Viessmann 7822648 Automatic Burner Control Unit by Rexola Biferral RN Type: S4572 A 1004 V02, tested : Amazon.de: DIY & Tools
VIESSMANN KRH Tetramatik 7420 365-H Heating Control Device with Digital Switch, Boiler Sensor and Pedestal, Tested, 100% Functional, Top Condition : Amazon.de: DIY & Tools