Wanted to advise anyone out there thinking of purchasing a Harman P61a stove. Don't. Not because it's a bad stove. I absolutely love my new Harman P61a. However, for the stinkin' couple hundred bucks extra I should've gotten the P68 and had the extra 7,000 btu at my disposal. Last night was the first real cold night here in Philly as it dropped to about 30. Cold, but not ridiculous by any means. And light winds so there was no wind chill factor. The main floor, where the stove is located, was only at 70 at 6am despite running it pretty high all night. I now realize that a great stove can't overcome very poor insulation, and I wish I would have just gotten the damn P68. Anyone thinking of a P61a, do yourself a favor and get the P68. The small extra cost is well worth it.