Up to 3 years' interest-free credit on your new boiler 1

Spread the cost of your new boiler with £0 deposit - and relax with up to 12 years' warranty too.

Get a new boiler

Get your new boiler quote

Recommended Book a free home visit

Get a full heating survey and a personalised, fixed-price quote from one of our experts. They’ll find the perfect boiler for your home and budget - and help you get the most out of your new system.

Book now

Get an estimate online

Just need a like-for-like replacement? Answer a few questions to get an estimated quote online. We’ll ask for some photos and measurements to help us recommend the right boiler for you.

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Find the right boiler to install in your home

Combi Boilers

Combi boilers are the most compact boiler option, generating both your heating and hot water from a single unit. Great for small households with one bathroom.

Buy a combi boiler

Conventional Boilers

Also known as a ‘regular’ or ‘heat only’, these boilers are connected to a separate cylinder or water tank and are best suited to larger, older homes with more than one bathroom.

Buy a conventional boiler

System Boilers

Also known as ‘closed vent’ or ‘system sealed’ boilers. System boilers are best suited to larger homes with space for a hot water cylinder and good water pressure.

Buy a system boiler

Here’s why we’re the UK’s No.1 new boiler installer.

  • Over 200 years of experience

    And trusted in millions of homes across the UK

  • 6,500 expert

    So we’re always ready to install your new boiler

  • Up to 3 years' interest-free credit

    Spread the cost with £0 deposit and no hidden fees

  • Up to 12 years' warranty

    So if anything goes wrong. we’ll get it sorted

Spread the cost of your new boiler

Pay monthly

Get up to 3 years' interest-free credit with £0 deposit (0% APR). 1

Pay in full

Secure with a 10% deposit and pay the balance after installation.

All the best new boiler brands

From Worcester Bosch to Ariston, Vaillant and Glow-Worm, we have gas boilers for sale from all the top manufacturers.
And we’ll give you impartial advice to help you decide which is the best for you.

+ plus many more brands

What our customers think of us on Trustpilot

The Engineer was extremely efficient, courteous and very helpful. Explained relevant information concisely and clearly. Took less than the amount of time allocated and left no sign of his visit - other than our new boiler and Hive system.


Trustpilot 5 stars

Very happy with the service through out. Everything well explained and happend as informed. From the first time we had an issue with our old boiler to the last day of instalation of the new boiler. Very happy.


Trustpilot 5 stars

Great service both to the engineer and the second guy who did a quote for some work were extremely helpful, knowledgeable and professional. I used British Gas for a new boiler at my previous property and had a great customer service on both homes.


Trustpilot 5 stars

Frequently Asked Questions

How much does a replacement boiler installation cost?

With British Gas, boiler installation is always included in the price we quote. Whether you’re ordering your replacement boiler online or through one of our heating advisers, we’ll give you a quote that includes your replacement boiler and boiler installation. Our step-by-step guide to boiler installation has more details about what you can expect when you buy a replacement boiler from British Gas.

Not sure when you should replace your boiler? Our guide can help you to decide between a new boiler, boiler repair or boiler replacement.

Start your replacement boiler quote

How long does a replacement boiler installation take?

A new boiler installation usually takes 1-3 days. If your new boiler is the same type as your old one, it will be a simpler and quicker boiler installation than if your replacement boiler was a different type – for example, switching from a conventional boiler to a combi boiler. Moving your new boiler to a different place to the old one makes your replacement boiler installation slower than keeping the same type because it creates extra work like changing the pipework.

Confused about which type to go for? We can help you find the right new boiler type for you.

What happens during a new boiler installation?

Your boiler installation engineer will drain down your central heating and hot water system so that they can disconnect and remove your old boiler. They will then clear out your heating system to get rid of impurities in the pipework. Then they’ll start your replacement boiler installation, and once your replacement boiler installation is complete, they’ll talk you through your new boiler and system controls and show you how to use it. Our step-by-step guide to boiler installation explains everything in more detail.

What happens after my new boiler installation is complete?

When your expert boiler installation engineer has finished your new boiler installation, they’ll check that everything is working as it should be and then talk you through your new boiler and system controls and show you how to use it. Our step-by-step guide to boiler installation explains everything in more detail. Following your boiler installation, you might want to think about boiler accessories that could make it even more efficient, like Thermostatic Radiator Valves (TRVs).

We’ll also help you to keep your new boiler in top condition and working as efficiently as possible with up to 12 years’ warranty. That means that if anything goes wrong with your new boiler, we’ll be there to repair it – or to replace it for FREE if we can’t.

To keep your warranty valid, you’ll need to have your new boiler serviced annually. You can save yourself the hassle of remembering to book this in with HomeCare boiler cover packages, all of which include an annual boiler service at no extra cost.

When you take out HomeCare boiler cover, we’ll give you:

  • Unlimited call-outs for your new boiler
  • An annual boiler service
  • New boiler repairs that include all parts and labour

How do I accept my new boiler quote?

Whether you get your new boiler quote online or through one of our expert heating advisers, you can accept it there and then, or take some time to think about it. We’ll email you a copy of your new boiler quote and you’ll also be able to access it on our website. You can accept your new boiler quote online or call us to accept it. Once you accept your new boiler quote, you can choose a boiler installation date that’s convenient for you.

Can I speak to someone in person about buying a new boiler?

Of course! Our expert heating advisers are here to help you through every step of choosing and buying your new boiler. You can book a new boiler quote appointment for an expert to visit you at home at a time that suits you.

If you already have a new boiler quote, it’ll include the contact details of your heating adviser so you can get in touch with them directly to discuss your new boiler.

Alternatively, just give us a call on 0333 009 5784. Our advisers are available 9am-5pm, Monday to Friday.

Which new boilers does British Gas install?

We stock over 100 different new boiler models in our range, all produced by leading manufacturers like Vaillant, Worcester Bosch and Ideal. All our new boilers are chosen for quality, reliability and performance, and we have a wide range of new boilers that are suited to different sizes and types of properties.

How much does a boiler service cost?

The cost of a boiler service in the UK can vary. The price you pay for a boiler service depends on several factors, like the type of boiler you have, how old it is and where in the country you live.

It’s important to have your boiler serviced regularly because not only will doing so keep it in top condition and running as efficiently as possible, but your warranty may not be valid if you don’t.

At British Gas, we give you a choice of how to get a boiler service. You can either book a standalone single boiler service, sign up for an annual boiler service, or take out our HomeCare boiler cover which includes your annual boiler service at no extra cost.

  • £99 for a one-off boiler service with no ongoing committment
  • £7.75 a month for an annual boiler service contract
  • From £21 a month for HomeCare boiler cover

Book a boiler service

What is the cost of a new combi boiler?

The size of your home and the number of radiators you have will determine the cost of a new combi boiler. A new combi boiler for a small one-bedroom flat with only five radiators will cost much less than a new combi boiler for a large detached house with lots of bedrooms, bathrooms and radiators.

How efficient is my gas boiler?

The more efficient your boiler is, the more heating you’ll get for the money you spend on running it. Our guide to boiler efficiency explains this in more detail. And we’ve also got some tips to improve your boiler's efficiency.

Every new boiler we offer is A-rated for efficiency, and an energy-efficient new boiler could help you lower your gas bill – and cut your carbon footprint too.

Where can I find your new boiler Terms & Conditions?

Our full Terms & Conditions for buying a new boiler can be found here.

Additional information

  1. British Gas acts as a credit broker, not the lender and offers products from a panel of lenders. Payment options are subject to change without notice. British Gas is a trading name of British Gas New Heating Limited (No. 06723244), an appointed representative of British Gas Services Limited (No. 03141243) which is authorised and regulated by the Financial Conduct Authority (Financial Services Register No. 490568). Both companies registered in England and Wales. Registered office: Millstream, Maidenhead Road, Windsor, Berkshire SL4 5GD. Availability of credit depends on status and credit checks. Terms and Exclusions apply.