Water flow mainly consists of valve body, rotor assembly and Hall Current Sensor installed in the hot water inlet end for detecting water flow. When water through the flow rotor assembly, rotor will rotate and Speed will change as the flow change. Hall Current sensor output corresponding Signal and controller, then the controller will control the flow. Features: weight, easy to install Suitable type electric water heater and water-storage type electric water heaters' water power control When water flows within the flow switch, and water flow ≥1.0L / min, the the flow switch driven by the push of water starts to move; the core's displacement causes effect and makes flow switch output "ON" signal. The signal inputs device control system, the control system finishes control action; when the water flow is less than the beginning flow, the flow switch output "OFF" signal.  The control system will generate control action. Water flow - ON; No water Specification: The lowest rated working voltage: DC 5V-24V Maximum operating current: 0.5A Maximum load current: 1.0A Maximum load power: 10W Maximum contact resistance: &; Maximum switch voltage: 110V DC Minimum collapse voltage: 220V DC flow: ≤1.0 L / min Working Flow Range: 1-25L / min Start pressure: ≤0.1Mpa Max. pressure: 2.0Mpa Min. pressure: ≤1.75Mpa Work temperature: 1- 120 ℃ Ambient temperature: -40~150℃ Span: 180 times (switching cycle) Work humidity range: 35%~90%RH (no frost) Allowing pressure: pressure 1.75Mpa Storage temperature: -25~+80 ° c Save humidity: 25%～95%RH Response/Release time: 0.2s Dimension(): Approx. 53mm*22mm/2.09x0.87inch Cable length: Approx. 35cm/13.78inch Input/Output Screw Diameter: Approx. 20mm/0.79inch Color: Black Package Includes: 1 x Water flow Switch