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New Boiler Replacement Prices & Installation Costs

Adam Cherry
By: Adam Cherry
Updated: 13th April 2022

Boiler Replacement Costs
First of all, before we get ahead of ourselves. We are very conscious that a boiler replacement due to a breakdown can be very stressful and is, most likely, something you will want to resolve quickly. If you're looking for a local professional to install a new boiler for you as soon as possible, simply click the following link and get free comparison quotes and boiler prices.

For anyone that's not desperate to get a new boiler ASAP, there are quite a few things you'll want to consider - How much does a new boiler cost? What’s the best boiler brand? What type of boiler do I need? Where can I find the best boiler prices? To put it simply, you could probably do with a bit of expert advice.

Fortunately, here at Boiler Guide we spend our waking hours researching and reviewing everything boiler related. Leave it to us and we’ll provide you with everything you need to know to make the right decisions and have a good idea of what to expect when it comes to the all important cost of a new boiler installation.

Do you need a boiler replacement?

Blink and Blaze
It's not always clear whether your boiler needs replacing or repairing. If it is billowing smoke, making strange banging noises and refusing to switch on it's probably pretty obvious that a new boiler is what you need. In which case, we would highly recommend getting boiler replacement quotes as soon as possible by clicking the link below.

There are, however, other, less dramatic signs that you need a new boiler. As well as some other things to consider that may help you to answer the question "Do I need to replace my boiler?".

It could save you money

  • Financially. Depending on how much a boiler repair will cost and how often you've had to get your boiler repaired, it could make sense to bite the bullet and replace your boiler with a new one. It's a good idea to ask yourself the question "Will the cost of a boiler replacement actually save me money in the long run?". If the answer is yes, investing in a new boiler would undeniably be the best course of action.
  • Your boiler is getting on a bit. The years creep up on the best of us. While boilers have an average lifespan of 10-15 years, if your boiler was installed over 8 years ago it's likely that it has lost some efficiency. In which case, it may be best to replace it before it breaks down. It’s very rare for a new replacement boiler to have any issues and even if it does, you’ll be covered by the manufacturer's warranty.
  • It pays to be efficient. Depending on its age, your old gas boiler is likely to have a low energy efficiency rating (not A-rated) and may only be reaching 50-70% efficiency which could be dramatically increasing your energy costs. New A-rated boiler models have to be at least 92% efficient by law, and evidence suggests that replacing an old G-rated boiler with an A rated boiler could save you up to £580 every year* (not to be sniffed at).
  • Better for the environment. A new A-rated boiler also wastes less fuel and will lower your home's carbon emissions, reducing your impact on the environment.

It could make life easier

  • Location location location. Some boilers are placed in annoying parts of the house and moving a boiler can be surprisingly expensive. Sometimes, it’s a lot less hassle to upgrade your boiler to a more energy efficient model and put it where you want it (within reason of course). Depending on your needs, a new boiler can even be tucked away in a cupboard to free up space.
  • Size does matter. If your boiler is not producing enough hot water to heat all your radiators while allowing you to enjoy a relaxing soak in the tub. You’re going to need a boiler with a higher output and/or a hot water cylinder.
  • If you are planning to sell or rent your property. An A-rated boiler should improve the energy rating of your home which can make it more attractive to potential buyers or tenants.
  • Take control. Thermostats have come a long way in recent years. Pair your new boiler with these swanky smart gadgets and you'll be able to control your central heating at a flick of the button anywhere in the world – saving energy and money.Not only are we a bit obsessed with boilers, we know a thing or two about thermostats too – we’ve even compared some of the best thermostats, so you don't have to.
  • A quiet place. Old boilers have the tendency to be rather noisy and may even make strange banging noises, if they're on the way out. With a new boiler, you won’t even know it’s there while it’s filling your home with wonderful warmth. Look out for a 'Quiet Mark Accreditation' when comparing new boilers as these are guaranteed to be amongst the quietest range you can buy.Talking of comparing boilers – we have a snazzy tool that can help with that. We call it our boiler comparison tool.

It could make your home safer

  • Danger! As your boiler gets older there is a greater risk of a gas leak or exposure to carbon monoxide. Remember that even new boilers should be maintained and serviced every year by a Gas Safe engineer. Just like a car, your annual inspection will make sure your boiler is working effectively, efficiently and safely. We've got some extra advice on boiler servicing here.

If any of the reasons we've mentioned for getting a new boiler have resonated with you, it could be worth getting some free no-obligation boiler replacement comparison quotes by clicking the link below.

How much does a boiler replacement cost?

Blink Boiler Replacement Costs

Aha, so now we've warmed you up (sorry), let's get down to the nitty-gritty and the all important cost of a replacement boiler.

Admittedly, replacing a boiler generates little 'buyers buzz.' It can't compare to a new car or that new jacket you've had your eye on for ages – a new mop delivers more of a punch… BUT a working, efficient boiler is a necessity and is going to keep you warm for the next decade, so making the right choice is vital and cost plays a big part in this.

Getting a new boiler is not one size fits all, and costs will vary depending on what you need. It's definitely not as simple as comparing a cheap boiler replacement to an expensive one.

Compare new boiler prices

To help you weigh up your options, we’ve provided some potential costs of a new gas boiler in the table below. The figures are based on averages for a 3-bedroom home and can change based on a number of factors. Firstly, there’s the type of boiler being installed. There is a huge range to choose from and prices start from as little as £400 and go up to £3,000.
Secondly, when investigating the potential cost of a new boiler you’ll need to think about the cost of the installation. Just like the cost of the boiler, rates charged by heating engineers will also vary.

Installation costs can be affected by:

    • The type of boiler being installed (Like-for-like will cost less than a complete change of heating system)
    • Whether you are moving the boiler to somewhere else in the house
    • Installer rates (London installers are likely to be more expensive)

Boiler Installation Cost Comparisons

Boiler type Average cost of boiler excluding installation Average labour cost of boiler installation Approximate total cost of boiler fully installed
Combi £500 – £2,000 £500 – £1,000 £1,000 – £3,000
System £500 – £2,500 £500 – £1,000 £1,000 – £3,500
Conventional £500 – £2,750 £500 – £1,000 £1,000 – £3,750

Remember, the above is based on our best estimates and just as you would with any investment, getting quotes from multiple installers is a must. It's also important to remember to only ask for quotes from Gas Safe registered engineers. Fortunately, we can help you with that. To get up to 3 quotes from Gas Safe registered engineers completely free of charge, you can click the link below and we'll do the rest.

We've got some more detail here about what's involved in boiler installation. You can also find out how much it could cost with our Boiler Installation Calculator.

How to choose a new boiler

Blink Shocked
When choosing your new boiler you'll need to know the type of fuel your boiler runs on; the boiler type that will suit your home; and the most suitable boiler size/output rating for your heating and hot water demands (remember that relaxing bath we spoke of earlier).

Finding out which fuel your boiler uses

Most homes in the UK run their boilers on natural gas, but there are many who are unable to be connected to the National Grid and rely on oil, liquefied petroleum gas (LPG) or electricity to power their homes. If you have gas you'll have an energy supplier and pay regular bills, if you're off-grid with LPG you'll have your fuel delivered to you, which is stored in a tank outside.

An electric boiler looks a bit like a gas and oil boiler, but they don't burn fuel. They also don't need a flue pipe (a pipe which expels waste gases away from the property) making them easy to identify.

If you're unsure which fuel your boiler runs on, then you will be able to find out in the paperwork that came with your boiler. Alternatively, a fully-qualified heating engineer will be able to let you know.

Choosing a boiler type for your home

Next up is making sure you choose the correct boiler and you've got 3 to choose from:

It's all down to the size of your property and what your demand for hot water and central heating is. There are pros and cons to all 3, so you'll have to think about these with the help of a heating engineer before you make your decision.

Combi boilers

Combi Gas Boiler
A combi boiler heats water from the mains and circulates it directly to either the central heating system or hot water outlet as and when you want it. Combi boilers are ideal for homes with 1 or 2 bathrooms. While a combi boiler may struggle to cope with demand in larger properties, they are very cost-effective and have risen to the top of the boiler charts becoming the most popular boiler type in the UK.

We've got loads more detail on combi boilers here.

System boilers

System Gas Boiler
A system boiler heats water directly from the mains, like a combi, but instead of delivering it instantly to the tap, it is stored in a hot water storage cylinder. This removes the need for any tanks in the loft and means that they can deliver hot water to multiple taps or showers at the same time.

Need to up your knowledge on system boilers? – Have a look at System Boilers Explained.

Conventional boilers

Regular Gas Boiler

Conventional boilers (also known as regular, heat-only or open-vent), pre-date both combi and system boilers. They are typically found in older homes, but modern models are available.

Conventional boilers are supplied from a cold water cistern that lives in the loft. An expansion tank sits next to the cistern and keeps the correct level of water in the heating system at all times. An important job, as water expands when heated.

To get your central heating firing, cold water is delivered to the boiler (via good old gravity) which then heats it up and circulates it to the radiators. For your hot water, cold water travels down to a cylinder where it waits until it's needed to be heated up.

Conventional boilers are not short on parts so you'll need plenty of room to fit them all in. Conventional boilers are only really recommended for homes that already have the right pipework in place.

Considering conventional? You can broaden your comprehension with our What is a regular boiler? article.

Choosing a boiler size

Boiler Size
Boiler size is more commonly known as the output rating not the physical size of your unit. It's really important to get this right when you're looking for a replacement boiler.
Output rating is measured in kilowatts (kW) and the higher the output rating – the more powerful the boiler.

Don't confuse more power with being better however, as you need to choose an output rating that is suitable for the demands of your home.

An output rating that's too low won't be able to meet the demand, while you could see your heating bills rise if the output rating is too high.

The available output can vary depending on the boiler type (e.g. combi, regular or system). However, the best way to determine the right kW size for your home is to allow 2kw for each radiator. For example, if you have 10 radiators you will need at least 20kw.

You will also want to factor in how many bathrooms you have, as this will influence the boiler type and therefore the available outputs.

The table below is a brief guide to the outputs you should expect in each scenario.

Number of bedrooms Number of radiators Bathrooms Output rating Boiler type
1-2 10 1 24 – 27 kW Combi
3 15 2-3 28 – 34 kW System
4 20 3 35 – 42 kW System or conventional

Getting the right sized boiler that's right for your heating and hot water needs is vital and we can't understate this. To make sure you're on the right track, spend a bit of time reading our What size boiler do I need article. You can't go wrong then.

Choosing a boiler brand

It's worth doing your research before purchasing a new boiler, as a specific manufacturer may suit your needs more than another. Here are a few things you should consider when you're comparing boiler manufacturers.

  • Customer reviews

    It's easy to find out how reliable a manufacturer's boilers are by seeing what others have got to say. Trustpilot is a decent place to start and our Boiler Comparison Tool includes customer reviews and ratings of specific boiler models.

  • Heating engineer recommendations

    Heating engineers are industry experts so if you're looking for an opinion you can trust, there's no better person to ask. Just remember that some heating engineers may have an association with specific manufacturers.

  • Warranty

    Healthy Boiler Warranty
    All boilers come with a warranty, keeping you covered in the unlikely event of an issue after the installation. You can get an idea of how reliable a manufacturer’s boiler is by taking a look at the length of the warranty. All boilers come with a warranty of at least 1 year and can be as long as 12 years. Ariston, ATAG, Baxi, Ideal, Vaillant and Worcester Bosch all offer lengthy warranties of between 10 and 12 years on some of their models.

    Warranty length is important, but you should look into what it covers too. Some will cover parts and labour while others might only cover the labour.

    To keep your warranty valid for its full length, you will need to stick to the manufacturer's terms and conditions. These will vary between manufacturers, but one constant is to have your boiler serviced annually by a Gas Safe registered engineer.

    Find the best boiler for your home with our Boiler Comparison Tool.

    What happens during a new boiler replacement?

    Before the big day of the boiler replacement, it's important to make sure you've found a trusted Gas Safe registered professional to fit it. Most of us do quote comparisons when it comes to car insurance, energy suppliers, holidays etc. so you should adopt the same thinking when finding an installer.

    Getting quotes from at least 3 different companies will make sure you get the most competitive price for installation.

    At Boiler Guide, we've perfected the art of finding multiple heating engineers in your area. Simply fill in our form with some details about what you need by clicking the link below and we’ll get you up to 3 free quotes from installers in your area.

    How long does a boiler replacement take?

    You've chosen your boiler, used our quote service to get the best installer, so what happens on the day of the boiler replacement? Again this depends on the work involved.

    A simple like-for-like replacement (old combi for a new one) is one of the more straightforward replacement jobs for a professional. It’s possible for the work to be completed in a day, but they’ll have to put in some serious hours for that to happen. As well as swapping the old boiler for a new one, the engineer will also need to perform a powerflush of the system, and this can take a day in itself. Set aside two days for a like-for-like boiler replacement.

    A complete system change, such as replacing a conventional boiler with a system boiler, is a bit trickier. Pipework will need changing, the tanks in the loft will have to be removed and a new, unvented hot water storage cylinder installed. You can expect a complete change of boiler type to take 2-3 days.

    A like-for-like boiler swap is the most straightforward and budget-friendly boiler replacement.

    Blink and BlazeA boiler replacement can also be made more complex if you're planning to move the boiler to a new location. More often than not, a boiler is installed in the kitchen or a utility room, but these aren't your only options.

    Most people opt for a boiler move to free up extra storage space and sometimes the garage, loft or even a bedroom is a more convenient place to put it. Moving the location of your boiler will require new pipework and, in the case that it's a gas boiler being moved further away from the gas meter, a bigger gas pipe too.

    Following the boiler installation

    Once your new boiler has been installed, the heating engineer should take you through how to use the heating controls. They’ll also fill out the Benchmark Checklist, which is at the back of the boiler manual.

    The installer will then register the installation with the manufacturer and the Gas Safe Register. A few days later, you’ll receive a Building Regulations Compliance certificate through the post to confirm the boiler was installed safely.

    You can help to make the engineer's job a lot easier by clearing the space around the boiler ahead of their arrival. This will help to save them time on the day of installation so that your boiler can be replaced as quickly as possible.

    Getting the best deal on a new boiler

    If your boiler has suddenly given up the ghost, the unexpected cost of replacing the boiler can be a kick in the teeth, not to mention the financial burden it poses. If you can avoid it, opting for the cheapest boiler on the market could leave you worse off and there are boiler finance options you may wish to consider.

    Boiler finance

    Boiler finance will allow you to spread the cost of a boiler replacement over a period of time. While some boiler finance deals are interest-free, the interest rates can soar in some cases, so it's important to read the terms and conditions carefully.

    Boiler finance deals are offered by some boiler manufacturers, energy suppliers and heating engineers. As part of the application process, your credit rating will be checked to ensure you'll be able to keep up the payments. Once approved, the lender will cover the new boiler costs and you will pay them back in line with your pre-agreed arrangement.

    Boiler finance deals allow you to spread the cost of your new boiler out over a period of time.

    Compare quotes

    Before thinking about payment plans, you need to know how much you should be expecting to pay. To do this, you will need to get a boiler installation quote from a Gas Safe registered engineer. Remember, getting just one quote won't ensure that you're getting the most competitive boiler price. That's why we recommend getting quotes from at least 3 different heating companies. Some of our customers have saved over 50% when comparing.

    At Boiler Guide, our aim is to get you the most competitive price on your new boiler installation. To do that, we'll match you with up to 3 local heating engineers. All you have to do to get your free quotes is take a few moments to complete our simple online form. We’ll use the information you provide to match you with local heating engineers who are fully qualified to carry out your boiler replacement. Get started by clicking the link below.


    Data Source: Energy Saving Trust, Heating Your Home: Boilers (2022)
    *Based on replacing an old gas boiler with a condensing A-rated boiler with thermostatic radiator valves, programmer and room thermostat in a detached home. Figures are based on fuel prices as of April 2022.

Adam Cherry

About the author

Adam Cherry

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.

approved by engineer This article has been checked and approved by a Gas Safe registered engineer.

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