https://www.kosemo.cz/files/614_63040124_servisni-navod-2107_cz.pdf

https://www.kosemo.cz/files/05647118_bfu_obsluha_cz.pdf

ovladani buderus bfu

https://the78mole.de/reverse-engineering-the-buderus-km217/

https://www.tindie.com/products/the78mole/buderus-km271-wifi-replacement/

https://the78mole.de/projects/km271-wifi-howto/