A bank of tubes, in the exhaust gas duct after the boiler, used to heat the steam above the saturation temperature.

a device in a steam engine that heats the steam generated by the boiler again, increasing

a device used to increase the power of steam locomotives

Heat exchanger arranged to take heat from liquid going to the evaporator and use it to superheat vapour leaving the evaporator

a bank of steel tubes placed in the path of the exhaust gases from the furnace; the waste heat in the gases is utilised to heat up the dry saturated steam flowing through the tubes at constant presssure to obtain superheated steam