heater

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

“Turn on the heater; I'm cold.”

A person who heats something, for example in metalworking.

A gun.

“The thug pumped two rounds from his heater into her.”

A fastball, especially one thrown at high velocity.

“Jones threw a heater under his chin.”

An extended winning streak.

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

A medieval European shield having a rounded triangle shape like a clothes iron.