calefactor vs charcoal burner

calefactor

noun
  • A heater; one who, or that which, makes hot, such as a stove, etc. 

charcoal burner

noun
  • A heater or brazier in which charcoal is burnt. 

  • A person whose job it is to make charcoal, traditionally by carbonizing wood in a charcoal pile or kiln. 

  • An edible European mushroom (Russula cyanoxantha). 

  • 1881, H.L. Brækstad (translator), Round the Yule Log: Norwegian Folk and Fairy Tales, page 308, "The Charcoal-Burner", translation of "Kullbrenneren", Peter Christen Asbjørnsen, in Norske Folke-Eventyr. Ny Samling 1871. 

How often have the words calefactor and charcoal burner occurred in a corpus of books? (source: Google Ngram Viewer )