MHI Superheated Steam Generators One Atmosphere Boiler What is superheated-steam? When water molecules exist in a gaseous form at a temperature above the boiling-point temperature of water it is called the superheated … MHI Superheated Steam Generators One Atmosphere Boiler What is superheated-steam? When water molecules exist in a gaseous form at a temperature above the boiling-point temperature of water it is called the superheated …