what is differential head
Differential head. We cannot tell you what discharge head a pump will provide unless you tell us the suction head (the head at the pump inlet). Think of a pump as adding head to your system. For example, imagine a pump that adds 20m head. If the head at the pump inlet is 5m then the discharge head will be 25m. The amount of head that the pump adds to the system is called the differential head. So, what we need to know is not what discharge head you require, but how much head would you like the pump to add to your system.