The Chil-Pak® hydronic circuitry is the “Primary Variable Flow Single Pump Design.” This efficient design is a proven method for attaining higher efficiency than primary and/or secondary central plant systems. Chil-Pak® uses variable speed on both the cooling tower fan and the chilled water pump to achieve maximum energy savings. In this system, the energy that is used is dialed into the actual load that needs cooling to ensure optimal efficiency. This means that the Chil-Pak® design helps to eliminate the expense of the secondary pumps as well as the associated costs which leads to increased financial and energy savings.