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How Much is a New Boiler?

how much is a new boiler

If you’re wondering ‘how much is a new boiler’ then we have the answer.

On average, a new boiler costs between £1,500-£4,500. Including installation by a Gas Safe registered engineer.

We've researched the current prices of the most popular boilers on the market and balanced it with our many years working with a network of over 5,000 registered installers.

Here's what you need to know.

Finding the right boiler for your home

Before we get in to how much a new boiler could cost, you need to know what you’re looking for.

There are three types of boiler: combi, system and regular. And depending on the size of your house, one of these will be more suitable than the others.


Combi boilers are all-in-one heating systems. This means there’s no need for any additional tanks or cylinders. Great for homes that are tight on space.

Combis are the only boilers that heat water for taps, baths and showers on demand. Other boiler types store it in a cylinder. While this does mean you’ll be saving space, they can’t meet high demands for hot water in homes with 2+ bathrooms.

Ideal for homes with 1-2 bathrooms.


A system boiler is a great option for homes with 2 or more bathrooms. Domestic hot water is stored in a hot water cylinder which means that two bathrooms can be used at the same time without the pressure dropping. Plus, unlike regular boilers, a system boiler takes water from the mains so there’s no need for a cold water storage tank in the loft.

Ideal for homes with 2+ bathrooms and a high demand for hot water.


Regular boilers are the oldest type of heating system.

Don’t let that put you off though as modern regular boilers are reliable and efficient.

However, you should only be thinking about a regular boiler if your home already has one. This is because, as well as the boiler, you’ll also need tanks in the loft and a hot water cylinder. And a lot of pipework is needed to connect them all up.

So if you were to replace a combi boiler (Which doesn’t need a cylinder or any tanks) with a conventional boiler, it could take 3 or more days to complete. A like-for-like boiler replacement can be completed within a day.

Best suited to larger homes where a regular heating system is already fitted.

Find the right boiler for your home

Pick a house type from the list below to find a well suited boiler:

How much is a new boiler?

On average, a new boiler can cost £780 to £2,140.

But that all depends on the type of boiler, the manufacturer and the model.

The best boiler manufacturers are Alpha, ATAG, Baxi, Ideal, Vaillant, Viessmann and Worcester Bosch. So let’s take a look at how much a new boiler by them can cost.

Brand Combi boiler prices Regular boiler prices System boiler prices
Alpha £690 – £1,033 £710 – £810 £788 – £983
Baxi £549 – £1,307 £663 – £991 £711 – £1,011
Ideal £714 – £1,323 £712 – £2,796 £785 – £1,201
Worcester Bosch £730 – £2,475 £814 – £2,300 £899 – £2,209
Vaillant £907 – £1,703 £792 – £1,533 £894 – £2,264
Viessmann £800 – £1,600 £845 – £1,200 £995 – £1,650

So if you buy a boiler from one of these manufacturers then it’s likely to cost somewhere between £700 and £2,000. But it is possible to find them for as little as £550.

Looking to save as much money as possible? Then take a look at the best cheap boilers.

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Now onto the installation costs

You’ll need a Gas Safe registered engineer to fit your new boiler. And that means adding installation costs on top of the price of the boiler.

Installation costs will vary based on the installer’s rates and the amount of work involved. And that’s why we recommend comparing quotes from at least 3 companies. You can get free quotes from up to 3 boiler installers near you today.

Like-for-like condensing boiler replacement

Replacing a condensing boiler with a new condensing boiler (in the same location) is one of the simplest boiler installations.

As well as replacing the boiler, the installer should also perform a powerflush. A powerflush involves chemicals being flushed through the pipes to clear out any rust, limescale and other bits of debris. This can add anywhere between £300 and £1,000 to the costs of installing a new boiler.

Replace a non-condensing boiler with condensing

By law, all new boilers must be condensing.

So, if you have a non-condensing boiler then your next boiler must be condensing. And it’s well worth the upgrade as they’re more efficient, reliable and far safer.

In this case, additional costs will involve a powerflush, moving the flue and rerouting the pipework. All in all, this could land you with additional costs of £1,100 to £1,560.

New condensing boiler in different location

Moving a boiler will add to the installation costs. That’s because new pipework will be needed, the flue will need to be moved and a condensate drain fitted.

Then there’s the additional cost of a powerflush or chemical flush.

So, that’s an additional £1,500 to £2,300.

Replacing a regular boiler with a combi

Switching boiler types is a big job.

On the whole, it’s recommended to stick with the same boiler type when replacing your boiler. However, if your demand for heating and hot water changes over time then it can make perfect sense.

Regular boilers are the oldest type of boiler. As well as the boiler, you need tanks in the loft and a hot water cylinder.

This is unlike a combi boiler which has everything it needs within the boiler itself. That means no tanks or cylinders!

So if you’re looking to save some space then a combi is the way to go. But a system boiler could be your best bet if you have 2 or more bathrooms.

To replace a regular boiler with a combi, the system needs to be converted from open-vent to sealed. The old cylinder and tanks in the loft also need to be removed.

Additional installation costs can reach up to £2,800.

You can learn more in our guide to new boiler replacement & installation costs.

Additional installation costs

Often it is not as simple as installing a new boiler, hitting the on button and forgetting about it. Depending on the existing system you have in place and how old it is, a competent installer may well recommend extra work to ensure your new heating system works to its full capacity.

This may include some of the following services:

  • Moving the boiler to a new location
  • Removing old equipment (storage cylinders or water tanks)
  • Adding or replacing radiators
  • Mechanical / chemical flushing of pipework (recommended)
  • Installing thermostatic radiator valves
  • New thermostats and smart programmers
  • Ongoing annual aftercare / servicing plan

Make sure you ask for an itemised quote from your installer as prices for these services can vary considerably between installers. You can then ensure you are comparing like for like and make sure you're getting both a quality service and a competitive deal.

Boiler Guide can provide you with up to 3 quotes from Gas Safe registered and reputable installers. All you need to do is complete our quick and simple enquiry form and we'll be in touch in a matter of hours to help you get the most competitive price for your new boiler.

So, how much is a new boiler with installation?

To purchase a new boiler and have it installed you are looking at an overall cost of between £1,500 – £4,500.

Get tailored quotes for your replacement boiler by completing our simple enquiry form today. We will be in touch in a matter of hours to confirm your details and boiler requirements before putting you in touch with up to 3 reputable installers in your area.

How much a new boiler could save you

When faced with a substantial upfront cost, like a new boiler, it's important to consider the long term benefits. The main benefits in this case being improved energy efficiency which will deliver both lower energy bills and reduced carbon emissions. The efficiency of a boiler represents the money you are wasting on lost energy. For example, if your boiler is only 70% efficient, you are losing 30p of every £1 you spend on your energy bills to wasted energy.

By installing a new A-rated, gas condensing boiler with a programmer, thermostat and TRVs in place of an older boiler with a programmer and thermostat, you should be able to achieve efficiency of 90% or higher. To illustrate what this means in the long term, you could make the following annual savings on your energy bills:

Old boiler efficiency rating Bungalow Flat (mid-floor) Mid-terrace house Semi-detached house Detached house
78-82% D £90 £45 £95 £110 £135
74-78% E £100 £50 £105 £125 £165
70-74% F £110 £55 £120 £140 £210
<70% G £155 £80 £170 £195 £300

These figures have been taken from the latest research by the Energy Saving Trust using fuel prices in June 2021. Savings will vary depending on the size and thermal performance of your home.

Installing a new A-rated boiler could save you between £71.25 and £225 on your annual heating bill but savings could be as high as £300.

How to pay for a new boiler

For many, the prospect of paying for a boiler installation in one lump sum is not affordable. But there is hope!

There are a variety of finance options available to help you spread the cost over a period that suits you through affordable payment plans. If you think boiler finance could be the best choice for you, visit our Boiler Finance page for more information.

The best place to start is by getting quotes from at least 3 installers. Comparing multiple quotes will put you in a great position as you can be confident that you won’t be overcharged.

And you can get free quotes from up to 3 installers near you right here on Boiler Guide.


About the author


Adam is our resident home heating expert. His experience and advice has helped millions of customers improve the efficiency of their homes and save money.

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