E-CHEN delivery pumps (also known as demand pumps, dispensing pumps and transfer pumps) are designed for intermittent duty, though most models can be run continuously for hours at a time. Delivery pumps are most commonly used either to pressurize water from an atmospheric tank, to deliver purified water to a specific point of use, or simply to increase water pressure when required.

These diaphragm pumps are controlled by a pressure switch. When required, an integrated bypass can be incorporated to help regulate pressure levels.