HEATER.
The Heater is used on an engine in connection with a boiler for heating the feed water before it enters the boiler under steam pressure. It is usually constructed of a shell of cast or boiler iron into which live or exhaust steam is admitted. This shell usually contains a series of pipes or a coil of pipe, through which the feed water is forced by the pump, the water thereby being heated to a high temperature before entering the boiler.