We bought one from a different company, but essentially the same heater. Six quartz lamps heat the air and a fan pushes it into the room. Unfortunately, at least for us, it is too good to be true.
We have a 20x20 unheated FL room and we thought this would be perfect. We have a gas hater but were looking for something we could safely leave on all the time. We were assured that it would work no problem. The heater simply did nothing for us. It couldn't heat the room nor could it keep it warm. I tried using the gas heater to "prime" the room and then use the other heater but it couldn't even maintain the heat.
Maybe the Edenpure is different, but it looks essentially the same as the one we had. OTOH, the company was good about taking it back and refunding our *gulp* $600.