Feeling chilly, I turned on the heater. ✬

This heater burns gas. ✬

This heater won't heat up that large room. ✬

Don't put the wallet on the top of the heater. ✬

The heater is broken. ✬

Did you turn off the heater? ✬

Our dorm's having heater problems. ✬

When the heater in the barn fails, you get milk-flavoured ice cubes. ✬

Tom can fix the heater. ✬

The heater is warming up the room. ✬