My electrician used a relay which is controlled by 3 switches at three separate location. One is switched on, I can see the on led displayed on the other two. However, to switch off, have to be at the same switch. Cannot switch off at other location. Not three ways controls. A bit inconvenient but acceptable.
Storage water heater switch, 3 switches at different location
Sep 27 2023, 12:59 PM
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