Boilers

What Happens During a Boiler Installation?

What Happens During a Boiler Installation?
Written by Sam Thomas
Published on
August 29, 2025

A new boiler is one of the most important investments you can make for your home. It provides reliable heating, hot water, and improved comfort all year round. But if you’ve never had a boiler replaced before, you may be wondering what happens during the installation process. Knowing what to expect can help you prepare and feel confident about the work being carried out, whether you are arranging a boiler installation in Bath or a new system in Bristol.

The Boiler Installation Process Explained

While every home is different, most boiler installations follow a clear step by step process. Here’s what usually happens when you book a professional installation.

Initial Survey and Planning

Before any work begins, a qualified heating engineer will visit your home to assess your current system. They will look at your existing boiler, the size of your property, and your hot water needs. This helps determine the best type of boiler for your home. If you are considering renewable options, they can also explain how heat pumps in Bath or Bristol could work alongside or as an alternative to a boiler.

Removing the Old Boiler

If you are replacing an existing boiler, the first practical step is disconnecting and removing the old system. This is done safely and carefully to avoid disruption to your property. Depending on the size and location of the old unit, this stage can take a few hours.

Installing the New Boiler

Your new boiler is then installed in the chosen location. This involves connecting it to your central heating system, water pipes, and the flue, which safely expels gases outside the home. Professional heating engineers in Bath or Bristol will also ensure that all fittings and pipework are secure and compliant with safety standards.

System Upgrades if Required

Sometimes extra work is needed to make the most of your new boiler. This can include flushing the system to remove sludge, updating controls, or installing new radiators. For households in Bath and Bristol, plumbers may also carry out general plumbing services at this stage if upgrades are needed.

Testing and Safety Checks

Once the installation is complete, the system is thoroughly tested. Engineers will check water pressure, run performance checks, and make sure there are no leaks. Gas Safe registered engineers will also carry out safety inspections to confirm everything is working as it should.

Handover and Guidance

Finally, your installer will show you how to use your new boiler and controls. They will provide manuals and explain how to check basic settings. At this stage, they may also advise on booking annual boiler servicing in Bath or Bristol to keep your system running efficiently and to protect the manufacturer’s warranty.

Professional Boiler Installations in Bath and Bristol

At SNT Plumbing and Heating, we provide expert boiler installations, repairs, and servicing across Bath and Bristol. Whether you need a full boiler replacement, routine boiler servicing, or even advice on switching to heat pumps, our qualified team is here to help.

Sam Thomas
Founder, SNT Plumbing & Heating
Boilers

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