The so-called head refers to the required head, not the lifting height. It is particularly important to know this point when choosing a water pump. The pump lift is approximately 1.15 to 1.20 times the lifting height. For example, the vertical height from a water source to the place where the water is used is 20 meters, and the required lift is about 23 to 24 meters.
When choosing a water pump, the head on the nameplate of the water pump should be close to the required head. Generally, the deviation should not exceed 20%. In this case, the pump has the highest efficiency, is more energy-saving, and will be more economical to use. If the lift on the nameplate is much smaller than the required lift, the pump often cannot meet the needs of the user. Even if the water can be pumped, the amount of water is pitifully small. But conversely, when a high-head water pump is used for a low-head, the flow will be too large, causing the motor to overload. If the motor temperature rises for a long time, the winding insulation layer will gradually age and even burn the motor.
