Abstract: A space heater comprising a fuel reservoir, a primary combustion chamber having an exhaust gas outlet, an exhaust gas re-circulation duct, and a chimney. The exhaust gas re-circulation duct captures at least a portion of the exhaust gas exiting from the primary combustion chamber through the exhaust gas outlet and delivers the captured exhaust gas back to the primary combustion chamber. The chimney receives exhaust gas that is not captured by the exhaust gas re-circulation duct and expels the non-captured exhaust gas into the atmosphere surrounding the space heater.