OTGateway

Open-source OpenTherm gateway firmware turning any compatible boiler into a smart thermostat.

Desktopfreeglobal

OTGateway is open-source ESP32/ESP8266 firmware that connects to an OpenTherm-compatible boiler and adds smart heating control, including PID and solar-curve heating modes, external sensor support, freeze-protection failsafes, and MQTT/Home Assistant integration. It's meant to turn a standard boiler into an automated, energy-saving smart heating system. It's aimed at home automation hobbyists managing their own heating.

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