We have had this heater for a few weeks now and have tried it in a number of places. I first tried it in a room of about 300 square meters. ft. and you couldn't feel the difference in air temperature unless you were a few feet away. I then tried it in a small room (less than 150ft) and it heated the room well for 2 hours and comfortably all night (had to turn the power down to about 1/2 power).
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