COMPATIBILITY: Water Flow Sensor compatible with Girard GSWH-2 Tankless Water Heater EXTEND HEATER LIFE: Replace old or damaged water flow sensors to extend the life of your tankless water heater and ensure proper operation of your hot water system FUNCTION: Water flow sensor measures the actual water flow and transmits the data to the control board. The flow rate is determined by changes in frequency 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 NOTE: To confirm whether the water flow sensor is connected, check the water flow icon (a shower head symbol) on the UCP. When the hot water faucet is turned on, if the water flow icon is activated, the sensor is working correctly COLOR: Copper Color MATERIAL: Copper PACKAGE CONTENTS: 1 x Water Flow Sensor Only the above package content is included; other products are not included Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement may vary by +/- 1-3 cm