convector vs heating

convector

noun
  • A space heater that transfers heat by convection; a radiator 

heating

noun
  • A system that raises the temperature of a room or building. Compare heater. 

  • The act of making something hot. 

adj
  • Causing heat. 

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