longislandsteve wrote:The vigilant is rated at 2000Sq.Feet .And the Harmon TLC is rated at 1700-3000.
Ignore the square foot ratings, they are next to meaningless because every house is different. Different layout, different insulation, different location, different different different. You will do better to estimate your actual heat needs, either through standard heat-loss calculations or based on past (peak) fuel usage, and take into account whether you can successfully circulate the heated air from where the stove is to where heat is needed.
After you have done that, look at the stoves' BTU ratings and ignore those, too. Just kidding, the BTU ratings are usually a good guide, as long as you realize that most stove manufacturers over-rate them significantly. My rule of thumb, for what it's worth, is that a stove can comfortably produce 50 to 60 percent of the rated heat. On really cold days you can push it for more heat, but you don't want to have to do that all the time.