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Wiring and technical diagrams

Connecting a Shelly Plus 1 to a water heater

May 31, 20221 min read

Previous model. This guide was written for the Shelly Plus 1, which has been replaced by the Shelly 1 Gen4. The wiring is the same, and the settings are in the same places in the Shelly Smart Control app. Go to the Shelly 1 Gen4 →

Wiring diagram

Wiring diagram of a Shelly Plus 1 relay connected to an electric water heater, including live, neutral and a wall switch

Legend

  • Setup:
  • Water heater control settings: in the app, tap the device you want to configure > Settings > Settings:
  • All done 🙂

Settings in the app

1

Power On Default Mode: choose Restore Last Mode.

2

Device Type: choose Water Heater, or the matching load type.

3

Button Type:

  • With a standard toggle switch: choose Edge Switch.
  • With a push button (spring-return switch): choose Momentary.

How to choose "Edge" in the new app, with screenshots: The full guide →

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