The THRM ONE is an ESPHome controller for OpenTherm compatible boilers, supporting WiFi, Thread, Zigbee and Ethernet. I'll be releasing the first 50 units near the end of this month, and I'm really looking forward to getting them into your hands.
While I've completed testing of the final units and ensured that they're safe and reliable, there's one part of the equation I have no control over: the boiler. I've tested on a real boiler and ensured that everything is working as expected, but not every manufacturer has stuck as closely to the OpenTherm spec as mine has.
So, I need more data. I have 4 late prototype units that I want to give away, to test on your boiler at home. I've ensured that the THRM ONE is safe and sticks to the specification, and it's time to see if boiler manufacturers have held up their end of the bargain.
If you're interested in giving one a go, let me know in this Reddit thread: