Heater

noun

1. A device that produces and radiates heat, typically to raise the temperature of a room or building.

   "Turn on the heater; I'm cold."

2. A person who heats something, for example in metalworking.
3. A gun.

   "The thug pumped two rounds from his heater into her."

4. A fastball, especially one thrown at high velocity.

   "Jones threw a heater under his chin."

5. An extended winning streak.

   "Emmy went on a heater in Las Vegas and came back six thousand dollars richer."