It's nice to have options, keeps total energy costs down. I just figured you could find a way to easily swap out the head if you just wanted to burn logs. Pop some pins off the door and have the Pellergy head on a frame where you just roll it in to position lock it in place and you can burn pellets instead of logs. You want to burn logs pull the Pellergy head out and install the door back on. But if the wood boiler craps out you would have to burn oil. Like I said its nice to have options.