VIESSMANN Manufacturer's no. 7450155 control unit S with instruction manual (may not be in English), officially unused, new in open original packaging, was a replacement part : Amazon.de: DIY & Tools
Vitodens 200-W, B2HA/B2HB Gas Boiler | Viessmann US
Amazon.com: Viessmann 7844988 Ignition Cable 5K OHM for Vitodens 100-W B1HA/B1KA Series Boilers : Tools & Home Improvement
Who is the Viessmann Group? | Viessmann US
Vitodens 200-W, B2HA/B2HB Gas Boiler | Viessmann US
Amazon.com: Viessmann: Tools & Home Improvement
Amazon.com: Viessmann 7819967 Sensor #3 (Boiler) for Select Vitodens 100-W/200/200-W Series Boilers and CombiPLUS Kit : Tools & Home Improvement