







💧 Power your flow, save your energy — the smart switch your water heater deserves!
The Keenso EFS-04P Water Switch is a 220V, 10W magnetic water flow sensor designed for electric water heaters. Featuring a spring-free magnet repulsion mechanism, it reliably detects water flow to activate heating only when needed, promoting energy efficiency and reducing scale buildup. With a universal G1/2" BSP pipe thread and durable construction, it supports both vertical and horizontal installation. Backed by a 180-day warranty, it’s a dependable upgrade for modern, energy-conscious homes.




| Manufacturer | Keenso |
| Part number | Keenso29bgawvdof |
| Item Weight | 20 g |
| Item model number | EFS-04P |
| Wattage | 10 watts |
| Item Package Quantity | 1 |
| Switch Type | 1-way |
| Plug profile | Wall Mount |
| Batteries included? | No |
| Batteries Required? | No |
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.
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