Hi- We're new to the pellet stove game. Decided to buy one to help defray (by a lot!) our HHO costs for the coming heating season. We're going with a Harman because we've found a very good dealer. My question is: My house is approx 1800 sf; one story with a great room (lr, dr,k), and three bedrooms farther down a hallway. My stove will be in the lr. Am I better off going with theP68 (68K btu), the 61A (61K btu) or will the XXV (50K btu) be enough to heat the house? I plan to turn on the oil furnace when the temp drops real low to prevent frozen pipes. Also I've heard complaints about fan and auger noise. How about those issues with the above named models? Any help you can give me will be greatly appreciated!!