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a 200 sq ft space is about as big as a 6x6x6 area. This is pretty small. I have a 8x10x7=560 sq ft area that I heat with a quartz heater. It keeps the area at about 50 degrees F with outside temps below 20 degrees F.
They are talking about square feet; you are talking about cubic feet. So room that is 8 x 10 x 7 is an 80 ft.² room but a 560 ft.³ room.
But I will say this, they are being deliberately vague. They say it heats "up to 120-200 sq ft room." If the room is say 12 x 10 x 4, it will require a lot less heat than a room that is 12 x 10 x 12, although both are 120 ft.² rooms. Still, because of the fire risk of so many kinds of heaters, it might be worth giving one of these a shot.
My BAD. However, I have a quartz heater that is running at 1500 watts with two 250 watt heat lamps and it BARELY keeps the area that is 10x8 80 sq ft above 50 degress F. So I can not imagine a heater as described that would heat a 20x10 area. I have a 7 ft. hieght and the holes are plugged up so no heat escapes.
I am going to get the foam insulation, the type that is about 1 inch thick and can easily be cut to size with an aluminium backing so the birds do not peck at it.