I will have a very well insulated 2200 sq. ft. ranch and at 15-18k for a woodgun 100 it will never pay for itself. I can heat this house for 1,500 dollars a year. At 15k I can make 300 dollars @2% interest and pay for Februarys heat bill. By the time I save 15k on my gas bill the woodgun will be worn out. I might do it anyway because my wife claims 73 degrees is cold and can feel a draft. A Woodgun 100 with hydronic heat will fix the problem, the floor will be 80 degrees instead of 50 degrees. I might just go with the Woodgun with forced air. This will save 4k? Any comments about the Woodgun 100?