The delivery pump is for installations that have multiple pieces of componentry. It’s also perfect for stainless steel installations where there are many 90-degree angles in the plumbing of the system, which causes a reduction of flow in the system. Also, when there is a larger pressure storage tank, like a commercial installation, for proper spring high flow systems in installations. Finally, installations where a more robust output flow from drinking water faucets is desired, like a cafe, food production, commercial kitchen, or filling jugs of water.