Beautiful and highly efficient, the FV44i insert's huge, 600 sq. in. viewing area is ideal for taking in the realistic FullView log fire. The BurnGreen™ burner provides an impressive 40,000 to 15,300 BTUH, allowing you to adjust the heat to your comfort and still enjoy a full flame, even on low. Its size and generous heat output make it a particularly good choice for large rooms or rooms with tall ceilings or lots of windows.