EFS-04P Magnetic Water Flow Switch for Instant Water Heater
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Prices updated: 14 Oct 2026
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About this product
EFS-04P is a plastic magnetic water flow switch for instantaneous electric water heaters. When water flows through it the switch closes so heating starts, and when the flow stops heating stops. It uses magnet repulsion instead of springs, with a permanent-magnet filter to catch impurities.
Specifications
- Type
- Magnetic water flow switch
- Body material
- Plastic
- Actuation
- Magnet repulsion (no spring)
- Application
- Instantaneous electric water heater
- Filter
- Permanent-magnet impurity filter
Frequently asked questions
What does this switch do in a water heater?
It detects water flow and switches the heating circuit on when water flows and off when the flow stops, so the heater does not run without water moving through it.
What are its electrical ratings and connections?
The listing does not state electrical ratings or terminal details. Check the markings on the unit or the manufacturer's data before connecting it to mains power.
