space heater
US /ˈspeɪs ˌhiː.tər/
UK /ˈspeɪs ˌhiː.tər/

1.
a portable device used to heat a small area or room
:
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We used a space heater to warm up the garage.
•
Always keep flammable materials away from a space heater.
a portable device used to heat a small area or room