What type of nozzle should be installed to solve oil viscosity problems?

Using a smaller nozzle is appropriate for addressing oil viscosity problems, particularly when dealing with high-viscosity fuels. When oil becomes more viscous, it flows less easily and can lead to incomplete combustion if the nozzle size is not adjusted. By installing a smaller nozzle, the fuel is introduced into the burner more precisely, allowing for better atomization and improving the combustion process.

This adjustment helps ensure that the right amount of fuel is delivered, enabling the burner to operate efficiently despite the higher viscosity. Smaller nozzles create a finer spray, which is essential for achieving the correct air-to-fuel ratio and reducing emissions, as well as preventing nozzle clogging that can occur with thicker oils.

Other options, such as a larger or standard nozzle, may introduce excessive fuel flow which can exacerbate combustion issues and may not effectively mitigate problems related to oil viscosity. A bypass option isn't relevant in this context because a bypass typically refers to an alternative route for fluid flow and doesn't directly solve viscosity issues.