Boilers and furnaces differ in how they generate heat. Boilers utilize hot water or steam to heat your home through radiators or radiant floor systems. They are typically more efficient, provide consistent heat, and are long-lasting. On the other hand, furnaces distribute warm air through ducts using a blower and filter system. They are more common and better suited for larger spaces. Each system has its advantages, and selecting the right one depends on your specific heating needs and home infrastructure.