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How Long Does it Take to Replace a Boiler.

Writer's picture: CLW Heating Ltd. CLW Heating Ltd.

Updated: Jan 20




Replacing a boiler in the UK typically takes 6–8 hours for a like-for-like swap, but upgrades or relocations can take longer. Discover the factors that affect installation time and why choosing professionals like CLW Heating Ltd guarantees a smooth process.

Upgrading a boiler is one of the most important home improvements you can undertake. A new boiler not only ensures your home stays warm, and your water runs hot but also improves energy efficiency and can save you money on utility bills. However, if you’re considering replacing your boiler, one common question you’re likely asking is, “How long will it take?”

The time it takes to replace a boiler in the UK depends on several factors, such as the type of boiler you’re installing, the complexity of the job, and whether you’re upgrading your system. Let’s break it all down step by step so you know what to expect.

 

What Affects the Time It Takes to Replace a Boiler?

While it’s crucial to have a professional handle most boiler maintenance tasks, especially those that involve gas or electricity, there are several routine checks and minor maintenance tasks that you can safely perform yourself to help keep your boiler in good working condition. Here’s a guide to what you can do:


The Type of Boiler Being Installed

The kind of boiler you’re replacing and the new system you’re installing play a major role in determining how long the process will take. For example:


• Like-for-Like Replacement: Replacing a combi boiler with another combi boiler is usually straightforward and can be done within a day.

• System Upgrade: If you’re switching from a conventional boiler to a combi boiler or vice versa, the installation might take 2–3 days as it involves more pipework and possible system reconfiguration.


The Location of the Boiler

The position of your boiler also matters. If the new boiler is being installed in the same location as the old one, the process is much faster. However, if you’re relocating the boiler, it can add another day or two to the job because of the additional plumbing and electrical work required.


The Condition of Your Existing System

While every installation is unique, here’s a general guide to how long different types of boiler replacements take:• Straight Swap (Same Type, Same Location): 6–8 hours.• Upgrade to a Different Type (e.g., Conventional to Combi): 1–3 days.• Boiler Relocation: Add an extra day or two, depending on the complexity.

It’s worth noting that an experienced Gas Safe registered engineer will be able to give you a more accurate estimate once they assess your home and system requirements.


What Happens During a Boiler Replacement?

Replacing a boiler involves several steps to ensure the system runs safely and efficiently:


  • Inspection and Removal of the Old Boiler: The engineer will assess your existing system, safely disconnect the old boiler, and remove it from your home.

  • Preparation of the New Boiler Location: If the boiler is being moved, this step involves laying new pipes, electrical connections, or flue adjustments.

  • Installation of the New Boiler: The engineer will connect the new boiler to your heating and hot water system.

  • Testing and Commissioning: Once installed, the system is thoroughly tested to ensure everything works as it should.

  • Handover and Explanation: The engineer will explain how to operate the boiler and answer any questions.


 

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