Arduino/ESP8266/ESP32 OpenTherm Library for HVAC system control communication

OTGateway is a powerful open-source solution for controlling OpenTherm-compatible boilers, turning your heating system into a smart one. Set the perfect temperature, save on energy bills, and eliminate unnecessary hassle — integration with Home Assistant makes heating management simple and automated.

Example of how to control an opentherm boiler with esphome

Create your own smart modulating thermostat using the OpenTherm component for ESPHome

OpenTherm library to create thermostat for OpenTherm enabled boilers and HVACs using an OpenTherm controller and an ESP32 or other microcontroller

Home Assistant OpenTherm Thermostat

ESP32 OpenTherm Wi-Fi Thermostat

A library to interface with the OpenTherm Gateway through serial or network connection.

ESP8266/ESP32 OpenTherm controller

OpenTherm gateway

This component reads and displays the boiler status values from a rooted Toon thermostat.

OpenThermGateway2MQTT

The implementation of OpenTherm communication protocol for ESP8266 with NodeMCU firmware. Written on LUA language. Inspired by Ihor Melnyk https://github.com/ihormelnyk/opentherm_library

Brink Renovent HR and Openhab integration

OpenTherm compatible hardware based on the ESP8266.

ESPHome OpenTherm Thermostat

OpenTherm decoder for Node-RED

Blynk OpenTherm Thermostat

DIYLESS OpenTherm Thermostat Flasher

Simple opentherm thermostat domoticz integation sample