Lennox is releasing its Brentwood, an energy-efficient, wood burning fireplace. It features a single door crafted from European cast iron, 72 percent heat efficiency and ceramic glass for safety and optimum heat transfer. The fireplace has a 36-in. door for an unobstructed view and a textured, refractory-lined firebox that recreates a traditional masonry appearance. The Brentwood can heat between 1,000 to 2,000 sq. ft. and is rated at 55,000 Btu.