heater
n. countable B1 Intermediate US //ˈhitɝ// UK //hˈiːtɐ// heater
n. a device that makes a room or building warm. You use it to describe things like radiators, electric heaters, or central heating systems.
n. a device or appliance designed to produce heat for warming a space or object.
We turned on the heater when it got cold.
She bought a small electric heater to keep her home office warm during winter.