And the units vent through plastic pipes making them easy to place anywhere in the house. The initial cost is higher. With inexpensive fuel it may take several years to recover the cost. Since sealed combustion does not remove air from the house, there may be a need for additional ventilation. Find dealers you trust, then comparison shop.
Manufacturers now offer sealed combustion furnaces, boilers, and gas-fired fireplaces.
Sealed combustion water heaters and wood-fireplaces may be harder to find, but are available. Newly developed innovative units, combining a hot water boiler, water heater, and forced air heating system, are now available. Ask to see efficiency ratings and warranties. All fuels can be safely used. During the heating season it takes from 100 to 150 million Btu's to heat an typical Iowa home.