What is a boiler?

A boiler is a closed vessel that transforms water into high-pressure steam.

The boiler is a white metal unit that is often located in the kitchen, although it may also be found in any other room in the house, as well as outside in an outhouse/garage or in the garden. It is the most crucial component of a central heating system since it generates heat. It is essentially a miniature furnace that runs on gas, oil, or LPG as fuel. There are also many sorts of boilers depending on how they function, but we’ll get into that later.

Working of a boiler

Pipes enter the boiler from beneath in a conventional gas central heating boiler. One is the pipe that feeds gas into the boiler from the mains gas supply (which is located outside your home on the street).

1-The fuel jets and heat exchangers are located inside the boiler. When you switch on your heating, a valve in the boiler opens, allowing gas from the mains supply to enter a sealed combustion chamber.These jets heat a heat exchanger, a metal component in the boiler that transfers heat to the cold-water pipe.

3. Hot water runs into each radiator in a closed-loop, entering on one side and exiting on the other, radiating heat into the room.

4. The water returns to the boiler after passing through all your radiators. The water has cooled considerably by this time; therefore, the boiler will retire the gas jets to reheat it before sending it around again.

IMPORTANT: If the flame within your boiler is not blue, but rather yellow or orange, your boiler is deficient in oxygen. This can be extremely dangerous since it could indicate that the boiler is producing a deadly chemical known as carbon monoxide.


In general, oil and LPG boilers function similarly to gas boilers. All Heating One is dedicated to delivering a professional and friendly service for all LPG needs to individuals who are not connected to the gas grid.


This boiler will heat your central heating system but not your faucets, bathtubs, or showers. The boiler receives cold water from a tank in the loft by gravity. These boilers work in coordination with a hot water storage cylinder in an airing closet to heat and store water for usage throughout the house.


A system boiler is like a standard boiler in that it requires a hot water storage cylinder to store hot water for your taps, but it is fed cold water at a greater pressure from the mains. As a result, there is no need for an attic feed tank.


The Combi boiler delivers heat for both radiators and hot water on demand because they draw water straight from the main supply and heat it as needed.One is for your radiators, while the other is for your taps, showers, and bath. Because the cold water comes from the mains, there is no need for a feed tank in the attic, and it generates hot water on demand, there is no need for a storage cylinder.


It’s time to replace your boiler if it’s more than 8 years old, is becoming less dependable, more expensive to run, or has entirely broken down. Boiler installation costs may range from £500 to £1,000 on average (in addition to the cost of the boiler itself), therefore we strongly advise evaluating numerous quotations when looking for the best deal.

While a boiler replacement might be an expensive investment, it’s vital to keep in mind that a more energy-efficient boiler can save you money on your heating expenses. Take a look at our guide to New Boiler Replacement & Installation Costs for a more in-depth look at how much a boiler replacement can cost you.

If you are thinking about replacing a boiler or want to install a new boiler our professionals are a call away from you contact us at 0800 3314395  

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