If no drain tap installed in your lines then need to turn off water supply and disconnect the lines https://www.manualslib.com/manual/693346/Bosch-W-135-K-B.html
You dont drain theses type water heaters
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If no drain tap installed in your lines then need to turn off water supply and disconnect the lines https://www.manualslib.com/manual/693346/Bosch-W-135-K-B.html
You dont drain theses type water heaters