Shelly 1PM Gen4 water heater kit with water temperature sensor

Wiring the Shelly 1PM Gen4 to a water heater

Why heat the whole tank if the water is already hot?

In most homes, the water heater runs on a timer without knowing the water temperature. On sunny days that means unnecessary heating, and on cloudy days it’s sometimes not enough. The probe in the kit measures the actual water temperature, and the relay runs the water heater only when it’s needed.

What you can do with the kit

• Temperature-based scene: for example, turn the water heater on only if the water is below 40 °C, and turn it off automatically when it reaches 55 °C.
• Remote control: turn it on, turn it off and schedule it from the app, from anywhere.
• Consumption tracking: how long the water heater ran and how much it cost, in real time.
• Alerts: for faults, excess consumption or disconnection.
• Shabbat timer: fixed timers and an astronomical clock.

What’s new in Gen4

The Shelly 1PM Gen4 supports Zigbee, Matter and Wi-Fi 6, so it fits into any smart home system, and it has Bluetooth for external sensors and quick setup in the app.

Installation

The relay installs behind your existing water heater switch, and the probe attaches to the water heater next to the thermostat. We recommend having a licensed electrician do the installation. After installation, connect the device to the app (available in Hebrew) and set up the scene.