block heater vs brazier

block heater

noun
  • An electric heater that heats the engine of a car to ease starting in cold weather. 

brazier

noun
  • An upright standing or hanging metal bowl used for holding burning coal for a source of light or heat. 

  • A worker in brass. 

How often have the words block heater and brazier occurred in a corpus of books? (source: Google Ngram Viewer )