How much does a boiler installation cost in 2021?

Kennith Bogan

Installing a new boiler can help you save money on your fuel bills, keep your house warm, and help the environment – so find out here just how much will it cost to install a new one.

boiler installation costHow much will it cost to install a new gas boiler in 2021? As there is a lot of confusion about the supply and installation of fitted boiler prices in the UK, we have decided to create a guide and try to answer common questions such as how much it will cost to install a combi boiler, a regular boiler, and replacing a back boiler. Furthermore, we detailed the average boiler prices and the installation costs to avoid any confusion.

The gas boiler’s installation varies in cost depending on its type and make. Combi boilers start from £1,658, heat only boilers from £1,812, and system boilers from £2,090, depending on the brand that will decide to go for. 

Top reasons for installing a new boiler

    • You’re going home – your new property may not have a boiler suitable for your needs; it could likewise be outdated and wasteful.
    • You’re renovating – enhancing your property’s relaxation, and energy efficiency must be your priority when making any home improvements.
    • Ensuring you have a new, efficient boiler to maintain your home warm and provided with hot water is top of the list and may boost the value of your property.
    • Your current boiler is over a decade old – boiler technology has advanced significantly over recent years, so it’s likely that if you bought yours over ten years ago, it’s not as efficient as it could be.

What should you look for in a brand new boiler?

    • Planning Permission: Make sure that you don’t need planning permission to install your new boiler – who may need this should you reside in a listed building or need to use a brand new flue outside of your property.
    • Building regulations: To satisfy building regulations, make sure your new boiler is A-rated or at least 88% efficient as judged by the Seasonal Efficiency of Domestic Boilers in the UK (SEDBUK) scale.
    • Condensing boiler: It’s a legal requirement that all new boilers are condensing models.
      • The difference between a condensing and non-condensing boiler is that condensing boilers convert more wasted heat into energy, saving you money and helping the ecosystem.
      • If a boiler engineer deems your home unsuitable for a condensing boiler (this is quite rare), you will get a certificate to prove you can install a non-condensing one.
    • Heating Controls: Make sure you install proper heating controls and your new boiler as per component L of building regulations. This means installing, at the very least, an excellent thermostat.
    • Large homes: System boilers have a cylinder to store hot water and are great for large homes.
      • Combi boilers also make a good solution for large houses and come in gas, electric, and oil-fired versions. They do not store water, but they produce it on demand.

How we estimated the boiler installation costs

To be able to provide some estimated installation costs, we used several scenarios for all the boiler types we provided estimates for, such as:

The boiler prices used are representative of a mid-range boiler and include a standard installation. In several cases, there might occur additional costs, for example:

    • There is a need for some building work to be done
    • The gas piping is undersized, and a new one needs to be installed
    • There is the need for a condensate pipe for the first time
    • A sealed system is required to provide central heating and hot water via a storage cylinder.

Installation by a Local Boiler Engineer or Replacement Company

When the time comes for a new boiler replacement or simply a boiler repair, your local heating engineers should advise you what is best to do and carry out the job for you. Experienced heating engineers always need to look at your existing boiler and discuss the available options with you before providing a quote.

If you decide to go with a local engineer, you should know that they usually purchase the boiler system directly from a supplier and install your new replacement boiler. The new boiler always comes with a warranty, so do not worry if anything happens to go wrong after the installation.

Benefit from our service and ask for free estimates from local boilers and heating engineers in the UK. Very often, you will find that local engineers offer very competitive boiler installation rates. The estimated prices will vary depending on the reputation and local contractor or boiler replacement company that you will hire. Expect to pay around £1,500 – £3,500 for the supply and installation of a no complicated boiler replacement.

Before hiring a boiler installer or a boiler replacement company, make sure you at least get three free no-obligation quotes from other heating professionals to compare both advice and prices; do not just go with the first quotation your will receive.

New boiler installation cost by energy supplier

When having a new boiler fitted, most people prefer to contact their existing service provider to get the job done quickly and efficiently. We contacted the following gas and energy providers, who came up with the following figures:

British Gas –  charges between £2,900 and £4,000 for a new boiler installation (higher-end prices include thermostatic radiator valves and one-year free servicing)

EDF Energy –  will install a new boiler for £1,500 to £3,500 (including annual protection and fixed energy prices)

E.ON – charge £2,500 to £4,000 for a new boiler installation (with a potential 25% off bills for the first six months)

Npower – carry out a new boiler installation for £2,800 to 3,600 (higher prices including five-year free servicing and repair warranty)

New boiler installation cost by work involved

The cost of installing a new boiler might also depend on how much work the contractors have to get on with. The extent of the work involved will depend on the type of boiler you purchase and the older model you are replacing.

Replacing an existing gas combi boiler in the same position with a similar model costs £540 to £660.

Replacing a non-condensing boiler in the same position with a condensing model costs around £640 to £770.

Installing a new boiler in a different location will cost from £1,500 to £1,800

Replacing a combi boiler with an older, sealed heating system costs around  £2,000 to £2,200

How much to install a new gas boiler?

Valliant Worcester Glowworm Ideal Vokera Patterton Baxi
Combi Boiler £1,658 £1,555 £1,678 £1,686 £1,496 £1,426 £1,760
System Boiler £2,090 £1,947 £1,651 £2,034 £1,528 £1,604 £1,818
Heat only £1,812 £1,826 £1,819 £1,705 £2,025 £1,701 £1,804

Combi Boilers Prices & Installation Costs

Modern combi boilers are generally viewed as the most efficient and cost-effective boiler types for the average household. By heating only the water that’s needed as it is needed, waste is reduced to an absolute minimum, and less energy is required to provide the home’s hot water.

Regarding costs, who can pick up the actual boiler itself from about £550 and up. Higher-end models stretch well over the £1,500, as do the larger and more powerful combi boilers for larger homes and commercial/industrial use.

On top of the boiler’s purchase price, you’ll also need to factor in the parts and labor for getting it fitted and working in the first place. It’s normal to pay in the region of £650 – £1450 or so for a full professional installation package by a licensed and registered heating engineer.

Gas is the cheapest, most efficient kind of heating fuel you’re able to use. Costing around £490 a year, according to Which? These factors make gas boilers probably the most popular type – with 69% of households installing them in the UK.

Standard Gas Boiler Installation

Even a standard gas boiler can represent an efficient option for heating the house and providing hot water. The average cost of heating a home using gas is around the £500 mark, considerably lower than alternative fuels like oil, wood, and electricity.

Buying a new gas boiler means handing it over somewhere in the region of £700 to £2,000, depending on how powerful the boiler should be. As with combi boilers, the total installation and labor costs will range from £650 – £1,450, depending on your requirements.

The typical cost of owning a gas boiler (in a well-insulated, 3-bedroom, semi-detached house) is around  £720 per year, reports Which?

Oil boiler installation cost

An oil boiler system works similarly to a gas system, but it uses an oil-fired boiler to heat water, which provides central heating via radiators and hot water through taps. Oil boilers can cost anywhere between £1,180 and £2,700, depending on the type and size.

If you consider buying an oil boiler, you will have to consider the installation costs involved and the running costs. Which? Estimated that the average cost of oil heating for a three-bedroom house is £1,355, compared to £770 and £950 for mains gas, depending on the boiler’s efficiency.

Electric boiler installation cost

According to James Durr of UK-wide auction house Property Solvers: “as we gradually move into a world with less reliance on fossil fuels, it wouldn’t be completely unexpected for electric boilers to be compulsory in all homes. As such, the costs may well decrease with the increased scale of the rollout.”

Electric boilers remain a popular option for small to medium-sized homes despite costing a little more to run. They produce hot water for both heating and domestic use.

Whilst most people would only opt for an electric boiler if they lived in a rural area in which oil or gas access was not available, many people now recognize the environmental benefits, as well as the lower running costs.

Electric boilers tend to be much easier to set up and are cheaper to buy in their first place. Electric boilers supply and installation starts from £1,100 and can go over £4,000. Furthermore, heating a home with electricity isn’t cheap – national averages for the UK come out in the region of £1,500 per year.

Best Combi Boiler in 2019

who collected the following data from research conducted from New boiler. All 3,100 participants were asked three questions about their boiler experience the first 5 years after installing a new boiler. The questions focused on the i) several breakdowns, ii) value for money, and iii) ease of use.


Baxi Boiler Costs

Founded in 1866, Baxi is one of the largest boiler manufacturers in Europe and one of the most reputable brands in the UK boiler market. Based in East Midlands, the Baxi boiler brand has a strong commitment to innovation and excellence, produces a wide range of heat only, system, and combi boilers suitable for any budget.

Baxi boilers are quality products that exceed the latest European energy efficiency, safety, and emissions. Baxi boilers are super-efficient and have received a SEDBUK A-rating. They are compact and user-friendly. By choosing a Baxi to heat your home, you can rest assured that you are purchasing a quality product at an affordable price.

Types of Baxi Boilers

All Baxi boilers (heat-only boilers, system boilers, and combi boilers) use natural gas and LPG (liquefied petroleum gas). Combi boilers are becoming particularly popular given how compact, energy-efficient, and easy to use they are.

The Baxi range of combi boilers includes the Baxi 100, 200, 400, 600 and the Platinum, Duo-tec, EcoBlue Advance, and EcoBlue+. The system boiler range includes the EcoBlue System and Megaflo System, while the heat-only range models EcoBlue Heat and Advance Heat, Baxi 200 Heat, and Baxi 400 Heat also make a perfect choice.

How to choose the right boiler size?

Many homeowners wonder which size of boiler best fits their needs. Here are a few recommendations:

How Much is a Baxi Boiler?

Baxi boiler’s prices range between £665 and £1,300 and depend on the size and type of the boiler. However, the price does not include the installation cost, ranging from £250-£300 depending on how much work is required and whether the gas boiler needs to be installed in a new location. So, the average Baxi boiler installation cost comes to £1,550 + in a different location, and around £1,450 of it is sited in the same place as the old boiler.

Below are a few examples of Baxi boiler prices:

Worcester Boiler Costs

Worcester is one of the most popular and well-known boiler manufacturers on the market. The brand has a reputation for creating high-quality gas, LPG, and oil boilers.  Worcester is now part of the Bosch Group and remains one of the top boiler manufacturers, committed to delivering reputable and cost-effective central heating products.

Worcester gas boilers offer many benefits if you want to replace your old boiler or simply install a brand new one. There are many different models to choose from available at any budget. However, if you would like to get a more detailed proposal, we recommend comparing Worcester boiler prices by requesting free no-obligation from HomeAdciceGuide’s Gas Safe Registered heating engineers, who will be more than happy to provide you with free estimates on Worcester boiler replacement.

Types of Worcester boilers

Worcester boilers can fit any kind of heating needs and budget with their powerful regular, system, or combi boilers ranging from 12kW to 42 kW output. Popular regular Worcester boiler models are the Greenstar 15Ri (15kW output), Greenstar FS 42CDi (42kW), and Greenstar 40CDi Classic Regular (40kW).

If you are interesting more in system boilers, popular models are the Greenstar 24i System (24kW), the Greenstar 15i System (15kW), and the Greenstar 30CDi Classic System (30kW).

From the Worcester combination models range, you can choose the Greenstar 24i Combi (24kW), Greenstar 28CDi Compact (28kW), Greenstar Highflow 550CDi (30kW), and the Greenstar 42CDi Classic (42kW).

Which Worcester boiler do I need?

    • Apartment/house with 10 radiators + 1 bath = 24-27kW combi boiler
    • 3  bed house =  up to 28kW combi boiler
    • 3 bedroom + 1 bath = 2-15kW regular or system boiler
    • 4 bed house  + 1 bathroom + 1 ensuite shower room = 30kW

How Much is A New Worcester Boiler?

Worcester gas boiler prices start from as little as £687 and go over £2,000, depending on their performance and features. The prices include VAT but not the installation costs, for which you need to add £500 – £1,000 depending on the boiler type and labor work required. Below we have created a table with several representative Worcester boiler prices:

Worcester Boiler Benefits and Savings

Worcester gas boilers are 90% efficient, which means that at least 90% of the fuel they burn is turned into heat. If you have an old G-rated noncondensing boiler, it will achieve 60% efficiency in the best of all scenarios. Since each home spends on average 60% of its energy bills on boilers, getting a boiler replacement could save a significant amount of money.

By installing a new Worcester gas boiler, you get to:

    • Reduce energy bills
    • Convert at least 90% of fuel into heat
    • Have peace of mind for 2 – 5 years (boiler guarantee)
    • Have 10 years free service or replacement for the primary heat exchanger

Hiring a boiler engineer

hiring a boiler engineerYou must hire an experienced boiler engineer to install your new

boiler; whichever kind you select:

    • Hire a Gas Safe engineer for gas boiler installation
    • A professional electrician will be able to put in your electrical boiler to British Standards 7671: 2008 Conditions for Electrical Installation
    • An OFTEC registered engineer can safely install, repair or service your oil boiler
    • Hire a HETAS registered engineer to set up a solid fuel-burning boiler

Boiler Repair Companies

Luckily, several boiler repair companies are available to commercial and domestic clients around the clock who are ready for emergency boiler repair in London. Who you call when you need immediate service with suitable pricing is in your hands. There is a shortlist of criteria to think about before you hire. When you don’t have much time to research your options, here are some quick items to ask about.

Things to watch out for:

Any boiler repair and service company you hire should be licensed in their trade and carry insurance that protects providers and clients.


The experience of the emergency boiler repair firm is communicated by how long they have been in business, and your confidence can be established by the warranty they provide on both products and artistry. With any boiler emergency, repair timelines are critical, so you also want to consider who can respond first and complete the job with minimal disruption to you.

References and Fees
Often, you may not have the opportunity to check references, but you should still ask the provider about what they have done in the area of repair. Boiler services and maintenance they offer may also be relevant to you. Upon their arrival to your premises, ensure a clear understanding of the work to be done, the fees agreed to, the timeline for completion, and the warranty that is being assured, and get it in writing.

Emergency boiler repair is not a situation that any homeowner relishes, but the confidence gained in securing the right provider removes one less aggravation from the process. With any luck, you may still get tucked back into bed in plenty of time to enjoy a good night’s sleep.

Boiler installation grants

Nearly all the main energy companies (including – but not limited to – Atlantic, British Gas, EDF, Eon, Scottish Hydro, Scottish Power, SSE, Southern Electric, and Utility Warehouse) are required to contribute to these boiler grants UK and boiler grants Scotland initiatives, as outlined by the government’s Green Deal Financial Scheme – but how do you know if you are eligible for a boiler replacement grant? Well, that depends. Firstly, your boiler must be:

  1. More than 10 years old, and…
  2. In a reasonable state of disrepair (as certified via a free inspection from your local authority or energy provider).

Check Your Eligibility

To be eligible for a boiler grant (either a full or partial amount), you must also fulfill at least one of the following criteria:

    • Receive Pension Credit.
    • Receive Child Tax Credit or Working Tax Credit (your eligibility here is usually wage dependent; in the 12/13 tax year, only those earning less than £15,860 would be able to claim for a new boiler grant).
    • Receive some kind of Income Support, Employment Support Allowance, or income-based Jobseeker’s Allowance (and in this instance also have either a child under 16 or a child under 20 in full-time, non-university education, and/or a severe disability or disabled worker elements such as Disability Child Premium or Disability Pensioner Premium).

There’s no doubt, however, that a new boiler can be pretty expensive. Depending on what size, type, brand, and fuel they use, boilers can cost between £600 and £2,000 to buy, not including professional installation. However, you may be able to lower the cost of your new boiler by applying for one of the following grants for new boilers.

Boiler Grants UK

Check your eligibility for the following boiler replacement grant schemes:

The Green Deal – most boiler grants have been replaced by the government’s Green Deal, which provides cash up-front for households to install energy-efficient home improvements such as installing a new boiler. The money isn’t, unfortunately, a grant as such – you have to pay the cashback over time through your energy bills or a repayment meter. Contact the EST to apply for the Green Deal; to be eligible, you’ll need to have a Green Deal Assessment carried out by an approved Green Deal Provider who will arrange for the work to be carried out and paid for.

Boiler Grants Scotland – The Scottish Green Homes Cashback Scheme has replaced the Scottish Boiler Scrappage scheme and offers Scottish residents up to £400 towards the cost of a new boiler if one is recommended in a Green Deal Assessment. To apply for one of these grants, you’ll need to have a Green Deal Assessment carried out, and if a new boiler is approved, who will send your voucher to you via email or post. Once you get the voucher, have your new boiler installed within 12 weeks of the date on the voucher and pay the installer. Send the completed voucher and invoice for the new boiler to the Scottish Energy Saving Trust, which will transfer the money into your bank account within 25 days. You must use a Green Deal certified installer and get a new Energy Performance Certificate once the boiler has been installed; check with the Energy Saving Trust to determine the full eligibility criteria.

Energy Supplier Grants – energy companies are required under Carbon Emission Reduction Targets (CERT) to help their customers make their homes more energy-efficient. This includes offering grants and discounts for new boilers. Check with all different energy companies to find out whether you’re eligible for a grant – you can apply for grants from any supplier, not just the one you use.

Local Government grants – government grants for boilers may still be available from your local government or Home Improvement Agency (HIA); depending on your circumstances, ask for more details.

Warm Front Grants – sadly, the Warm Front Scheme, which provided grants of up to £3,500 towards the cost of new boilers for residents in England, is now closed.

How to choose a new boiler

Buy a similar-sized combi boiler unit.

While it may seem like a no-brainer, you must purchase a similar-sized combi boiler when you need to replace a broken one. Going with a fancier or more elaborate combi boiler may be tempting, but that may cause issues for you, as it may not fit in the current space. Be sure to measure all replacement boiler options and go with one that is either the same size or just slightly smaller or larger. The instruction manual for your old unit may have its measurements, which will help you measure new units.

Choose the right model.

boilerreplacement8Even though you probably did all the research the first time you bought your combi boiler, it may be a good idea to brush up on what models are out there to ensure you are getting the best unit for your home. Options from Vaillant, Baxi, and Glow-Worm are examples of different models on the market today. Make sure to choose a unit that will not only adequately meet your heating needs but that fits in your designated space. You may want to consult an expert for advice to ensure you get what you need and want.

Test all controls and switches

It may seem obvious, but you must test all the controls, levers, and thermostats on your own to make sure you can operate them. If you cannot work them on your own, your combi boiler will not work properly. It is OK to ask the installer or a professional in the industry how things work or show you how to operate the unit this way, and you will know how to run the unit.

Check the warranty/guarantee.

Lastly, be sure to get a full warranty or guarantee with your new unit. It is oftentimes too late to do so once you have purchased the unit, so make sure to check before you buy. This is sometimes listed in the total buying price, but some retailers may not do this, so it is important to ask. A warranty or guarantee will undoubtedly save you money on repairs in the future but note how long who will cover the unit.

Boiler breakdowns are no fun, regardless of how you look at them. With fall here and winter on the horizon, you definitely don’t want to be dealing with a loss of heat. Unfortunately, you cannot plan for a boiler breakdown. However, if you currently heat your home with a combi boiler, you will be pleased to know that getting a replacement is far easier than you may think.

Because combi boilers do not have radiators, copper-piping, or old hot water storage tanks, choosing a replacement is as simple as picking out a new, similar model and getting it installed. While it may be less of a headache than with old models, this does not mean it is a complete walk in the park. There are still numerous things to consider when choosing a replacement boiler, some of which are outlined below.

Quick tips:

Once you’ve got the finance sorted for your new boiler, you need to choose the right one for your property; make sure that:

    • It’s A-rated or at least 88% efficient on the SEDBUK scale.
    • You choose a condensing model – this is a legal requirement in the UK, and all new boilers are condensing.
    • Your new boiler comes with proper heating controls for extra energy efficiency.
    • You hire a professional to fix your boiler. Look for a Gas Safe Registered engineer if you’re fitting a gas boiler, someone registered with OFTEC if you’re installing an oil-fired boiler, or a qualified electrician if you need to install an electric boiler.

Benefits of a new boiler installation

There are several benefits to looking into grants for new boilers and having your existing boiler repaired, replaced, or updated. A new combi-boiler, for example, will:

    • Function more reliably than a hot water system and keep water heated for longer – saving you time on waiting around to get in the shower each morning.
    • Be easier to use than a hot water system, thanks to an in-built control panel and easy-to-read instruction manual that comes with every purchase.
    • Deliver clean water to every faucet and outlet in the property, allowing you to get drinking water from any tap in the house.
    • Last for longer and require less maintenance than an old, creaky system suffering from poor circulation and struggling to work at its peak with old pipework and dated radiator units.
    • Improve your home’s energy efficiency by heating only as much of the property as you’d prefer, thanks to a high-tech thermostat and improved radiator units that don’t waste heat.
    • Reduce your gas and electricity bills over time, as less wasted heat means you won’t be turning up the thermostat as regularly as usual!

Remember, with the current Coalition government’s changes to Income Support and the introduction of Universal Credit, this eligibility criteria is likely to change in the next year or so – so if you remain unsure about whether or not you have access to a brand new boiler grant you should get in touch with your local authority for the most accurate, up-to-date information possible.

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