Guide to central heating boilers

If you’re thinking of having a replacement boiler installed in your home, you will probably want to learn more about the various options and what each of them offers. We are going to take a look at combi boilers, what they are and how they work once they’re in use in your home. This will help you gain all of the information you need before you decide whether or not your next boiler should be a combi.

What is a Combi Boiler?

A combi (or combination) boiler is one that controls the entire central heating system directly. It does this from a single compact unit. They’re the most popular and commonly used types of boilers in the UK and people are still switching over to them from other older types of boilers.

Combination boilers suit the vast majority of homes in this country very well and there’s a variety of sizes and outputs. They are generally smaller than regular boilers and they don’t require a hot water tank or cylinder. This is one of their biggest benefits and selling point of a combination boiler system, as it allows people to save valuable space in the home.

Combi boilers provide instant access to hot water and the amount of hot water you can use at any one time is unlimited. You never have to wait for a water cylinder to heat up the way you do with other kinds of boilers.

If you’re looking at boilers from a green and energy efficient point of view, combi boilers are definitely a good choice. They are usually much more efficient than older types of boilers. The installation of a combi boiler tends to be easier, quicker and, importantly, cheaper for homeowners. The lack of a water cylinder means that there’s less pipework that needs to be installed, which makes things easier and less disruptive to your household.

How Combi Boilers Work

So, how does a combi boiler actually work?

Combination boilers are a single compact boiler system that heats both the hot water used in the household as well as the central heating radiators. The boiler is fed my mains water and heats the water as you trun on the hot water tap to use it. That is why there is no need for a hot water cylinder or a cold water tank in the home to work with the boiler.

Combi boilers are always on standby and that is how they are able to offer hot water whenever the user needs it. If a hot water tap or shower is turned on, the boiler fires-up in order to provide the hot water.

The boiler starts heating the water right away and the heat exchanger transfers the heat inside the boiler to the water quickly, delivering it to the tap thereafter. There are control valves inside these boilers than allow water to flow through or divert it to hot water taps when necessary.

In terms of the central heating system, the boiler will work according to the thermostat controls in the home. It will stop providing heat when the temperature set by the user via the thermostat is reached, allowing you to heat the home in the way you want to. With most modern boilers it is now advisable to install a smart thermostat to get the best efficiency from your heating system.

If you’re unsure of which combi boiler is right for you and you want help and support from experts who know what they’re talking about, don’t hesitate to get in touch. A member of our team will be more than happy to help you out and then carry out the boiler replacement services you require.



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Please feel free to contact us for more information or to arrange a visit by one of our expert Gas Safe Registered boiler engineers.

Call: 020 8367 9969