It depends on the wattage of the wall heater. Some heaters use 600 watts and some use 1500 watts. So if you use an average of 1000 watts per day, your electric bill would be $33 a month. If you used an average of 1500 watts per day, your electric bill would be $50 a month.

It depends on the size of the wall heater. But generally speaking, wall heaters use a lot of electricity. So if you're planning on installing one, make sure you have an adequate amount of electricity to support it. Otherwise, you may end up paying more in electric bills than you bargained for.