IPA: /ˈbɜːrnər/
KK: /ˈbɜrnər/
A device that produces heat or flame, often found on a stove or furnace.
She turned on the burner to cook the pasta.
Burner → It is formed from "burn" (from Old English "byrnian", meaning to consume with fire) and "-er" (meaning a person or thing that performs an action). A burner is a device or object that performs the action of burning.
Think of something that 'consumes with fire' ('burn') — and the '-er' indicates it is a device that does this action. A burner is something that burns.