I'm burning a Napoleon High Country zero clearance fireplace with a blower. It has a very large firebox. My house is 3000sf and I can keep it above 70 degrees with the temp in the 20's outside. Usually have to reload at the 4 hour mark and shove in 4 or 5 splits of hardwood each time. I don't burn at night and just allow the stove to burn out and I restart from coals in the morning. I'm just wondering if this amount of wood is excessive to heat a 3000sq house.