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Last updated: 6th December, 2023


New Boiler Cost & Installation Price, what to expect in 2023?

New Boiler Cost & Installation Price, what to expect in 2023?

Key takeaways

  • A combi-to-combi boiler installation in 2023 can cost you around £1,795. The location you live in can be a big factor for new boiler costs.
  • You should consider replacing a boiler if more than 15 years old. Upgrading your boiler in the summer months will be less disruptive.
  • Back boiler replacements can cost between £2,300 and £6,000, allowing up to 2 days for a back boiler conversion to be fully completed.

The cost of a new boiler in 2023 depends on the installation type and many different variable costs. On average the cost of a new boiler installed can range between £1,500 and £4,500.

There is a lot of conflicting information about how much a new boiler costs and what the best boiler is, making the whole process of finding a new boiler for your home even more difficult.

Let's go into more detail on what costs you can expect from a new boiler installation... Enjoy our guide on what a new boiler costs in 2023.

How much does a new boiler cost?

The prices of new boilers vary depending on the model and type of system and installation type.

For example, a budget combi boiler would range from £600 to £900, while a medium-tier one would likely set you back between £900 and £1,200.

A top-tier premium, larger combi boiler, on the other hand, could cost anywhere between £500 and £3,000 before labour costs.

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New boiler costs

The average cost of a new boiler installed can range between £1,500 and £4,500.

New Boiler Type

Cost (excl. Installation)

Cost (inc. Installation)

Combi swap

£500 - £3,000

£1,500 - £4,500

System boiler

£550 - £3,500

£1,700 - £4,000

Conventional boiler

£600 - £3,500

£1,700 - £4,000

Electric boiler

£550 - £2,500

£1,600 - £3,500

Other system install costs

System type

Price (inc. Installation)


Combi conversion

£1,500 - £4,500

Get a quote

New full system install

£3,000 - £6,000

Get a quote

Back boiler conversion

£3,000 - £5,000

Get a quote

Get your fixed price quote in as little as 30 seconds using our clickable form.

Most companies will offer several different kinds of combi boilers that can be installed in your home. In most cases, these companies will recommend the best boiler for your home, and you will have to pay the amount that comes with it.

Some other factors can affect the price of a new boiler installation, including the warranty length, labour costs, and how complicated the installation process is.

This will all differ based on the type of boiler that is best for your home and the company you go through.

Factors that influence the cost of a new boiler

You will be given a specific quote from the boiler installation company based on:

  • The type of home you have (i.e. terraced, semi-detached, etc.)

  • How many bedrooms you have

  • How many bathrooms you have

  • Your postcode and specific location

Based on this information, you will be given a quote typically between £1,500 and £2,500 for a new boiler.

Location can be a big cost factor if not careful

For example; If you live in London, then you should expect to pay a much higher rate for a new boiler than someone who lives further up north, but isn't this always the case?

It is recommended that you try to get an instant boiler cost and quote online or directly from the boiler company so you can get a good idea of how much you will need to budget and put away for a new boiler.

What are you paying for with a new combi boiler?

No matter how long the new boiler is installed into your home, you will face standard labour costs.

These costs can differ based on the gas company you use and whether you have an insurance plan with them, but either way, the engineers doing the job will need to get paid.

Usually, labour costs will be based on an average and an estimation of the time it will take to complete the job.

As well as labour costs, you may face charges for any additional parts that need to be installed and the cost of the new boiler.

For example, if the pipework needs to be replaced before the new combi boiler can be installed, then you will not only face additional labour charges for this but also potentially the cost of materials too.

New boiler installation from Gas Safe engineer

New boiler cost explained in more detail

In most cases, you will be looking into getting a new boiler as a replacement for the one that you currently have in your home, such as an immersion heater.

You must have a reliable and working boiler in your home all year round to keep your family safe and warm. With this in mind, you may be looking to replace your old boiler with a new combi one as these are more reliable.

Full System Conversion Boiler Prices

If you are trying to replace your old gas system boiler with a new combi boiler model or something completely different like an immersion heater, then you can expect high boiler costs because of the work involved in this process.

For example, if the engineer needs to change the pipework or the location of your new boiler system before it can be installed, then this can be a costly and timely process.

Other costs to consider when it comes to replacing a boiler, along with the cost of labour from the engineer, are a system cleanse.

This is something the engineer will perform before installing the new pipework and the new boiler in your home.

Depending on where you get your new boiler from and the type you choose, you may be encouraged to buy a new filter system to help it run better. On average, this can add £100 to £200 to the total price of new combi boiler costs.

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When Should I Replace My Boiler?

There are a few different factors that you should take into account when deciding whether or not to replace your boiler. The first is the age of your boiler.

If your boiler is over 15 years old, it's probably time for an upgrade.

Not only are newer boilers more energy-efficient, which can save you money on your energy bills, but they're also less likely to break down.

Another factor to consider is how often you've had to repair your boiler in recent years. If you find yourself calling a heating engineer for repairs more and more frequently, it's probably time to start thinking about replacing your boiler before it completely breaks down.

Additionally, if the cost of repairs starts to outweigh the cost of a new boiler, replacement is the way to go. Finally, consider how well your current boiler meets your needs.

If you've recently had a baby or added another bedroom to your house, for example, you may need a bigger boiler than you currently have.

Alternatively, if you've installed insulation or draught-proofing measures, you might get away with a smaller boiler than you originally thought. No matter what, our team of experts can help you choose the right boiler for your needs

There's no hard-and-fast rule for the best time to replace your boiler. However, there are a few different factors that you should take into account when making your decision, including the age of your boiler, the frequency of repairs, and how well your current boiler meets your needs.

When is the best time to replace my boiler?

If you boiler is broken or on its last legs then you should seek to get it to replace as soon as possible, otherwise..

Your boiler replacement should probably take place in the summer.

You might ask why in the summer?

  • Boiler engineers are less busy in the summer

  • Less reliant on the boiler during the summer months

  • You can stay warm whilst your new boiler is being installed

  • Even if your boiler is not broken you should still look to replace your boiler every 10-15 years.

Otherwise… it can result in further issues in your home and leave you without access to central heating or hot water until the engineer can come out.

Leaving a broken boiler unattended is unsafe, making your house uncomfortable – especially during the winter.

This is why the best time to have a new boiler installed or get a system check-up is during the summer, as this is when the demand for central heating, at least, is less high.

Depending on your issues with your boiler, location, and other variables, it could take some time before an engineer can come to your property.

What if My Boiler Breaks Down Suddenly?

Most gas companies will offer emergency appointments and callouts should your boiler need immediate repair, but you still have to wait hours at least before anything can be done.

This time may be extended if your boiler needs certain parts to repair it or your full system needs to be replaced.

Emergency appointments are also expensive, so regular boiler maintenance is recommended to prevent issues early on.

two new combi boiler brands

What am I paying for with a new combi boiler?

Many steps are involved When replacing an old boiler with a new combi one, which is why it can be expensive.

To keep things simple, replacing a boiler includes:

  • Full removal of your old boiler system and water cylinder

  • Upgraded and new pipework fed into the existing location or a new one if required

  • The price of your new boiler itself

Some other fees can come with this service, but that doesn't mean it isn't worth it.

Replacing a combi boiler is a big job that can take a couple of days and two or more engineers in your home; simple combi swaps can be done in as little as half a day.

Types of new boilers available

There are many different brands and models available to choose from when considering installing a new boiler; it can be overwhelming for a novice to wade through, and the type will also influence the boiler cost.

The boiler engineer should be able to guide you to the best model for your home, so make sure you take their advice. They will consider the kind of house you have but may not necessarily consider your budget so make this clear.

When looking into new boilers, there are lots of different complicated names out there.

iHeat have lots of models on offer, but here are some of their main brands that you will probably have to choose from:

Additional Costs to Consider

Buying a new boiler is just the beginning. Many homeowners often overlook the additional costs that come with installation, labor, and potential upgrades, which can significantly impact the overall expenditure. So, what are these costs?

  • Installation Costs: Typically ranging from £500 to £1,000, these are the fees you'll pay to have your new boiler properly installed.

  • Labor Costs: Depending on the complexity of the job, labor can cost an additional £200 to £500.

  • Upgrades: If your home requires a new gas line or electrical upgrades, expect to pay an extra £100 to £300.

Have you set aside a budget for these additional costs?

Practical Tips for Saving Money

While the upfront cost of a new boiler can be daunting, there are ways to save money in the long run. Consider these tips:

  • Energy Efficiency: Opt for an energy-efficient model to save on future energy bills.

  • Off-Season Installation: Rates are often lower during off-peak seasons.

Have you considered the long-term savings of an energy-efficient boiler?

How much do new regular/system boilers cost?

✅ Between £1,500 and £4,000

A new regular boiler (also known as a system boiler in the industry) can cost between £1,500 and £4,000, depending on the factors we have already mentioned.

You will not be able to get a clear quote unless you speak directly with the boiler company and give them information regarding your situation.

The final amount of installing a regular boiler into your home can be affected by various factors:

  • The brand of the boiler

  • The warranty length (iHeat offers form 5 - 10 year warranties)

  • Required controls (wireless or wired)

  • Any additional pumps or valves needed

  • The complexity of the job (such as removing of an old tank)

Regular or system boilers require a water cylinder to work, which is one of the main differences between these and combi boilers.

This means that a water cylinder will also have to be installed in your home, which will, of course, come with additional costs.

The figures we have given and those that you will likely be given from a boiler company only cover the installation of the regular boiler, not the water cylinder.

So you must ensure you have enough in the bank to cover your new boiler installation and some if you want a regular or system one.

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How much does a back boiler to combi conversion cost?

Between £3,000 and £5,000

If you are currently dealing with a broken back boiler in your home, you must get someone to sort it out. This is a problem that no modern home should be dealing with.

Back boilers have had their days in the sun, but now they are causing more problems than they are worth.

These kinds of boilers can no longer be repaired by the modern regulations boilers now need to keep up with, so there is nothing you can do about this problem other than replacing it with a new combi boiler.

In most cases, replacing a back boiler with a combi can cost between £3,000 and £5,000.

Any Additional Boiler Costs?

Most companies will also have an additional fee on top of this when it comes to replacing a back boiler.

This is because this is such a complicated process, and the pricing needs to reflect that.

The quote you receive from some boiler companies may not include this additional fee, so ensure you have more in the bank than they are asking for to keep yourself covered.

What's Involved In A Conversion?

The actual process of converting a back boiler system to a combi boiler one is quite similar to any other boiler replacement, as it also includes the entire removal of your current boiler before the new one can be installed; the cost may differ.

This includes replacing the pipework and all the other complicated bits with a boiler. You won't get any hidden costs with us.

However, the fact that a back boiler is inconveniently located behind your fireplace makes this a very complicated task and one that most companies do not enjoy doing.

This is why you can expect a much higher cost of boiler for this kind of boiler service, as there are more steps involved than replacing the system with a new boiler.

Most boiler companies will charge such high prices for this kind of service as it makes the task slightly easier to bear when you know there will be a nice paycheck.

We also have a huge in-depth article on back boiler conversions and their full cost.

Replacing a combi boiler

Those looking to replace their combi boiler with a new model can expect the engineer to work around four hours.

This is only the case for straightforward swaps with like-to-like boilers, such as replacing an older combi with a newer model.

These times do not include any additional delays that may occur when buying a new combi boiler, such as the need to replace pipework or relocate the entire boiler system.

For older homes, a new combi boiler will likely need to be installed in a new home location.

Replacing boilers in older homes

Modern combi boilers typically get installed in the kitchen, but if you have an older gas model, this could be anywhere, such as in an airing cupboard, a bedroom or even the attic.

This means that as well as the standard four to six hours required for installation, additional time will be needed for the engineer to tear everything out and start again. In some cases, this can go on over two days, depending on the severity of the job.

The average time it takes to replace an old boiler system with a combi one is two days (but can often be completed in one). These times can differ based on your location and the availability of the gas company, as areas with higher demand will have to deal with longer time delays.

How much does boiler installation cost?

✅ Between £1,500 and £4,500

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Typically, a boiler installer could charge you between £1,500 and £4,500, this is for both materials and the installation of the new boiler. If it's a gas system, the new boiler costs can vary heavily for LPG or Oil.

iHeat includes this in the price with the combi boilers.

What other costs should I be aware of?

When purchasing a new boiler, you should note the possible hidden charges or the cost of items you may not know.

  • The boiler (gas or LPG)

  • Full labour for the boiler install

  • Boiler wireless thermostat controller

  • Gas pipe upgrade if needed

  • Boiler flue kit

  • Boiler plume kit

  • Brick repair if needed

  • Up to 10 year warranty

We include all the following as standard with every job; no hidden charges exist. Our new boiler costs are always fixed, and unless you incorrectly complete the quote will never change.

Additional factors influencing the boiler replacement cost

Boiler Fuel Type

A variety of elements contribute to the overall cost of boiler replacement. One primary factor is the type of fuel used. Common fuel options include natural gas, oil, and electricity. Typically, fuel type has a significant impact on the cost of boiler installation, with prices ranging from £500 to £4,300

System Type

However, the complexity doesn't end there: the type of boiler system likewise plays a role in determining cost. There are three main types of boiler systems: combi, system, and conventional boilers. Each system has its advantages and drawbacks, potentially altering the overall price. For example

  • Combi boilers: energy-efficient and compact, saving space and resources

  • System boilers: easy to install, providing a balanced supply of hot water to multiple taps

  • Conventional boilers: suitable for larger homes, requiring a cold water storage tank and hot water cylinder

Size Of Your Home

The size of your home can also affect the cost of boiler replacement. Larger homes generally require more powerful boilers to heat the space effectively, leading to a higher overall cost. Boiler installation costs can range between £2,200 and £9,700, depending on your property's size.

Where You Live

Additionally, the location of your home may influence labour costs. Skilled technicians are responsible for installing and replacing boilers, so their fees can vary depending on your region. It's essential to compare local services to get an accurate estimate tailored to your specific situation.

Boiler Upgrades

Lastly, if boiler upgrades and modifications are needed to comply with building regulations or improve system efficiency, these can also contribute to increased costs. Such upgrades might include updates to the heating controls, installation of thermostatic radiator valves, or adjusting the gas pipework.

In summary, the replacement cost for a boiler is influenced by factors such as fuel type, boiler system type, property size, geographical location, and potential upgrades. By considering these elements, homeowners can make informed decisions when planning for their boiler replacement.

Final note: Key takeaways

Installing a new boiler into your home is a complicated process that can cost a lot of money, which is why you need to prepare for it; always make sure you pick a suitable time of the year for your installation if complications arise during summer you will be less affected if your boiler is out of action

Maintenance and Repair Considerations

Operating a boiler system entails regular maintenance and occasional repairs. Staying up-to-date with routine checks can help prevent costly breakdowns and extend the lifespan of your boiler.

One key aspect of boiler maintenance is yearly servicing. This typically costs between £50 and £125 depending on the type and complexity of the system. During a service, a professional engineer will inspect, clean, and carry out minor adjustments to ensure your boiler is running efficiently.

Boiler repair costs can vary greatly, ranging from £150 to £700. The final price depends on factors such as the boiler type, the complexity of the issue, and whether replacement parts are needed. For example, electric boiler repairs tend to be more expensive, with costs falling around £200 to £450.

Consider the age and overall condition of your boiler when faced with costly repairs. Assess whether it is more cost-effective to repair or replace the unit. A new boiler installation can range from £1,500 to £4,000 with the average cost sitting at £1,800. By replacing an older, less efficient model with a modern, energy-saving boiler, you may save money in the long run by reducing your energy bills.

To summarise, regular maintenance and prompt repairs are crucial to maximising the efficiency and longevity of your boiler. Assess repair costs and weigh them against the long-term benefits of a new boiler if necessary. Proper care and consideration will help ensure minimal disruption and optimal heating performance in your home.

It's essential to note that boilers have different energy efficiency ratings. Choosing a high-efficiency model can reduce monthly energy bills, translating to long-term savings. The initial investment may be higher, but the ongoing savings will likely outweigh the upfront cost.

Lastly, regulatory requirements can affect overall expenses. To comply with safety standards and energy efficiency codes, homeowners are often required to invest in specific equipment or upgrades like thermostatic radiator valves or a magnetic dirt filter.

In short, several factors contribute to ongoing costs after installing a new boiler. To make an informed decision, it's beneficial to understand the fuel type, maintenance, efficiency ratings, and regulatory requirements associated with a particular model.

New Boiler Cost by Boiler Manufacturer

When considering a new boiler, the cost by the manufacturer plays an important role in decision-making. Different manufacturers offer varying levels of efficiency, durability, and pricing. Let's explore some well-known boiler manufacturers and their average costs.

Boiler Brand

Boiler Cost (Excl. Installation)

Boiler Cost (Inc. Installation)

Worcester Bosch



Get a quote




Get a quote




Get a quote




Get a quote




Get a quote

Worcester Bosch

Worcester Bosch is a renowned British brand, offering high-quality boilers with excellent energy efficiency ratings. Prices for Worcester Bosch boilers (inc installation) range from £2,200 to £3,800. Their reputation for reliability and performance makes them a solid choice for homeowners.


Vaillant boilers have been available since the late 19th century, and they remain a popular choice today. Vaillant boilers generally cost around £2,400 to £4,500. Their energy-efficient models are a favourite among environmentally conscious consumers, making this German brand a solid contender.


British-based Ideal offers budget-friendly boilers without compromising on quality. The prices for Ideal boilers can range from £1,900 to £3,500. These boilers might not have all the bells and whistles that the premium brands do, but they still offer reliable, energy-efficient performance.


Lastly, Viessmann is a German manufacturer with a reputation for producing high-quality boilers with advanced technology features. Their average price range is between £2,300 and £6,000. Viessmann's commitment to innovation and efficiency makes their boilers a choice worthy of consideration.

Payment Options and Grants

Financing a new boiler can be a significant investment. But did you know there are multiple ways to ease the financial burden? Here are some options:

  • Monthly Financing: Many companies offer monthly payment plans (including iHeat), from 0% APR to 10 year finance plans.

  • Government Grants: Programs like the Energy Company Obligation (ECO) Scheme can help offset costs if you meet certain criteria.

Are you eligible for any grants or financial assistance programs?


In conclusion, while the precise cost of a new boiler depends on the manufacturer, capacity, and type, it is essential to research the brands mentioned above - Worcester Bosch, Baxi, Vaillant, Ideal, and Viessmann. Do not hesitate to request quotes from multiple suppliers and weigh up the options based on factors like energy efficiency, warranty, and reliability.

Luckily, there are a lot of options available when it comes to the types of boilers available. Every home deserves to be warm and cosy, making it crucial to find the best boiler possible.

Finding how much it will cost to have a gas combi boiler installed into your home can be a minefield as you will be given lots of different figures ranging from £1,000 to £6,000 depending on your home, the kind of boiler you choose as well as some other factors.

To find the best combi boiler for your home, you should make sure to get a fixed quote that covers both the chosen boiler new boiler and installation cost, as well as a full part and labour warranty that suits your needs.

You may also qualify for a free boiler from the regulations set out by the government; these guidelines are constantly changing as the government pushes for more use of renewable energy sources and new technologies like air source and ground source boilers.

Make sure you take some time to gather a good range of quotes and advice when putting together new boiler costs to ensure you are getting the best deal including a quote from iHeat.

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Frequently Asked Questions

How long does it take to install a new boiler?

A new combi boiler installation usually takes around 4 - 6 hours from start to finish. This includes the time it takes to remove the old boiler (if you're replacing one) and any necessary plumbing and gas work.

How long does it take to install a conventional boiler?

Conventional boiler installations can take up to 8 hours, depending on the size and complexity of the job. Again, this includes time for removing the old boiler and any associated plumbing or gas work.

How long does it take to convert a system to a combi boiler?

This can take 8 to 14 hours; we recommend giving yourself two full days to complete the installation.

Can I get a free boiler?

In 2019, the UK Government introduced an Eco Scheme that allows qualifying homeowners to replace their old, inefficient boiler systems. This can come free of charge or at a cost that has been significantly cut based on your circumstances and how you qualify. If you do qualify for this service, the government will arrange for a local engineer to come around your house and install a new (probable combi) boiler system in your home.

How much does a boiler replacement typically cost in the UK?

Boiler replacement costs in the UK vary substantially, depending on boiler type, brand, and installation complexity. Generally, conventional boiler costs can range from £600 to £2,500. However, this is just an indication; actual costs can differ based on your specific needs and location. You must obtain multiple quotes from reputable professionals to get the best deal.

What are the average costs of a new combi boiler with installation?

Combi boilers are popular for demanding hot water. These boilers typically cost between £1,500 and £2,500, including installation fees. The price can fluctuate depending on the capacity and efficiency of the boiler and the degree of installation complexity. Again, gathering quotes from multiple professionals is advisable to ensure a reasonable price.

What are Worcester Bosch boiler prices?

Worcester Bosch is a reputable UK-based boiler manufacturer with a broad selection of boilers to suit various needs. The prices for their boilers can range from around £600 for a basic, entry-level model up to nearly £3,000 for a top-of-the-range, high-efficiency system. Remember that installation costs are not included in these figures, so expect additional expenses for the fitting process.

Are labour-only costs for boiler installation significant?

Indeed, labour costs play a major role in the overall expense of boiler installation. The complexity of the installation, combined with regional differences in labour rates, can impact the final cost. Generally, labour-only costs can range between £500 and £1,000, but specific quotes should be sought for a more accurate amount.

Why do new boilers have a high price tag?

While the price tag for a new boiler is substantial, various factors contribute to the cost. Firstly, boilers are complex equipment manufactured with precision engineering and high-quality materials. Secondly, the installation process is intricate, often requiring certified professionals to ensure safety and longevity. New boilers typically come with warranties and energy efficiency ratings that provide peace of mind and long-term energy savings.