, a 10:1 ratio would indicate that there is not enough air for efficient combustion, potentially causing incomplete burning and increased emissions. Meanwhile, the higher ratios, such as 20:1 and 25:1, imply an excess of air, which can reduce the temperature of the flame and lead to inefficiencies, as some of the energy produced is lost in heating up the excess air rather than used for effective heating. Thus, 15:1 is recognized as the optimal ratio for achieving a stable and efficient combustion process in oil burners.