The Harman P68 Pellet Stove will burn any grade of pellet at maximum efficiency. Wood pellets have become a popular form of heat because they are environmentally friendly, extremely clean burning and cost effective. This means you can purchase the lower quality pellets and still keep your home at your desired temperature. The P68 automatically lights its own fire and burns at the correct output to maintain the desired room temperature. When no heat is required, the P68 will shutdown and re-ignite when the demand for heat returns.