Outdoor heater Jackie reduces fine particular matter and toxic fumes - smoke - substantially. Burning wood can definitely be clean, but we need to get rid of open fireplaces and fire pits. When a fire’s combustion isn’t efficient enough to burn its fuel completely, tiny, unburnt particles will be left over. They combine to form what we call smoke. Jackie compares to the most efficient indoor heaters, setting new standards for patio heaters. Jackie consumes 3 to 4 times less wood.