Hello out there. Can I get some advice regarding hearth/grate heaters? I was considering a wood burning insert for my 1500 sq ft ranch. I'm afraid the insert will over heat the living room and I'll be unable to enjoy the room. A retailer suggested a grate heater however I'm concerned with whether it will warm the room enough without kicking on my oil burner due to draft up the chimney. Can anyone help me please?