heater

US /ˈhiː.t̬ɚ/
UK /ˈhiː.t̬ɚ/
"heater" picture
1.

a device that produces heat, typically to warm a room or water

:
Turn on the heater; it's cold in here.
The water heater needs to be repaired.
2.

a person or thing that heats

:
This oven is a great heater for large dishes.
The sun is the ultimate heater of our planet.