How Do Gas Central Heating Boilers Work?

I bet this is the question that people would have wished about asking years and years ago when people were making their own wood and coal fires to keep warm. The amount of time it would have taken to set a fire alight, summer would have already arrived!

Ok maybe that is a slight exaggeration, but boilers naturally do save the hard work and provide a steady flow of heat into our homes.

So how does a gas central heating boiler actually work?

The boiler is the part of the system which produces the heat, and undoubtedly is the most important aspect of any heating system. The boiler will connect to a gas mains supply within your home, and at the flick of a switch the valve opens and gas passes into the combustion chamber within the boiler via small jets.

Once the gas is in the boiler chamber, it is set alight by an electric ignition system which in turn heats cold water pipes to around 60°C. The pipes would run throughout the home and pass through each hot water radiator before then returning to the boiler. An electric pump is used within the boiler to keep the water flowing through the circuit.

As this is quite a long circuit, once the water returns to the boiler it has already cooled down forcing the boiler to continually keep firing in order to produce heat for the home.

The carbon dioxide and steam that is created as a waste product of burning gas flows through a small boiler flue to the outside of the building.

This is the basic gas central heating system that would be incorporated in most homes, however depending on the type of fuel you use (gas, electric, wood, oil etc) will determine the slight differences that would be made to this system.

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