There's an electric heater in the bedroom.

卧室里有一台电暖器。

《柯林斯英汉双解大词典》

An electric heater consumes too much electricity.

电热器用电太费。

《新英汉大辞典》

Then open the “hot out” valve at the electric water heater and turn the breaker on.

然后我们关闭热水器的电力加热器的开关并将断路器打开。

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The electric heater and the old wood-burning range together would keep the room at fifty degrees, and he could sleep.

NEWYORKER: Idols

In another incident in Bala, Gwynedd, a fire was started after water dripped into an electric heater used to defrost pipes.

BBC: Warning after frozen pipes spark spate of fires

While they were negotiating with him, officials told the media Dykes used an electric heater and blankets to keep the boy warm.

CNN: Inside the bunker: From storm shelter to boy's prison