The size of pellet stove you'll need depends on the square footage of the area you want to heat and the insulation levels of your home. As a general guideline, a pellet stove with an output of 40,000 BTUs can heat up to 1,500 square feet in a well-insulated home. However, it's always best to consult with our professionals at Miami Fireplace and Stoves to ensure you get the right size stove for your specific heating needs.