The Boiler Installation Process: What to Expect Step by Step

If your boiler is over 10-15 years old, struggling to heat your home, or costing more in repairs than it’s worth, it might be time for a replacement – something plenty of homeowners across Exeter and Devon are weighing up. Many people don’t know what’s involved in getting a new boiler installed, or how long it takes. That’s why our Gas Safe registered heating team has broken down the boiler installation process from start to finish, so whether you’re replacing an old system or fitting a boiler for the first time here in Exeter, you’ll understand every stage.

Thinking About Getting a New Boiler?

If your boiler is over 10-15 years old, struggling to heat your home, or costing more in repairs than it’s worth, it might be time for a replacement. But many homeowners don’t know what’s involved in getting a new boiler installed – or how long it takes.

That’s why we’ve broken down the boiler installation process from start to finish. Whether you’re replacing an old system or fitting a boiler for the first time, this guide will help you understand every stage – including how to get expert help from Home Exeter.

Step 1: Initial Consultation or Online Quote

The first step is to understand what kind of boiler you need and get a cost estimate. You can:

• Book a home survey with one of our engineers
• Or use an online boiler quote tool to get a fast estimate based on your home size and heating needs

This step helps determine:

• The right boiler type (combi, system, or regular)
• The correct boiler size/output (measured in kW)
• The installation complexity (like-for-like or conversion)

→ Get your free boiler quote from Home Exeter here

Step 2: Choosing Your Boiler

Once we’ve assessed your needs, we’ll recommend a few boiler options based on:

• Your home size and number of bathrooms
• Your hot water usage
• Your budget
• Your preference for certain brands (e.g. Worcester Bosch, Ideal, Vaillant)

We’ll always recommend energy-efficient, A-rated models with strong warranties and local support.

Step 3: Booking Your Installation Date

Once you’ve chosen your boiler, we’ll arrange an installation date that works for you. We aim to offer fast turnaround – often within 48-72 hours for urgent replacements.

We’ll also confirm:

• The cost (with a full breakdown)
• How long the installation will take
• What’s included (removal of old boiler, thermostats, controls, power flush if needed)
• Whether we need access to lofts, airing cupboards, or other areas

Step 4: Removal of Your Old Boiler

On the installation day, our qualified Gas Safe engineer will:

• Isolate the gas and water supply
• Drain and remove the old boiler
• Remove old pipework, tanks, or hot water cylinders if converting to a new system
• Dispose of all parts safely and responsibly

This step may also involve removing the old flue or ventilation system.

Step 5: Installing the New Boiler

Next comes the main part of the process – fitting your new boiler and connecting it to your existing system.

This includes:

• Mounting the new boiler (usually in the same location, unless otherwise agreed)
• Connecting it to gas, water and heating pipework
• Installing the flue (for safe removal of waste gases)
• Connecting any new smart thermostats or heating controls
• Running electrical work for ignition, display, and smart features
• Adding a magnetic system filter (optional but recommended)

The installation itself usually takes:

• 1 day for a like-for-like swap
• 2-3 days for a system conversion or complex upgrade

Step 6: Flushing the System (if needed)

If your radiators or pipes have built-up sludge or debris, the engineer may carry out a power flush or chemical flush. This helps protect your new boiler and improve heating efficiency.

It’s not always required, but it is strongly recommended for older systems.

Step 7: Testing and Commissioning

Once the boiler is fully installed, your engineer will:

• Test the boiler under pressure
• Check for leaks and carbon monoxide emissions
• Ensure it heats water and radiators properly
• Balance the radiators (for even heat distribution)
• Explain how to use the boiler and thermostat
• Set the heating schedules and flow temperature
• Register your boiler warranty with the manufacturer

They will also issue a Gas Safe certificate and provide all documentation for your records.

Step 8: Clean-Up and Aftercare

After installation, the engineer will:

• Tidy up the work area
• Remove all packaging and old parts
• Leave your home clean and safe
• Answer any final questions

Home Exeter also offers optional aftercare packages, including:

• Annual boiler servicing
• Extended warranties
• Emergency callouts for breakdowns
• Help with smart heating controls

How Long Does the Boiler Installation Process Take?

Here’s a quick guide to typical timescales:

We’ll always aim to minimise disruption and leave your home warm, clean, and comfortable.

How Much Does Boiler Installation Cost?

Here’s a rough breakdown of average prices (including labour and boiler):

For a more accurate price:

→ Get your free personalised boiler quote here

What Qualifications Should Your Installer Have?

Only use a Gas Safe registered engineer to install your boiler. It’s a legal requirement in the UK and ensures:

• Safe, compliant installation
• Manufacturer warranty protection
• Full certification and paperwork

All Home Exeter engineers are fully qualified, insured, and highly experienced in domestic and commercial boiler installations.

FAQs: Boiler Installation Process

Do I need to be home for the entire installation?
You’ll need to be available to let the engineer in and for the handover, but you can carry on with your day while the work is being done.

Can I move the location of my boiler?
Yes, but it may cost more depending on the pipework and flue location. Your engineer will explain your options.

What’s the best time of year to install a new boiler?
Summer and early autumn are ideal, as demand is lower and you’re not relying on heating as much.

Will I be without hot water or heating?
Yes – typically for a day or two. We’ll always aim to restore service as quickly as possible.

Does a new boiler improve energy efficiency?
Absolutely. New condensing boilers are over 90% efficient and can significantly reduce your energy bills.

Ready to Start the Boiler Installation Process?

If you’re thinking about replacing your boiler, Home Exeter can help. We offer:

• Fast, free boiler quotes
• Clear, fixed pricing
• Fully qualified Gas Safe engineers
• Friendly support from start to finish
• Great aftercare and servicing options

→ Get your boiler quote now

We’ll guide you through every step of the boiler installation process – and make sure you get the right system, at the right price, with zero stress.