Which fuel oil has a higher viscosity compared to #2 fuel oil?

Fuel oils are classified by their viscosity, which is an important factor in their performance and handling in boiler systems. Viscosity refers to a fluid's resistance to flow; higher viscosity means the fuel is thicker and less fluid.

#2 fuel oil is a relatively light distillate fuel used commonly in residential heating and some industrial applications. When comparing it to heavier fuel oils, #6 fuel oil is a heavier, residual oil that typically has a much higher viscosity than #2 fuel oil.

#6 fuel oil is particularly thick and requires heating to facilitate pumping and atomization in burners, which is crucial for efficient combustion. In contrast, lighter oils like #2 are less viscous and easier to handle.

By understanding the properties of fuel oils, it becomes clear why #6 fuel oil, with its higher viscosity, is appropriately identified as having a greater viscosity compared to #2 fuel oil. This characteristic influences its application, requiring special considerations for storage and transport.