Is a Combi Boiler the Best Choice For Your Home in 2021?

Modern combi-boilers are a great option for home heating, but how do they compare to the competition?

If you are thinking of getting a new home boiler but aren’t sure which type is best for you, a modern combi-boiler is a great choice. A combi, or combination boiler is one of the most common options for British homeowners. They provide heat for both radiators and domestic hot water.

Combi boilers provide hot water quickly and efficiently because they only heat water when needed.

What’s In This Guide to Combi Boilers?

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Running costs for modern gas combi boilers are relatively low as they heat water only when a hot tap or shower is on. Combi-boilers are compact and use space efficiently as they don’t require an additional hot water cylinder or a cold water tank to be installed. A combi boiler is an energy-saving system because without the external water tank you won’t lose heat through poorly insulated pipes.

How Do Combi Boilers Work?

There are various types of gas combi boilers on the British market, but they all work in pretty much the same way. You set the temperature you want at the room thermostat and anytime the room temperature falls below this level, a signal is sent to the boiler. The boiler’s heat is passed into the heat distribution system (predominantly radiators in the UK). When the room temperature hits the desired level, the boiler then switches off.

To power the hot water system, cold water is pulled from the mains as required and passed through a heat exchanger. This highly efficient process transfers about 90% of the gas’s heat to the water providing you with piping hot water where you need it.


The combination gas boiler can produce a continuous flow of hot water. However, if more than one appliance is using the boiler simultaneously, you might experience a reduction in water pressure. So a combination boiler is not suitable for large households.

The Advantages of Combi Boilers

There are various advantages to this system that make them a great choice for new boiler:

Modern combi-boilers provide instant hot water and heat your home quickly and efficiently.

Combi boilers are compact and don’t take up too much space which makes them a perfect solution for smaller houses or apartments. They are also designed to look neat.

Due to the design, a professional can get you up and running with your home heating in no time at all.

The Disadvantages of Combi Boilers

But like everything in life, it’s not all good news.

Combination boilers are the most suitable for small households because the hot water is produced on demand and you can only use it for one task at a time. It is recommended to carefully set the heating programme according to your specific needs and daily routine.


Combi Boiler Prices

If you are thinking about buying a new or replacement combi boiler for your household, the best option to get a brand new device from a reputable company. Obviously, the price for new boilers is higher than for any second-hand devices but they will of course last longer and you have a warranty to cover any further repairs.

There are two main factors that can influence the price of a combination boiler. First is the size of your house.

The number of bedrooms and bathrooms that you have in your household will determine the size and the cost of the boiler you need.

For example, a combi boiler suitable for a house with one bathroom and three bedrooms can vary between £700 and £950. The medium-sized boilers will be slightly more expensive, coming in between £1,400 and £2,300.

The second factor that can affect the price of a combi boiler is the quality of the model that you choose. Different brands offer different prices and the quality, efficiency, and durability will vary accordingly. Use the length of guarantee as a barometer of quality.

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