The invention provides processes and apparatuses for safely, rapidly, cost-effectively and efficiently producing a superheated steam. These processes and apparatuses involve the combustion of one or more fuels containing the element hydrogen, the element carbon or the elements hydrogen and carbon. One or more of the combustion reactions are incomplete combustion reactions, and another combustion is a complete combustion reaction. Water that circulates around one or more combustion chambers and areas, but that does not enter into the combustion chambers or areas becomes converted into a high purity superheated steam product or dry saturated steam product containing superheated steam.