Viessmann 7439313 Gas Valve/Venturi Assembly for Vitodens 100-W WB1B/WB1Bc Series Boilers : Tools & Home Improvement - Amazon.com
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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
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Viessmann 7839747 Flow Switch for Vitodens B2TB/B1HA/B1KA/B2HB/B2HA Series Boilers : Arts, Crafts & Sewing - Amazon.com