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Bottom Burn outside furnace
Eugene Cauffman, Claypool, Ind., built his first outside furnace in 1981. It worked so well it soon came on the market, manufactured by Sure Flame Inc., Huntington, Ind. It was the first wood furnace of its kind to be UL-approved.
"That original outside furnace was safe, clean, had a large capacity, and could be automatically controlled. But I thought the efficiency could be improved and that creosote could be eliminated. That's why I developed this latest new furnace that produces virtually no smoke or creosote, even with green wood," says Cauffman.
The new gasifier stove is unusual in that it turns wood into combustible gases that burn at the bottom of the stove, leaving only a small amount of powdery ash at the bottom of the stove.
"People shake their heads in amazement when they see the fire chamber filled with blue flames. When the stove is burning, it burns as clean as natural gas. It burns 1/3 to 1/2 less wood than a conventionally built stove to produce the same amount of heat and it has completely solved the problem of creosote," says Cauffman.
A blower forces air downward through wood stacked on the grate in the 22 by 26-in. firebox. As the stove heats up, flames shoot downward into a fire chamber below the grate. A second fan force-feeds combustion air directly into the fire chamber. Smoke passing downward through the hot coals at the bottom of the logs is gassified, and burns up in the fire chamber. The super-heated fire leaves almost no ash to clean out. Warm air leaving the fire chamber passes through a heat exchanger, which then carries warmed air into the house.
"Like the original Sure-Flame furnace, it sits outside the home and only the hot and coldairducts and thermostat wires enter the living space," says Cauffman, noting that Sure Flame, Inc., is in the process of finishing testing on fmal prototypes. Both forced air and hot water 200,000 btu models will be available for a price of around $2,000.
For more information, contact: FARM SHOW Followup, Eugene Cauffman, P.O. Box 94, Claypool, Ind. 46510 (ph 219 566-2549).


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1988 - Volume #12, Issue #1