Pellet furnace holds just under 3 bags (109# or 112#?)and will a couple/few days on low. The Enerzone holds 70 lbs (just under 2 bags) and will couple days on low. But I check them once a day. A bag a day is the norm when temps are cold. But the entire house is always the same temp, there is no need to babysit the stove, and no mess