Which type of pump is typically used above a water source?

A self-assisting centrifugal pump is designed to operate above the water source, utilizing its impeller to create a low-pressure area that draws water up from a reservoir or well. This type of pump works efficiently for applications where the water source is below the pump, and it can handle varying flow rates. Its design allows it to generate enough suction to lift water to the pump, making it particularly suitable for landscape irrigation and other water supply applications.

In contrast, a submersible pump is specifically designed to be placed underwater, where it operates by pushing water to the surface, rather than pulling it. Positive displacement pumps work primarily by moving a fixed amount of fluid per cycle or stroke, suitable for applications requiring high pressure and constant flow, often used for transferring fluids rather than drawing them from depths. Diaphragm pumps also typically serve specific needs for fluid transfer and are not primarily designed for lifting water from below the pump.

Understanding the design and operational principles of these pumps helps clarify why a self-assisting centrifugal pump is the suitable choice for applications where the pump must be located above a water source.