The ideal airport solution; MIH400HC Indirect Flame Heater . The MIH400HC (heat cart) is an ideal airport solution. The MIH400HC is compact and portable while providing a clean and reliable blast of heat for aircraft, hangars, and ground support equipment. It represents the latest in burner, fuel flow, and airflow technology. Rigorous testing has yielded a product that can stand up to the most extreme cold weather environments. The MIH400HC is for use on RJ style to narrow body aircraft to eliminate auxiliary power unit (APU) use for substantial fuel burn savings.