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OTthing

a compact WiFi <-> OpenTherm (master & slave) interface

Project homepage

https://www.seegel-systeme.de/2025/01/05/ot-thing-das-universelle-wifi-opentherm-interface/

schematics

discussion

https://community.home-assistant.io/t/ot-thing-an-opentherm-wifi-gateway-with-integrated-ot-master-slave/824667

Reporting issues

When reporting issues please supply:

Brand & model of boiler & roomunit
Log
status JSON (http://[OTTHING-IP]/status)
configuration JSON (http://[OTTHING-IP]/config)
OT status JSON (http://[OTTHING-IP]/otitems)