electric heater
US /ɪˈlɛktrɪk ˈhiːtər/
UK /ɪˈlɛktrɪk ˈhiːtər/

1.
a device that converts electric current into heat, used for heating rooms or water
:
•
We bought an electric heater for the chilly evenings.
•
The old electric heater was not very efficient.