The Different Types Of Boilers And Their Functions

What is a boiler? It is a water containing vessel whose primary job is to transfer heat coming from a fuel source into steam which is then piped to a point where it can be readily used to run production equipments, provide heat, sterilize and steam-clean. The energy which is given by the steam is enough to convert it back in the form of water. When 100 percent of the steam that is produced has been returned to be reused, the system will be called a closed system. Some examples of the closed systems include hot water heating, closed steam heating as well as one-pipe systems.

Since there are some processes that will contaminate the steam, it is not all the time desirable to feed the condensate back to the boiler. A system which will not return the condensate is referred to as an open system.

The main types of boilers are as follows:

  • Fire tube. The hot gas or fire gas is being directed through the inside of the tubes within the shell of the boiler which are surrounded with water. The tubes are then arranged in banks so that the gas will be able to pass through the boiler up to at least 4 times before it will pass out the stack. The system will expose a maximum heat transfer on the surface of the water. The fire tube boilers are also called as shell boilers and usually produce up to as much as 750 hp or 25,000 pounds of steam every hour. Eighty percent of the boilers that are in use are usually in this configuration. A subtype of this kind of boiler is known as the packaged boiler. It is shipped complete with a fuel burning equipments, automatic controls, mechanical draft equipment and accessories which are designed to function automatically with just minimum attention. It is also important to prevent scale formation in this kind of boiler.


  • Water tube. In this system, the fire or hat gases will be directed to and around the outside of the tubing which contains water that are arranged in a vertical position.

If any of these systems breakdown, you can contact Simon from Capital Sheffield and they will help you fix your problem.