If you’re considering investing in a new boiler, ‘how long does a boiler replacement take?’ is probably one of the first questions you’ll ask.
The prospect of losing heating and hot water for any period is less than ideal. However, with a rough time frame, the process can feel much less daunting.
There’s no straightforward answer to this question: the duration of a boiler installation depends on several factors. We'll take you through how long a boiler replacement takes on average, the steps that can affect how long it takes, and tips to prepare for a smooth installation process!
Short answer: how long does a boiler replacement take?
Factors that affect boiler replacement time
Common problems which could increase the time it takes to fit a boiler
Tips for a smooth installation process
Book your boiler replacement with JustFix
FAQs about fitting a new boiler
Short answer: how long does a boiler replacement take?
On average, fitting a new boiler can take anywhere from 1 to 3 days. The exact duration depends on several factors, including the type of boiler you’re installing, the complexity of the job, and whether any additional work is required.
A straightforward like-for-like combi boiler replacement typically takes about 4-6 hours, while a more complicated installation that involves swapping or moving the system might take three or more days.
Now, let’s dive into the details so you can better understand what factors affect the time it takes to fit a new boiler.
Factors that affect boiler replacement time
We’ve compiled a list of the main factors affecting how long it takes to fit a boiler and a rough estimate of the time it might add to your installation. Consider the following things to better your understanding of how long it will take to fit your new boiler.
The type of boiler being installed
Combi boiler
Combi boilers are one of the most popular choices in the UK due to their efficiency and compact size. They heat water directly from the mains, so there’s no need for a separate water tank or cylinder.
Because of their simple design, replacing an old combi boiler with a new one usually takes the least time, typically around 4-6 hours if no complications arise.
System boiler
System boilers require a hot water cylinder but not a water tank, making them a bit more complex than combi boilers. Installing a new system boiler might take a full day, particularly if the cylinder needs to be installed or replaced as well.
Conventional boiler
Conventional boilers, also known as regular or heat-only boilers, are the most traditional type of boiler. They require both a hot water cylinder and a cold water storage tank, meaning the installation process could take longer or complications may arise.
If you’re replacing an old conventional boiler with a new one, the installation can take 2-3 days.
The complexity of the job
Existing vs desired set-up
If your new boiler is a straightforward replacement for an old one, with no need for additional work like rerouting pipes or upgrading your heating controls, the installation will be much quicker.
However, if you’re switching boiler types, like swapping out a conventional boiler for a combi boiler, additional work will be required, which can add a day or more to the installation time. See the additional work required section for ideas of what could crop up.
Pipework modifications
If the pipework in your home is outdated or doesn’t suit the new boiler, your engineer may need to modify or replace the pipes. This typically occurs when you are changing boiler types or moving your boiler.
This can involve significant work, especially in older homes, and may extend the installation time by several hours or even an entire day.
The location of the boiler
The location of your new boiler can affect its installation time. If it is being installed in a hard-to-reach area like a loft or a cramped cupboard, the engineers might take longer to complete the job.
Moving a boiler from one location to another within your home can also add to the overall installation time. Additionally, this could mean that additional works like pipework modifications are necessary, further increasing the time it could take to fit the boiler.
Additional work required
Power flushing
Power flushing is a process that cleans out your central heating system, removing sludge, rust, and debris that can accumulate over time.
Power flushing is often recommended when installing a new boiler to ensure the system runs efficiently. This work can add a few hours to the installation process.
Upgrading controls
Modern boilers often come with smart controls or more advanced thermostats to help you manage your heating more efficiently.
Installing and setting up controls like a smart thermostat can add extra time to the installation, particularly if they require wiring or additional configuration. Other upgrades, like magnetic boiler filters, can also prolong the boiler fitting process.
Regulatory requirements
Your engineer must ensure that your new boiler meets all current safety and building regulations, particularly Gas Safe regulations.
The engineer may have to conduct a thorough gas safety check. If the heating system doesn’t meet certain minimum pressure requirements, resolving this could add another half day to the installation time.
Your boiler may also have to be registered with the appropriate authorities. These steps can add time to the overall process but are crucial to reducing safety risks and ensuring a functional system.
Common problems that could increase the time it takes to fit a boiler
Unexpected issues
During the installation, your engineer might discover unexpected issues, such as asbestos, gas leaks, or faulty wiring. These problems need to be addressed before the installation can continue. Depending on the exact nature of the issue, this could add hours or days to the installation time.
Supply chain delays
Sometimes, the specific boiler model or parts required for your installation might not be readily available. As a result, the installation could be delayed until all the necessary components are on hand.
Access issues
If your boiler is being installed in an area with limited access, this can slow down the installation process. Engineers may need to take extra care to safely install the boiler in tight spaces, which could extend the timeline slightly.
Tips for a smooth installation process
Ready to switch out your boiler after reading our guide? First, we have a few helpful tips to ensure your installation goes smoothly.
Choose a qualified installer
Hiring a Gas Safe registered engineer for your boiler installation is essential. This is a legal requirement in the UK, but it also ensures that your installation is carried out as safely as possible.
JustFix’s boiler technicians are verified and accredited tradespeople and Gas Safe registered. When you book a boiler replacement with JustFix , you can rest easy knowing you’ve picked the best candidate for the job.
Prepare your home
Take some time to prepare your home before the boiler fitting. Clear the area around your old boiler (and the new installation site if you’re relocating your boiler) to give the engineers easy access and potentially speed up the process.
Discuss the details
Every installation is different, so the general timeframes in our guide might not apply to your setup. Having a detailed conversation with your installer about what the job will involve can give you a better understanding of the process and how long it will take. Ask your installer whether there might be any additional work that affects the expected timeframe.
Ask about warranty
Make sure you understand the warranty on your new boiler. Your warranty is a safety net in case you have problems with your installation later on.
At JustFix, we offer a 12-month warranty from the point of completion on any work our fixers undertake. When you book a boiler replacement with JustFix, you’ll know that whatever we fix will stay that way.
Keep on top of maintenance
Regular servicing is crucial for maintaining your boiler’s efficiency and longevity. A standard boiler service takes just 30 to 60 minutes and can prolong your boiler’s life by years.
Read our guides about how much a boiler service costs, what a boiler service includes, and how long a boiler service takes to get clued up on all things boiler service-related!
Book your boiler replacement with JustFix
Ready to make the switch? Booking a boiler replacement through the JustFix website or app couldn’t be easier.
Request a JustFix boiler engineer, and we’ll connect you with an accredited tradesperson in your area, providing you with a fixed price per hour. Tell us where and when you need a Fixer and a few details about the job at hand, then let us take care of the rest.
All work undertaken by our boiler engineers comes with a 12-month warranty, so you can have complete confidence in your boiler well after it’s been fitted.
FAQs about fitting a new boiler
When is the best time to fit a new boiler?
Unfortunately, if your boiler is broken or faulty, you won’t have the luxury of choosing when to replace it. However, if you can decide when to replace your boiler, opt for the summer months.
If the outside temperature is warmer, you’re less likely to miss heating and hot water for the hours or day(s) that it takes for your boiler installation to be finished.
How much does it cost to replace a boiler?
The cost of replacing a boiler can vary widely depending on several factors, including the type, size, and brand of the boiler, the complexity of installation, and whether additional work is required. On average, you can expect to pay between £1,500 and £3,500 for a boiler replacement in the UK.
How soon can I use my new boiler after installation?
You can typically start using your new boiler as soon as the installation is complete and the engineer has finished all necessary testing. This means that within a few hours of the installation, your home will have heating and hot water again.
Sometimes, the boiler might need to be registered with the manufacturer or local authorities, but this doesn’t usually delay its use. The engineer will handle this as part of the service, and you can begin using your new boiler immediately.
How often should a boiler be replaced?
Most boilers have a lifespan of around 15 years, but this can vary depending on the brand, age, usage, and maintenance. Check out our detailed guide to determine how long a boiler should last.
What happens to my old boiler?
Usually, when you get a new boiler installed, your installer will remove the old boiler from your home and dispose of it safely.
