In addition to providing savings, using an oak base also creates consistency. Different types of wood have different densities, burn at different rates, and produce different amounts of heat and smoke. For instance, cherry burns faster than hickory, so using 100% cherry you’d go through more pellets than if using 100% hickory. The addition of oak allows every flavor to burn at a similar rate and with a similar heat output, providing consistency from cook to cook.
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.