冬天，我们依靠电暖气来保持房子温暖。

In winter, we rely on an electric ___heater to keep the house warm.

我决定买一张新地毯和一个小暖气。

I have decided to buy a new carpet and a little ___heater.

办公室有一个中央暖气，为所有房间提供温暖。

The office has a central ___heater that provides warmth to all rooms.