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.

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

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.

ESPHome OpenTherm Thermostat

Brink Renovent HR and Openhab integration

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

OpenTherm compatible hardware based on the ESP8266.

HomeMaster is an open-source platform for local-first smart home automation using ESP32-based devices like MiniPLC and MicroPLC. This repository includes firmware, schematics, and documentation for creating modular, cloud-free automation systems fully compatible with Home Assistant via ESPHome

Blynk OpenTherm Thermostat

OpenTherm decoder for Node-RED

DIYLESS OpenTherm Thermostat Flasher