A Day-by-Day Breakdown of a New Boiler Installation

Thinking about a new boiler installation but not sure what actually happens? You’re not alone.

At KD Jones Heating Engineers, we speak to plenty of customers who know they need a new boiler, but they’re worried about disruption, mess, or just not knowing what to expect.

This blog walks you through the typical process of getting your boiler replaced, from first visit to final test. It’s not as scary as you might think, and in most cases, you’ll be back up and running in just two days.

Before Day One: Choosing the Right Boiler for Your Home

Before installation begins, we help you choose the boiler type that best suits your property and lifestyle. The three main types of boilers are:

• Combi boilers – Great for smaller homes with no need for a separate hot water tank
• System boilers – Ideal for households with high heating and hot water demand
• Conventional boilers – Best suited to older homes with existing hot water cylinders and cold water tanks

The best boiler for your home depends on things like water pressure, the number of bathrooms, and how much hot water you use daily. We’ll guide you through every option so you’re confident before we start.

Day 1: Safe Removal and Preparation

The first step of any new boiler installation is to safely disconnect and remove the old boiler. If it’s a straight swap (same location, same boiler type) this part is simple.

But if we’re upgrading your central heating system (for example, switching from a conventional boiler to a combi), we may need to reroute pipework or make space for new components. In these cases, we’ll:

• Cap off unused pipes
• Disconnect your old hot water cylinder or tanks
• Remove any redundant controls like old room thermostats and thermostatic valves

We’ll also protect your floors and tidy as we go, so you can expect no muddy boot trails from us!

Day 2: Installing the New Boiler and Controls

With the old system out of the way, we’ll install your new boiler in the chosen location. We also fit any smart controls or upgrades you’ve chosen, such as a programmer, room thermostat, or thermostatic radiator valves (TRVs).

Depending on the type of boiler and location, this part can take 4–8 hours. Our engineers ensure:

• Safe connections to gas, water, and electric supplies
• Correct pressure and flow checks
• Configuration of your heating system settings
• Setup of any new controls

Before we leave, we test the boiler thoroughly and explain how everything works. You’ll get full documentation, warranties, and a Gas Safe certificate.

What If It Takes Longer?

Most installs are completed within two days, but it can vary depending on:

• The size of your property
• Whether your system needs upgrades
• Whether your boiler location is changing
• If you're claiming a boiler upgrade scheme or grant (which can add admin time)

We always give you a realistic timeframe and keep you informed if anything changes.

How Much Does It Cost for a New Boiler?

There’s no one-size-fits-all answer to how much does it cost for a new boiler, as the boiler price depends on:

• The make and model you choose
• The complexity of the installation
• Whether you’re upgrading your system
• Extra features like smart controls

In most homes, the total cost to buy a new boiler and have it installed ranges from £2,000 to £3,500. But we’ll give you a fixed quote before we start, so you can rest easy knowing not to expect any surprises or hidden fees. Take a look at our quick boiler estimate page for a more detailed breakdown.

Will a New Boiler Save Me Money?

Absolutely. A modern condensing boiler can reduce your energy bills significantly. Combined with better controls and zoning, you’ll use less fuel to stay warm. That’s better for your wallet, and the planet.

We’re also happy to advise on the best options for UK homeowners exploring low-carbon heating, and explain how certain homes may qualify for government-backed boiler upgrade schemes.

Ready to Book Your Installation?

If you’re considering a new boiler installation, we’re here to make it simple and easy. From your first phone call to the final test, we keep things tidy, timely, and tailored to your needs.

📞 Call us on 01737 211376

🌐 Visit our contact page to request a quote online

📍 Based in Redhill, we cover homes across Surrey and the surrounding areas

We’re Gas Safe and OFTEC registered, and proud to be Worcester Bosch Accredited Installers.

FAQs

1. How long does a new boiler installation take?

Most are completed in 1–2 days, depending on the type of boiler and your existing system.

2. Will I have heating and hot water during installation?

No, but we minimise downtime as much as possible and usually restore service the same day.

3. Can I switch from a system boiler to a combi?

Yes, but it may involve removing tanks and updating pipework. We’ll advise if it’s suitable.

4. Do I need to be home during installation?

You’ll need to be there at the start and end, but you don’t need to stay the whole time.

5. Is it messy?

We use dust sheets, shoe covers, and tidy up thoroughly, so there’s no mess left behind.

6. Do I get a warranty with my new boiler?

Yes, up to 12 years, depending on the model. We’ll register it for you.