I did find some info on the Flame XTD 1.9 I.
http://www.efireplacestore.com/cpf-93362.html
"The Flame XTD 1.9-I EPA Wood Burning Fireplace Insert has a generous 2.3 cubic foot firebox that can hold plenty of wood. The powerful 70,000 BTU maximum output can generate enough heat to comfortably heat areas from 1050 to 1,950 square feet in area. "
http://www.efireplacestore.com/cpf-93362.html
"The Flame XTD 1.9-I EPA Wood Burning Fireplace Insert has a generous 2.3 cubic foot firebox that can hold plenty of wood. The powerful 70,000 BTU maximum output can generate enough heat to comfortably heat areas from 1050 to 1,950 square feet in area. "