The size of the machine should be based on the number of family members. A family consisting of only one person or a couple can easily meet their needs, with a load of 5 kg. This means that the requirements for washing clothes will not be higher. Machines that have higher requirements for washing clothes need to have a load-bearing capacity of 5-7 kg. They are most suitable for families with one child or three children. However, a machine that can withstand a washing load of 7 kg is suitable for larger families. The rotation speed of the best washing machine is also an important factor, because it determines the speed of washing clothes. The speed is measured in units of revolutions per second. For different clothes, the rotation speed is different.