Your great room is almost the size of my entire house, on a few occasions I have warmed my 24'x14' living room with the 1500 watt heater but it just takes the chill out and will not usually get it much above 50F when 20F outside even running 24/7. A room that size would need two space heaters to get warm and much more money. I usually don't heat my house and since updating the windows and insulation last years it almost never drops below 40F in here when 20F at night.sylvie said:That's what I suspected; sales spin, costly to run, one "breadbox" not really heating my large 850 sq' great room.
DH has a flyer on the heaters and I said I wanted to run it by those on SS before considering buying one (or nine plus!).