Where is the water flow sensor of the booster pump of the air energy water heater?

Intake pipe. The sensor of the booster pump is on the intake pipe near the throttle valve, and most of them are black plastic shells. The plug has 3 or 4 wires (3 wires without temperature measurement and 4 wires with temperature measurement). Sensor is a kind of detection device that can sense the measured information, and can convert the sensed information into electrical signals or other required forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control.