When the hot water faucet is turned on, if the water flow icon is activated, the sensor is working correctly. Efficient hot water solution for RVs This water heater flow sensor is designed specifically for the Girard Tankless Water Heater GSWH-2, providing a reliable and efficient solution for your hot water needs. With advanced electronics and components, this sensor ensures a continuous supply of hot water, making it an essential part of your mobile lifestyle EXTEND HEATER LIFE: Replace old/damaged water flow sensors to extend the life of your tankless water heater and ensure proper operation of your hot water system. Water Sensors Water Flow Sensor For Girard GSWH-2 Tankless Water Heater GSWH-2 Replacement Part Girard Tankless Hot Water Heater RV #GSWH-2 Includes Black Door & Cont Water Flow Meter NOTE: To confirm whether the water flow sensor is connected, check the water flow icon (a shower head symbol) on the UCP. This Lippert Components Water Heater Flow Sensor is compatible with Girard Tankless Water Heater GSWH-2 FUNCTION: The control board adjusts the heater output based on the water flow data provided by the water flow sensor to compensate for variations in water temperature. FUNCTION: Water flow sensor measures the actual water flow and transmits the data to the control board.