The Ambiance Elegance® Wood Fireplaces are the best there is. The Elegance® 42 is our largest version boasting 100,000 BTU on high. Yet, you can have that big firebox burn as slow as 11,700 BTU per hour providing well over 10 hours burn time when using hard wood. The Soapstone lining inside has no equal for heat management. It absorbs 15% more heat than firebrick and radiates heat 5 times more than firebrick. The clean view on the fire is stunning! The glass dimensions truly represent the view on the fire, no burn tubes obstruction!