Energy costs are a major household or business expenditure, especially in harsher winter climates. As a fuel source, wood -- in addition to being readily available and totally renewable -- is also very inexpensive compared to other fuel sources. In fact, the energy savings realized by heating with a Central Boiler outdoor furnace can often pay back the purchase price in the first two years. By adding a domestic water-to-water heat exchanger, a Central Boiler outdoor furnace can also provide all of your hot water. You can then turn your water heater off and realize big savings on your electric or gas bill. Over a ten-year period, a homeowner or business may save $20,000 to $100,000 or more on heating costs.