The WoodMaster Plus outdoor alternative fuel furnace burns corn, wood, paper pellets, barley, beet pulp, sunflowers, dried cherry pits, soybeans, and a variety of other alternative fuels. It easily connects into a homeowner's existing heating system, making a transition to the outdoor furnace simple, states the manufacturer. According to the company, it is compatible with most existing heating systems - domestic hot water, forced air, hot water baseboard, and radiant floor heat units. Model AFS 1100 delivers 200,000 Btu, and it can heat up to 8,000 square feet. Optional bin sizes are available.

Northwest Manufacturing, 600 Polk Ave., Red Lake Falls, MN 56750; 800-932-3629;

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