Go green and heat your home while creating a living environment with beautiful ambiance using the sure heat 18-inch mt. Vernon oak log fireplace insert. With no ash, no wood, and no hassle you"ll quickly forget the inconvenient days of burning real wood. Our set contains a manual controlled valve system and is built to work with a liquid propane fuel supply . This beautifully designed unit uses an innovative u-shaped dual burner to provide a superior and very realistic dancing flame pattern. These golden flames are surrounded by six highly detailed, hand painted ceramic logs traditionally stacked on a tiered grate; which realistically recreates the look of a mature fire. Because this unit is vent free, the heat from the fire is pushed into the living space, rather then up a chimney. This allows for an amazing 99.9-percent heating efficiency. Our 18-inch mt. Vernon log set comes with a push button ignition and is built to fit in any fireplace with minimum measurements of 28-inch front width, 15-inch depth, and 21-inch back width. Safety specs include: 100-percent carbon monoxide and oxygen depletions safe; csa approved as a heating appliance; safety pilot light valve system and oxygen depletion sensor included. Will heat approximately 1200-1500 square feet at only 1/4 the cost of a real fire per hour. Important: Regulations for installation and use may vary by region. Please review your local codes as they apply to vented and unvented appliances. In absence of local codes, follow The National Fuel Gas Code ANSIZ223.1/NFPA 54