burner vs immersion heater

burner

noun
  • A device that generates localized heat for experiments; a Bunsen burner. 

  • A pyrotechnic tear gas canister. 

  • An elaborate piece of graffiti. 

  • A gun. 

  • Someone or something which burns. 

  • A device that allows data or music to be stored on a CDR or CD-ROM. 

  • A device that burns fuel; e.g. a diesel engine; a hot-air balloon's propulsion system. 

  • A device for burning refuse; an incinerator. 

  • An app that creates temporary phone numbers for a user. 

  • An element on a kitchen stove that generates localized heat for cooking. 

immersion heater

noun
  • A device for supplying domestic hot water in which a thermostatically-controlled heating element is immersed within a tank of water 

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