Is it important to preheat the spout before making coffee by hand?

Sometimes you see baristas making hand-brewed coffee with a small detail: they pour some water into the cup before brewing the coffee. What is the point of this step?

When making hand-brewed coffee, we pour water into the cup to preheat the spout and the neck of the hand-brewed coffee.

What is the difference between preheating and non-preheating temperature?

In fact, different hand-made coffee POTS have more or less an impact on the flavor of coffee boiled out. After all, the radian and length of the neck of the pot can affect the point and temperature of the water column.

If the arc of the neck of the pot is too steep, it is not good to judge the falling point of the water column at the beginning, which is easy to cause the water column to directly break through the powder wall and the water flows away from the edge of the filter paper cup. When the neck of the pot is relatively slow, the water column is easy to be large or small. However, whether the neck is steep or slow, controlling the flow of water is a more important factor, so that other types of POTS can be used more easily.