Smallest Insert Offered 18,000 BTU 950 Sq Ft Fits 17 1/2 H x 24 W x 13 3/8 D

31,000 BTU Heats Up To 1500 Sq Ft

Medium 31,000 Heats Up To 1500 Sq Ft

Medium 25,000 BTU Heats Up To 1250 Sq Ft

Large 39,000 Heats Up To 2000 Sq Ft

Large 39,000 Heats Up To 2000 Sq Ft

Large 40,000 BTU Heats Up To 2000 Sq Ft

Large 40,000 BTU Heats Up To 2000 Sq Ft

Large 33,000 BTU Heats Up To 1650 Sq Ft