Installing a boiler step by step

Your boiler is the heart of your home. It’s responsible for everything, from heating your home in winter to running your hot water after a long day. A boiler failure can cause disruption and inconvenience in your day.

It is important to choose the right product and an experienced installer in order to get a reliable boiler.

Locating an installer

It is a good idea to contact at least three plumbers to visit your home to discuss your hot water and heating needs. Installers can vary in price and diagnosis. They will talk with you about whether a replacement boiler is necessary or if a better solution is available.

The installer will explain all the available control systems to you, and make recommendations based on your preferences and any extras such as weather compensation, load compensation, smart functionality or smart functionality.

Removal of boiler

Installers will typically start by removing the boiler. This time frame will vary depending on the complexity of your job and the current system.

System cleanse

British Standards require that your system be cleaned or flushed by the installer. Your system’s condition will determine the type of clean required. A chemical flush might suffice or a power flush may need to be performed. It is essential to keep your boiler’s water clean, especially when installing a new boiler. It is important to flush your system before installing any new boiler.

Upgrade to pipework

Your pipework may need to be upgraded or modified for your new boiler fitting. Although pipework is not an easy job, it can take up a lot of time for the installer.

Fitting of boiler

Your new boiler will be installed by the installer either at your existing boiler’s location or in a new one. Although you can move your boiler to a different location, it will cost more and take longer. Listen to the recommendations of your installer.


Installers should recommend that a system filter be installed alongside your new boiler, in accordance with British Standards best practices. The system filter protects your boiler from any debris and sludge over time. 

To prevent this, the installer will treat the system first with a cleaner, then apply an inhibitor to stop corrosion. The system filter will ensure that your boiler is as efficient as possible and provides comfort for the entire house. Other accessories, such as filling loops, flues and controls, will also be installed.


After your boiler has been installed, and all the pipework is completed, your installer will commission it to make sure everything works as it should.

Your installer should complete a handover after the work is completed. This will ensure that you are as informed as possible and can use the controls to operate the boiler. It also helps you understand basic maintenance checks you might need to make during the boiler’s life.

Warranty registration

The homeowner or the installer must register the boiler with the manufacturer to ensure that the guarantee of the product is valid. This will ensure that you are protected in the event of any problems.

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