I’m heating about 3300 square feet and did not know how much I needed to stock up on. Since Home Depot had the best prices by far I figured I buy a lot and try it out. As I don’t want to spend $5 plus for a gallon of oil when my contract runs out next month. I have twin 330 gallon takes, you do the math. I paid $3914 installed for a QuadraFire MountVernon AE free standing stove and just have it installed last Friday. My thinking is that the heat will blow into the foyer and rise up to the air condition returns then I can run the fan to distribute the heat through the house.