I had bought an Opentherm Gateway which was sold as a daughter board for an Orange Pi. It sat unused for a few months. Recently I tested it out and it works fine. But I don't think I will use it in the short term because my boiler is not natively OT compatible any way.

Included :
1. OTGW board already installed
2. Orange Pi (boxed)
3. Brand new in box accessory board (the OTGW board replaced this in the enclosure)
4. Orange Pi enclosure (boxed)
5. SD card pre-installed with OT Monitor on Armbian Bionic

PM me for details