Two reasons: 1. Ambiance and Feel! We've wanted to have a fireplace, and love the hot air feel of pellet stoves and woodstoves. 2. Offsetting oil consumption: While I had no plans on the "immediate" payoff of burning pellet over heating oil, in the long run (i.e., 5-10 years) I think it will pay itself off. Also, it is more (but not quite entirely) carbon neutral than oil - and seemed more environmentally responsible.