There are many different types of water pumps including positive displacement pumps and centrifugal pumps, which provide the same service, however operate in a different way. The core concept of a water pump is to use a motor to convert rotational energy or kinetic energy and turn it into energy for moving fluid or for fluid flow.Although offering similar applications the main differenced between centrifugal water pumps and positive displacement pumps is that centrifugal pumps can have varying flow depending on the pressure of the type of pump head used compared to positive displacement pumps which can alter flow regardless of the system pressure or the head used.