BUDERUS Logamatic R 4121 Heater Controller with Modules FM441 FM 441 and FM452 / FM456 with MEC 2 or B MEC2 Controller, 1 Piece Sensor and Handbook Unused/New : Amazon.de: DIY & Tools
BUDERUS Logamatic R 4126 S 32 Verp Heating Controller with MEC 2 Controller, Plug and User Manual : Amazon.com.be: Tools & Home Improvement
Buderus KM271 WiFi Replacement (PCB only) from Moles Store on Tindie