If your old boiler is on its last legs or you’re looking to upgrade to a more energy-efficient model, you might be wondering: How long does it take to fit a boiler? While the exact time varies based on factors such as boiler type and installation complexity, here’s a general guide to help you understand what to expect.
I. Like-for-Like Boiler Replacement (4–6 hours)
If you’re replacing an old gas boiler with a new one of the same type and in the same location, the installation process is fairly straightforward. Since the existing pipework and connections are already in place, a Gas Safe registered engineer can typically complete the job within 4 to 6 hours.
Best for: Those looking for a quick upgrade with minimal disruption.
Example: Replacing an older combi boiler with a modern, energy-efficient combi boiler.
II. Changing from a Conventional to a Combi Boiler (1–2 days)
Upgrading from a conventional boiler system (which uses a separate hot water tank) to a combi boiler takes longer. This is because it involves removing the old system, adjusting pipework, and sometimes upgrading radiators or controls.
Timeframe: Typically 1 to 2 days.
Best for: Homeowners who want to free up space and improve energy efficiency.
Why upgrade? Combi boilers provide hot water on demand, meaning no need for a bulky water tank. Need more info? – What is a combi boiler?
III. Relocating the Boiler (1.5–2 days)
If you’re moving your boiler to a new location—such as from the kitchen to a utility room or loft—this will increase the installation time. An experienced plumber will need to reroute pipework, install new flues, and possibly make structural modifications.
Timeframe: Around 1.5 to 2 days, depending on the complexity.
Best for: Homeowners who want to create more space in a particular room.
IV. Installing a Completely New Boiler System (Up to 1 week)
If your home has no existing gas boiler (for example, if you’re switching from electric heating to gas), installation takes longer. New pipework, radiators, and possibly a gas connection need to be installed.
Timeframe: Several days to a week, depending on the property’s size and layout.
Best for: Those upgrading an old heating system or renovating their home.
What Can Affect Installation Time?
Several factors can influence how long a boiler replacement takes:
Boiler Type – Combi boilers are generally quicker to install than system boilers.
Existing Pipework – If your current system is in good condition, installation will be faster.
Home Size & Layout – Larger homes with multiple bathrooms may require more time for adjustments.
Additional Upgrades – If you’re also upgrading radiators or adding smart controls, this could extend the process.
Need a Boiler Replacement? Contact Complete Plumbing Today!
At Complete Plumbing, we specialise in efficient, high-quality boiler installations across Cork. Whether you need a simple swap or a full system upgrade, our Gas Safe registered engineers ensure a smooth, professional installation.
Get in touch today to book your boiler replacement and enjoy reliable, energy-efficient heating in no time!