The initial design by Mr. Traeger consisted of a “classic” drum barrel shaped grill design with a chimney on top. Instead of the firebox, the grill contained a pellet hopper. It used a fan to distribute the heat evenly over the pellets. Unlike the modern pellet grills, the original design didn’t include any auto-ignition features and the pellets had to be lit manually.
Although these are marketed as grills, they do much more, including baking or roasting. Because they heat by convection, you might not get the grill marks that a gas or charcoal grill will give you, but you also won’t have the flame-up problems. While many pellet grills offer high cooking temperatures, the maximum depends on ambient temperature and wind. Many users wrap their grills in special insulating covers to help maintain heat, reduce fuel use, and reach the higher temperatures they desire.