The method of distribution can be forced air, under floor boilers and pipes, baseboard, zonal, gravity, heat pumps, ceiling wires and, of course, wood stove and fireplace. Some have higher purchase prices, while others cost more to maintain or operate.
The more energy efficient an appliance is, the less it costs to run and the lower your utility bills. Use this knowledge to evaluate the asking price of any home. You'll be money ahead as you factor its heat source into any offer! More information on heating is available right here.