Sounds like you might have the perfect set-up, then. That used Harman Accentra shown in the first craigslist add might be exactly what you need. As a Harman owner myself, albeit a P61A, I can tell you that you can't go wrong with a Harman. I would recommend you oversize your stove slightly if possible so as to be able to keep up on a really cold day or several in a row should you need to. My brother in law lives in Boxboro, Mass. and I know he can get cold weather in his part of Mass. Never hurts to have more capacity than necessary as you can always dial them back but you can't turn them up beyond their capacity. Good luck and let us know how you make out.