Legal Resources for purchasing a faulty Pellet Stove for heating a residence

We purchased a pellet stove in August in hopes that our investment would help save money on heating cost and be cleaner for our environment. Not even getting one season out of our nearly $4000 investment, our stove has not been working correctly. It smokes out our house while we are asleep causing our smoke alarms to go off and soot damage to our carpets and furniture, and there have been some other problems with the stove also. The dealer we have purchased the stove from have not been helpful in terms of resolving the situation, they offer a 1 year full warrenty on all products. They say they are too busy to return our calls, and they have contacted the manufacturer. I am wondering what kind of legal resource we have in getting the stove fixed and what legal resource we have in potential futer problems as well with a major home purchase such as this? What time frame are they expected to have this problem resolved as this is our heating source?