HL series is LuckPump’s innovative constant pressure booster pump system specially designed for different water usage habits. The high-low pressure set point function is LuckPump’s new innovation for further energy and water saving. This new control system allows user to set two different constant pressure points, and it will discriminate the different water usage habits and automatically adjust the pressure to high or low level. HL series provides the most optimal and comfortable pressure for users based on their usage habits. The HL series is available with 1-4 pumps.