searching for "емайлирани съдове" in bulgarian..

https://elcishop.com/product-category/емайлирани-съдове/

https://www.mira-n.net/emailirani_rom_black.html

https://zana-bg.com/kuhnya/sdove-za-gotvene/emajlirani/kupro...

so 16L - and 50L - pots do exist.. but you have to find some importer around you. Manufacturers Seems russian, romanian, bulgarian..