Compare new boilers and installation costs
With energy prices still high, save up to £840‡ per year and increase your home's energy efficiency by installing a new boiler.
TrustScore 4.7 | 30,268 reviewsGet new boiler quotes from trusted UK brands
Whether you want reliability, affordability or efficiency, you can choose exactly what you need with our wide range of boiler options.
Alpha
Glow-worm
Ideal Heating
Vaillant
Viessmann
Worcester Bosch
Glow Green
TrustScore 4.6 out of 5 |
10,491 reviews
Up to 12 years
Yes
0% APR over 2 or 4 years
Lowest Price Guarantee*
Flexible payment plans
£100 off select boilers + free boiler service worth £95.88*
Heatable
TrustScore 4.8 out of 5 |
11,851 reviews
Up to 12 years
Yes
0% APR over 4 years
Next day installation
Flexible payment plans
Up to £200 scrappage discount against your old boiler*
British Gas
TrustScore 4.8 out of 5 | 10,254 reviews
Up to 12 years
Yes
0% APR over 3 years
£0 deposit options
Multiple payment options
Get up to £200 off Viessmann boilers. Offer ends 24/07/25*
iHeat
TrustScore 4.8 out of 5 |
8,870 reviews
Up to 12 years
Yes
0% APR over 2 years
Next day installation
Flexible payment plans
Special offer for Uswitch customers
FREE Honeywell T6R Smart Thermostat
Code: USMART
What are the benefits of installing a new boiler?
As well as getting a new boiler that you can trust, you’ll also benefit from:
Lower energy bills
New boilers are more efficient than older ones, maximising value for money and reducing your gas and electricity bills.
Increased efficiency
Help your own pocket and the environment by upgrading to a more eco-friendly boiler.
A modern appliance
Thanks to smarter technologies, new boilers are smaller, quieter, and more advanced.
What factors affect the cost of a new boiler?
Finding a new boiler can seem daunting, but it’s not as stressful as you might think.
When you’re considering your options, it’s essential you know which boiler will be most suitable for your home. Make sure you consider the following things when weighing up your options.
Boiler output (in kW)
The right one will depend on your home and heating needs. Too small and it might not be up to the job, too big and you’ll waste energy you don’t use.
Energy rating
To get the most out of your money, you need an efficient boiler. Look for the ones with the highest rating, A, to save money on bills and reduce your carbon footprint.
Cost
Before buying, consider the upfront and installation costs. Some companies even offer finance options to make paying more affordable.
Size
This is important in terms of the physical size of the boiler and the space it needs to fit into, but also in terms of its power in kW. The general rule of thumb for boilers is that the more heat you need (including to heat water), the higher the kW boiler you'll need.
Features
You need to find a boiler that works with you, so look for ones with smart thermostats and controls to manage your usage.
Brand reputation and warranty
Choose a reputable brand with good reviews, reliable performance, and longer warranties to ensure peace of mind. At Uswitch, we only partner with the most trusted manufacturers, so you can relax knowing you’re getting the best for your home.
What boiler grants are available?
There are a few boiler grants available from various places. The government’s Boiler Upgrade Scheme offers £5,000 towards the cost of installing a biomass boiler, while energy suppliers are obligated to offer energy-efficient boiler grants to those who need them under the Energy Companies Obligation scheme. To check if you’re eligible, get in touch with your supplier.
“If you're getting a new boiler, try and get one that has an energy efficiency rating of "A". This will help ensure the boiler’s heat, and your money, doesn’t go to waste because less energy will be lost when the boiler is being used.”
How does new boiler installation work?
Before the installation
You can get quotes online or by booking appointments with installers to visit your home. You'll probably need to provide information about the size of your home, your current boiler and your energy usage. The quotes you receive should, at a minimum, include the cost of the boiler itself and the work needed to install it.
On the day of the installation
Boiler installation usually doesn't take more than a day unless the work is more complicated (which can be due to the location of the boiler and whether the boiler is a different type to the one being replaced). You should also get a full run-through of the controls so you can use the new boiler safely.
After the installation
You should be able to use your new boiler instantly. It's important to ensure you book in annual servicing so you can always be certain the boiler continues to work effectively. This may also be a condition of warranty, so don't put it off. Most people organise theirs during the summer in preparation for the winter months.
What are the different types of new boiler?
The main types of new boiler you’ll come across are:
Combi boilers
Combi boilers provide heating and hot water on demand, heating water whenever the hot tap is turned on. This means they don’t need separate hot water cylinders or tanks to store cold water, which saves lots of space.
Combi boilers are typically found in small to medium-sized homes. Because they only heat water when needed, they are more energy-efficient than other types of boilers.
System boilers
These boilers feature hot water cylinders, which are typically kept in airing cupboards. System boilers are connected to central heating and store hot water in the cylinder for later use.
The cylinder means system boilers are ideal for larger homes with multiple bathrooms because they can feed multiple taps and showers without affecting the water pressure.
Conventional boilers
Also known as regular or heat-only boilers, these need a hot water cylinder and a cold water storage tank (usually kept above the boiler in the loft).
These boilers are best for homes with a high demand for hot water; however, they do take up lots of space.
How much does a new boiler cost?
New boilers vary in cost depending on factors like the type and make of the boiler and the company that installs it.
The average costs of boilers and boiler installation are:
| Boiler type | Cost including installation |
|---|---|
| Combi boiler | £1,500 - £4,500 |
| System boiler | £1,580 – £5,000 |
| Conventional boiler | £1,600 – £5,000 |
The costs might seem high, but if you’ve had your current boiler for more than 10 years, it won’t be nearly as efficient as a new one.
So, with the money you’ll spend upgrading your current system, you’ll save a noticeable difference each month on your energy bills, which essentially offsets a good chunk of the initial cost.
How long does it take to install a new boiler?
There’s no set answer for this. Boiler installation times can vary depending on the type of boiler, gas safety requirements, and the complexity of the installation itself.
Generally, new boiler installations can take anywhere between four to six hours up to a couple of days, but your engineer will be able to give you a more accurate estimate once they know the scope of the job.
What are the signs I need to replace my boiler?
Generally speaking, a well-maintained boiler can last up to 15 years, but if yours has passed the 10-year mark, it’s probably not as efficient as it once was and it could be time to upgrade.
If your boiler isn't quite at that age, there are some signs it might be time to say goodbye, including:
- If it breaks down frequently
- If you’ve noticed your heating bills have gone up
- If it’s taking longer to heat water than normal
- If it’s making strange noises
- If it’s leaking water
- If you notice odd smells* coming from the boiler
Not all of these issues mean you need to replace your boiler. An engineer can solve some problems, but if they persist over a longer period of time, you may need a new boiler.
*If you can smell gas, call the National Gas Emergency Service immediately on 0800 111 999. Gas leaks are incredibly dangerous, and mustn’t be ignored.
How can a new boiler help reduce my carbon footprint?
Making your heating system as eco-friendly as possible is kinder to the planet and your wallet. So it’s a win-win.
These four things can help you reduce your carbon footprint when you buy a new boiler:
- Choose an energy-efficient boiler
A boiler's efficiency relates to the amount of energy it uses when it comes to heating water.
If a boiler’s 95% efficient, this basically means that for every £1 you spend on heating, you lose 5p.
When shopping for a new boiler, check the ErP rating. This rating, which is on a scale from A (highest) to G (lowest), rates how efficient a boiler is. All modern boilers sold in the UK must be A-rated.
- Consider renewable options
Heat pumps are a sustainable alternative to boilers. They extract heat from the air or ground and use it to warm your house.
Likewise, biomass boilers use organic materials like wood pellets to heat your home, reducing your reliance on fossil fuels.
Finally, you could choose to switch to a green energy tariff. This means you’ll power your house using energy that is generated from natural and renewable sources that don’t harm the environment.
By using green energy, you can rely less on the national grid and still use a conventional heating system, like a combi boiler.
- Install smart controls
Smart controls, like smart thermostats and thermostatic radiator valves, give you greater control over your heating, ensuring you only use it where and when you need it.
- Get a service plan
Many people see their annual boiler service as an unnecessary expense, but this isn’t the case. Regular maintenance ensures your boiler is running efficiently, reducing fuel waste and prolonging its life.
Boiler efficiency ratings: what do they mean?
A boiler's efficiency relates to the amount of energy it uses when it comes to heating water.
For example, if 95% of the energy used heats the water, this means that 5% is lost, which would represent an energy-efficient boiler. However, a boiler that loses 40% of its energy would not be very energy-efficient.
Considering that you pay for 100% of the energy used regardless of how much is wasted, it's wise to ensure your boiler is as energy-efficient as possible.
What do boiler efficiency ratings mean?
Boilers are rated according to the ErP or SEDBUK systems.
ErP is the European rating system for boilers, rating their efficiency from A to G. All UK modern gas boilers are legally obligated to be A-rated - i.e. as efficient as it's possible to be.
SEDBUK is the same rating system but it adds exact percentage scores to each boiler for extra detail.
Looking for something else?
Boiler cover
Compare boiler cover deals from leading providers and ensure you’re covered if anything goes wrong.
Boiler repairs
Get your boiler repaired by a local, Gas Safe-registered British Gas engineer.
FAQs
How much should a new boiler cost?
A new boiler can cost anywhere between a few hundred pounds to a few thousand. Prices vary depending on the type of boiler and the system it's being installed into, but every installer will have a slightly different price. You should a range of quotes if possible.
What will replace gas boilers after 2025?
The reason gas boilers are being banned in new build homes is so alternative, low-carbon heating systems can be adopted. Ultimately, these homes will still use boilers, but they'll be powered by renewable energy rather than gas. For instance, it's likely there'll be a focus on installing air and ground source heat pumps which use renewable natural heat.
Are boilers expensive to replace?
Boilers can potentially cost thousands to replace so it's more cost-effective to service them regularly to prolong their lives. That only works for up to 15 years, though - it's recommended that boilers are replaced once they turn 15.
How much will a new boiler save me?
The amount that a new boiler will save you depends on the efficiency of the boiler you’re replacing and the amount of energy you use. When you take into account the discount you receive when you go get a new boiler through Uswitch, you could save up to £840 per year.
How do I get a new boiler?
The easiest way to get a new boiler is to compare the options available from various suppliers through Uswitch. We have exclusive discounts that can’t be found anywhere else, and it could take you minutes to find your new boiler with us.
How long should a new boiler last?
A new boiler is a significant expense, so it should ideally last as long as possible before you have to replace it. The minimum lifespan should be ten years, with well-serviced boilers lasting as long as 15 years.
How much value does a new boiler add to a house?
The actual amount a property’s value will increase by is never guaranteed, but it is estimated that homeowners can add an average of 4% to their home’s market value by installing a new boiler. In fact, it’s actually one of the best purchases you can make in terms of ROI!
When does a new boiler need servicing?
You should get your boiler serviced for the first time when it’s close to a year old, depending on when the warranty ends.
If you’re a landlord, it’s a legal requirement to have all boilers you’re responsible for getting it serviced by a Gas Safe registered engineer at least once a year.
Why does my new boiler keep losing pressure?
When boilers begin to lose pressure, it’s a sign of age – a new boiler shouldn’t be losing pressure. If it is, book an urgent service from a Gas Safe registered engineer.
Why is my new boiler so noisy?
A new boiler shouldn’t be making excessive noise – if it is, there’s probably been an issue with the installation, or there could be a problem with your home’s internal heating system.
If your boiler’s making a noise, book a service with a Gas Safe registered engineer as soon as possible.
Is a power flush necessary when installing a new boiler?
Technically, a power flush isn’t necessary when installing a new boiler, but removing the deposits of limescale and sludge that build up over time, will help the system run as efficiently as possible from the outset. Many engineers strongly recommend it, but they usually make it optional.
Is it worth getting a new gas boiler now?
It's up to you whether you get a new gas boiler now. You won't be cut off from your gas supply when the gas boiler ban comes into force because it only applies to new-build homes. However, if you can afford to, it might be worth looking into renewable heating sources like ground or air source heat pumps.
‡ Estimated saving for a gas-heated detached house in England, Scotland and Wales, when replacing an old G-rated gas boilers, programmer and room thermostat with a new A-rated condensing boiler, programmer, room thermostat and thermostatic radiator controls (TRVs). Savings will vary depending on the size and thermal performance of your home. Source: https://energysavingtrust.org.uk/advice/boilers/
*Glow Green Terms and Conditions
Terms and conditions apply. See Glow Green Lowest Price Guarantee, Glow Green Boiler Terms & Conditions.
All Uswitch customers are eligible for an exclusive free 1st year boiler service and heating health check upon installing a new boiler with Glow Green. To claim your free Boiler service and Heating Health check you must sign up to Glow Care 100 or 300 when you place your order. You will not be charged for the first 12 months, and payments will start from month 13 onwards.
All Uswitch customers are eligible for a further £100 discount which is applicable for all boiler installations featuring the Vaillant EcoTEC Plus or Worcester Bosch 4000 series product ranges. The discount will be applied when you place your order and will be taken off the Total Sale amount. This will be displayed as a discount on your invoice.
*Heatable Terms and Conditions
*Scrappage discounts are generated upon entry of existing boiler model or serial number. Discounts can only be applied against the cost of a supply and installation booking through Heatable and cannot be used in addition to other codes or product promos. Discounts can only be deducted off the total cost and cannot be exchanged for products, services or monetary value. Scrappage discounts can still be used with installation bookings offering finance packages
Terms and conditions apply. See Heatable New Boiler Terms & Conditions.
Free Hive Mini smart thermostat for all customer purchases of a new boiler installation via Uswitch link. Code must be used prior to payment and cannot be retrospectively claimed. Code cannot be used in conjunction with other offers, codes or service promotions. Free product cannot be substituted for alternatives, price reduction or cash value.
*iHeat Terms and Conditions
Terms and conditions apply. See iHeat Terms & Conditions.
Free Hive offer is valid for all orders and must be redeemed by using the code ‘HIVEMINI’ during the booking process. This code cannot be used together with any other codes or promotions. The code cannot be claimed after the installation has been completed.
British Gas Terms and Conditions
[1] This offer is available to all customers who (i) purchase a new Viessmann boiler online on or before the Closing Date or (ii) book an appointment on or before the Closing Date for an in-home visit that results in the purchase of a new Viessmann boiler. In-home visits and installation of the boiler can be completed after the Closing Date. The discount will be deducted from the price of the boiler (including VAT) as specified on your quotation. Subject to availability. Closing Date: 24th July 2025.
[2] Your price will only change if we later discover additional work not specified in your quote is needed (e.g. scaffolding or building/electrical work). We would agree any price changes with you before starting the installation work. Please refer to Central Heating T&Cs
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.
Our services are provided at no cost to you. We may receive a commission from the companies we refer to you, but this does not affect what you will pay for the product you choose.
