Overview
Ensure safe, precise water and power control in your water heating system with this high-quality G1/2″ inline water flow switch. Engineered for vertical installation, this flow switch is specifically designed for use in instantaneous (tankless) electric water heaters — controlling water flow and power activation simultaneously — as well as storage-type electric water heaters, where it manages water outlet and power shutoff functions. Its compact, all-plastic construction makes it lightweight, corrosion-resistant, and easy to install in both residential and light commercial applications.
How It Works
This flow switch operates on a magnetic displacement principle, requiring no external power source to detect flow. When water enters the switch body and the flow rate reaches or exceeds 1.0 L/min, the internal magnetic core is physically displaced by the water current. This movement causes the magnetic source to generate a control effect, triggering the switch to output an “ON” signal. This signal is fed into the equipment’s control system, which executes the appropriate control action (e.g., activating a heating element or pump).
When the flow rate drops below the set threshold (0.75–3 L/min range), the magnetic core returns to its resting position, and the switch outputs an “OFF” signal, causing the control system to perform the reverse function — safely shutting off power or stopping the pump. This automatic, flow-driven mechanism provides reliable, responsive protection against dry-fire and low-flow hazards.
Key Features
- Magnetic core sensing – Reliable, mechanical flow detection with no electrical sensing components in the water path
- G1/2″ threaded connection – Standard sizing for easy integration into existing plumbing systems
- Any installation direction – Flexible mounting for tight or unconventional installation spaces
- Wide operating temperature range – Performs reliably from -10°C to 85°C
- High pressure tolerance – Rated up to 300 PSI max working pressure
- Vibration & shock resistant – Rated for 35–500Hz vibration and 30g shock resistance
- Compact, lightweight design – PP plastic body with epoxy resin sealed sensor module
- Flow precision of ±10% – Consistent, repeatable switching performance
Specifications
| Parameter | Value |
|---|---|
| Plunger Material | PP |
| Thread Size | G1/2″ |
| Body Material | PP |
| Wire Gauge | 24AWG |
| Wire Color | Black |
| Filling | Epoxy Resin |
| Switching Current | DC 0.5A / AC 0.5A |
| Switching Voltage | 200VDC / 140VAC |
| Rated Power | 10W |
| Load Current | 1.5A |
| Set Flow Rate | 0.75–3 L/min |
| Flow Precision | ±10% |
| Installation Direction | Any direction |
| Working Pressure | 300 PSI max |
| Vibration Resistance | 35–500Hz |
| Shock Resistance | 30g |
| Operating Temperature | -10°C to 85°C |
| Liquid Medium | Water / Liquid |
Applications
- Instantaneous (tankless) electric water heaters
- Storage-type electric water heaters
- Water dispensers and purification systems
- Solar water heating controllers
- Automatic washing equipment
- Industrial fluid control systems
