Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.
💧 Switch to smarter water heating — save energy, save time!
The Keenso EFS-04P Water Switch is a 220V, 3A magnetic flow sensor designed for electric water heaters. Featuring a spring-free magnetic mechanism, it reliably detects water flow to activate heating only when needed, promoting energy efficiency. Its G1/2" BSP threaded design supports both vertical and horizontal installations, while durable plastic construction withstands temperatures from 1°C to 100°C. With a 180-day warranty, this sensor offers a dependable upgrade for modern water heating systems.
| ASIN | B07TYWF668 |
| Best Sellers Rank | 66,097 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 43 in Flow Sensors |
| Brand | Keenso |
| Circuit Type | 1-way |
| Colour | Black |
| Compatible Devices | Electric Water Heater |
| Connectivity Protocol | Wi-Fi |
| Connector Type | Threaded |
| Connector type | Threaded |
| Contact Material | Plastic |
| Contact Type | Normally Open |
| Contact type | Normally Open |
| Control Method | App |
| Controller Type | Mechanical knob |
| Country Of Origin | China |
| Current Rating | 3 Amps |
| Current rating | 3 Amps |
| Customer Reviews | 3.8 out of 5 stars 13 Reviews |
| Lower Temperature Rating | 1 Degrees Celsius |
| Manufacturer | Keenso |
| Manufacturer Part Number | Keenso29bgawvdof |
| Material | Plastic |
| Model Number | EFS-04P |
| Mounting Type | Wall Mount |
| Number of Items | 1 |
| Number of Positions | 1 |
| Operating Voltage | 220 Volts |
| Operating voltage | 220 Volts |
| Operation Mode | ON-OFF |
| Operation mode | ON-OFF |
| Switch Type | Flow Switch |
| Terminal | Screw |
| UPC | 707300318070 |
| Unit Count | 1.0 count |
| Upper Temperature Rating | 100 Degrees Celsius |
| Wattage | 10 watts |
G**.
excellent & great value
excellent & great value
T**E
Not as specified
I used this device to switch a bathroom extractor fan on. Contacts keep sticking leading to continuous running of the fan. Giving the benefit of doubt I replaced my old fan and bought a replacement switch and got the same result. Contacts can be freed by giving the device body a sharp tap , so the contacts are sticking under load conditions.The switch on current of the fan is around 40mA (far less than the specified I max of 3A) Conclusion not as specified.
N**D
Worked fine to 2 weeks
Worked well for about 2 weeks then it became slow to turn on and off. I was using it on the hot water flow to an under sink heater to turn a pressure booster on and off. This was wired via a relay to ensure the switching current was low.
Trustpilot
1 month ago
3 weeks ago