I want one for my shop how big of a space would it heat.
I can't tell you for sure, but the description says it will heat a 14' x 20' TENT.
The firebox is a fraction bigger than 11" W x 17" L x 11"H.
The chimney is welded steel oddball size 3 3/8" diameter, but from the floor to the chimney top is only about 6 1/2 feet tall.
15 inch long stovewood maybe 4" x 4" is about perfect for it.
The heater IS heavier duty than I thought it would be, though, and you CAN cook on it.