Paragon gas-burning stoves fit most chimneys These gas-burning models are manufactured with heavy-duty, seam-welded steel bodies, cast doors (available in square, curved, or tracery door options) and adjustable feet. Conventional Flue installation allows the stoves to be fitted in Class 1, Class 2 and precast flues. Highly realistic log fuel beds are viewed through a large panoramic window and performance is controlled by a single knob, allowing the stove to deliver a net thermal efficiency of up to 79%. It all adds up to make Paragon CF and Alcaston stoves a must for today’s busy households.