heater

Short definition from Wiktionary

Noun

1. 1
   A device that produces and radiates heat, typically to raise the temperature of a room or building.
2. 2
   A person who heats something, for example in metalworking.
3. 3
   A gun.
4. 4
   A fastball, especially one thrown at high velocity.
5. 5
   An extended winning streak.
6. 6
   A medieval European shield having a rounded triangle shape like a clothes iron.
7. 7
   A dead heat; a race in which two or more competitors reach the finish line simultaneously.
8. 8
   Synonym of banger (“powerfully energetic or very good song”).

Proper noun

1. 1
   A surname.