Hi Flame America offers an extra-large wood-burning fireplace insert, uniquely designed to fit in almost any fireplace without the need to use a surround. The sleek HF-577IU7 Highlander lets the beauty of the fireplace show through. Save money on heating bills while you’re relaxing, gazing into the large, air-washed glass window. The 3–cubic-foot firebox allows for logs of up to 24 inches in length. With a maximum output of 85,000 Btu per hour, this insert can heat an area of up to 2,500 square feet, making it large enough to be a primary heat source for your home.