The mini water booster has a flow switch and is automatically activated when any faucet is opened, and automatically turns off when the water usage is finished. In addition, with the "continuous operation" option in the terminal box, the pump can be operated without stopping. When the pump is in the automatic operation position, if the flow rate of the water coming into the device is below 0.2 lt / hour, the pump will not be activated. In this way, unnecessary operation of the pump due to minor leaks and drips is prevented. In addition, the device protects itself against dry running.