ESPHome firmware for the Sitron Labs SLHA00045 module, a smart Wi-Fi module for controlling electric heaters through Home Assistant using the French fil pilote (pilot wire) system.
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This module turns any fixed electric heater compatible with the French pilot wire (fil pilote) system into a smart, connected device. It mounts directly onto the heater's junction box, replacing the existing cover, and lets your home automation system control heating and monitor room temperature and humidity.
On power-up, and after any power loss, the module defaults to frost protection to avoid unwanted heating and protect the installation.
This product is designed for the French market, where the pilot wire system is used.
ESPHome is an open source framework that turns microcontrollers into smart home devices through simple configuration files. It integrates natively with Home Assistant and also works with any system that supports its API, making it easy to add and maintain custom devices on your network.
- Based on an ESP32-C6 microcontroller with Wi-Fi
- Pilot wire (fil pilote) control: comfort and frost protection modes
- AHT20 temperature and humidity sensor
- Green LED heating indicator
- Native Home Assistant integration over the ESPHome API
- Over-the-air (OTA) firmware updates
- Easy Wi-Fi setup via ESPHome Improv or captive portal
- Automatic frost protection on power-up
- Open firmware and schematic
Warning
This module works with 230 V AC mains voltage. Installation must be performed exclusively by persons with the necessary electrical qualifications. Always disconnect power and verify the absence of voltage before working on the installation. This module has no certification; use at your own risk.
The module screws onto the heater's junction box in place of the existing cover (you can reuse the existing cover's screws). Two wires come into the board from the mains: live and neutral. Three wires go out to the heater: live and neutral are passed through, and the module adds the pilot wire (fil pilote) signal it generates.
On first power-up, you need to provide the device with your Wi-Fi credentials. This step is called provisioning, and can be done in several ways:
- Bluetooth (BLE) via Home Assistant — If your Home Assistant instance has Bluetooth, the device should appear automatically on the Integrations page. Follow the wizard to enter your Wi-Fi credentials.
- USB (serial) via the ESPHome web interface — Connect the device to your computer with a USB cable, open web.esphome.io and click Connect, then select the device (usually shown as USB JTAG/serial debug unit). From the device menu (…), choose Configure Wi-Fi → Connect to Wi-Fi, select your network and enter the password.
- Fallback access point (captive portal) — When the device can't connect to a Wi-Fi network, it starts a fallback hotspot whose name begins with
SLHA00045. Connect to it and follow the captive portal to configure Wi-Fi. If the portal doesn't open automatically, browse to http://192.168.4.1/.
Once connected to your network, the module is auto-discovered by Home Assistant as an ESPHome device, where it appears as a thermostat (heat / off) and a temperature and humidity sensor.
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