This refers to a device used to heat a room. It can be an electric, gas, or wood-burning appliance.
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I warm up the room with a heater.
stove
This can refer to a kitchen appliance used for cooking food. It could be a gas stove, electric stove, or wood-burning stove.
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She bought a new stove.
Generated collocations (experimental)
to turn on the heaterto turn off the heaterelectric heatergas stoveto sit in front of the heaterto warm up by the heaterthe heater breaks downportable stoveto gather around the heaterheat from the heater