冬天来了，我们需要打开暖气。

We need to turn on the ___heater now that winter is here.

这个房间的暖气坏了，我们需要修理它。

The ___heater in this room is broken and we need to fix it.

歹徒从口袋里掏出一把手枪威胁店员。

The thug pulled a ___heater from his pocket to threaten the clerk.