First, did you know the insert might weigh around 300 pounds? Yes, way! You are in for a big job.
Second, are you truly committed to losing the fireplace entirely? Fireplaces ADD to re-sale values.
Third, while it looks rusted, you might contact the manufacturer for options . . . and instructions on how to remove it (reverse the installation directions). You can contact them
Ashley Hearth Products
227 Industrial Park Road
South Pittsburg, TN 37380
(800) 750-2723 or E-mail: firstname.lastname@example.org