• If you care about seeing the water temperature of your water heater, and the distance between the Sonoff device and the water tank is less than 5 meters, check out the Sonoff TH Elite 20AΒ  or Sonoff TH Origin Β that has to be used with the Sonoff waterproof temperature sensor.
  • If your water heater requires less than 7A, than the Sonoff BASICR2 is a good choice.
  • If your water heater requires between 8A and 17A, and you do not care about monitoring the temperature, than the Sonoff POW Elite is the best choice. As a bonus, you also get to monitor the power used by the water heater.

Note: It is always recommended to use a contactor with Sonoff devices (click here to learn more about contactors and click here to see a video of it in action)