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Features

• DHW temperature control
• Heating temperature control
• Smart heating temperature control modes:
  • PID
  • Equithermic curves - adjusts the temperature based on indoor and outdoor temperatures
• Hysteresis setting (for accurate maintenance of room temperature)
• Ability to connect additional (external) sensors: Dallas (1-wire), NTC 10k, Bluetooth (BLE). Makes it possible to monitor indoor and outdoor temperatures, temperatures on pipes/heat exchangers/etc.
• Emergency mode. In any dangerous situation (loss of connection with Wifi, MQTT, sensors, etc) it will not let you and your home freeze.
• Ability of remote fault reset (not with all boilers)
• Diagnostics:
  • Displaying gateway status
  • Displaying the connection status to the boiler via OpenTherm
  • Displaying the fault status and fault code
  • Displaying the diagnostic status & diagnostic code
  • Display of the process of heating: works/does not work
  • Display of burner (flame) status: on/off
  • Display of burner modulation level in percent
  • Display of pressure in the heating system
  • Display of current temperature of the heat carrier
  • Display of return temperature of the heat carrier
  • Display of setpoint heat carrier temperature (useful when using PID or Equitherm)
  • Display of the process of DHW: working/not working
  • Display of current DHW temperature
  • And other information...
• Home Assistant integration via MQTT. The ability to create any automation for the boiler!

Documentation

All available information and instructions can be found in the wiki:

• Home
  • Quick Start
  • Build firmware
  • Flashing via Web Flasher
  • Flashing via ESP Flash Download Tool
  • Settings
    • External temperature sensors
    • Other external sensors
    • Reporting indoor/outdoor temperature from any Home Assistant sensor
    • Reporting outdoor temperature from Home Assistant weather integration
    • DHW meter
    • Advanced Settings
  • Equitherm mode
    • Ratios
    • Fit coefficients
  • PID mode
  • Logs and debug
• Compatibility
  • Boilers
  • Boards
  • Temperature sensors
• FAQ & Troubleshooting
• OT adapters
  • Adapters on sale
  • DIY
    • Files for production
    • Connection
    • Leds on board

Gratitude

• To the developers of the libraries used: OpenTherm Library, ESP8266Scheduler, ArduinoJson, NimBLE-Arduino, ArduinoMqttClient, ESPTelnet, FileData, GyverPID, GyverBlinker, OneWireNg & OneWire
• To the PlatformIO Team
• To the team and contributors of the pioarduino project
• To the BrowserStack team. This project is tested with BrowserStack.
• To the PVS-Studio - static analyzer for C, C++, C#, and Java code.
• And of course to the contributors for their contribution to the development of the project!