Basic Boiler Parts

A boiler is a type of self contained combustion system that has the ability to heat up water. The hot water that is being produced by the unit will be pushed into the heating systems and distributed evenly among the building. The designs used to build the unit will vary -but the parts remain the same. It is important to understand what the three major boiler parts are and how they function.


The burner is used to begin the combustion reaction inside of the unit. The thermostat will electronically transmit a message to the burner when the system is required to create heat. The fuel will be pumped by a filter mechanism to the unit from a fuel tank that sits outside, next to the boiler. A nozzle on the burner will transform the fuel into a spray and ignite it. Than the combustion reaction is created inside of the chamber.

Combustion Chamber

The combustion chamber is usually made of cast iron so that the fuel can be burned inside without causing any damager. The temperature inside the chamber will increase to a few hundred degrees in a short time. The heat that is created inside will be transferred to the heat exchanger when it reaches the right temperature.

Heat Exchanger

The water is filtered around the combustion chamber and will travel through a number of flue passages. The boiling, pressurized water will be pumped into the pipes that travel to the various radiators or baseboard heaters. These will than give off heat energy that is made inside of the boiler.


All of the parts that we mentions must be maintained and cleaned every few months to keep the boiler working efficiently and to prevent any damage from occurring. As you clean them off you should remember to remove dust and debris that has accumulated inside of the surrounding equipment.