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  • New Boiler Cost

    Updated: April 6, 2024

    How much is the cost for a new boiler?

    A new boiler can cost £600 – £900 for a budget model, £900 – £1,300 for a mid-range model and £1,300 – 2,500 for a premium model.

    There are four main types of boilers or heating systems for you to look at the cost of:

    1. The Common, Heat Only Boiler
    2. A System Boiler
    3. Combi Boilers
    4. The new Heat Pump!

    We have compiled a list of the top boilers, boiler brands and boiler pricing for each of the different types:

    What is the cost for Heat-Only Boilers?

    Heat Only or common boilers cost from approx £500 to £2000 dependent on the brand and the size of the model etc.

    These common boilers, are a traditional domestic boiler type, which were often found in all homes in the UK that were  built before 1970.

    The heat-only boiler directly provide heating and hot water from a storage cylinder, usually situated in the airing cupboard.

    The boiler is fed by a cold water cistern from above (usually the attic), via gravity.

    The expansion cistern is separate so this boiler system requires a reasonable amount of space.

    These boilers vary greatly in price dependant on the brand in question, with models usually starting at £500, and reaching up to £2000 for some makes and models.

    New Boiler Cost

    Heat Only Boiler Brands & Prices…

    • WORCESTER BOSCH GREENSTAR UTILITY 50 – 70 (OIL) – Typical Price – £1,700 – £1,900
    • W-B GREENSTAR FS 42CDI REGULAR – Typical Price – £1,500-£1700
    • WORCESTER-BOSCH GREENSTAR 30CDI REGULAR – Typical Price -£1,200-£1,300
    • VAILLANT ECOTEC PLUS 428 – Typical Price – £800 – £900
    • ECOTEC PLUS 415 – Typical Price – £600-£800

    Heat-Only Boiler Costs and Sizes

    The cost of your Heat-only boiler would depend on the size of your house and the fuel type required etc.

    These boilers are ideal for larger homes as they have a high flow rate, are able to meet high hot water demands, and multiple taps or showers can be used at any one time.

    They will however require more space than other boilers such as the combi, and the use of hot water is limited by the size of your cylinder so once it’s gone, you must wait for it to reheat.

    Heat only boiler brands and Costs for different sized properties:

    Heat-only boilers for smaller properties

    If you live in a small property and space is of primary concern, there are more compact, wall mounted options for heat only boilers.


    • Output – 12;15;18;24;32KW
    • Price: £500-£600

    Brand: BAXI SOLO 12 HE

    • Output – 12;15;18;24;30;35KW
    • Price: £600-£700

    Heat only boilers for medium to large Properties

    Medium and large sized properties need a heat only boiler, with a high output; ensuring that you are able to heat your entire home.


    • Output – 38KW
    • Price: £1,200-£1400


    • Output – 30;42KW
    • Price: £1,500-£1700

    What is the cost for a Combi Boiler?

    UK Combi boiler brands and reviews:

    According to UK consumer brand Which?, “if you want to buy the best combi boiler, you will  need to make sure it’s the correct size for your home and from a reliable brand.”

    The Which? article then went on to rate the Most common brands of Combi boiler under many categories like:

    • Brand Overall score,
    • Reliability score,
    • customer score,
    • engineer overall score,
    • Typical price for a 30kW Combi boiler.

    The Typical prices for the UK combi boiler brands were listed in the article as;

    • Baxi £880 – £1,000
    • Glow Worm £700 – £990
    • Ideal £590 – £1,270
    • Potterton £650 – £1,350
    • Vaillant £1,160 – £1,410
    • Viessmann £780 – £1,280
    • Worcester Bosch £800 – £2,460

    The Which? article says that the Reliability and brand customer score was based on responses from 8,001 members of the public who’ve bought a combi boiler in the last six years, that took place in May-June 2021.

    The Brand engineer score was based on responses from 153 Which?, Trusted Trader heating engineers in June 2021. 

    The typical price range for the which assessment was based on the low and high price ranges for a standard 30kW combi boiler, across the combi boiler brand’s full range.

    A 30kW boiler is suitable for most medium-sized homes.

    The combi boiler prices do not include the boiler installation costs.

    So now you can see the combi boiler scores via the article direct and the various prices, it good to also consider what makes a good combi boiler?

    According to the article, a good combi boiler will deliver plenty of hot water for your showers, baths and sinks, and will keep your radiators piping hot throughout the coldest of winters.

    The article also covers the brands that make the most reliable combi boilers, according to the Trusted Trader Heating Engineers that were questioned.  

    New Boiler Cost

    What are the main UK brands that make combi boilers?

    As per the same Which? article which sites a 2021 boiler survey of 8,001 members of the public.

    There are 17 gas and oil boiler brands that are all producing combi boilers. 

    Please find some details and pricing for the top 7 combi boiler brands:

    # Baxi boilers:

    Baxi is one of the biggest combi boiler manufacturers in the UK.

    Details: Its range of Assure, Duo-tec, Megaflow and Platinum combi boilers come in various sizes to suit almost any size and type of home.

    Price – They typically cost between £880 – £1,000 for a 30kW medium-sized combi boiler, although it has models starting from around £550.

    # Glow-worm

    Details: Glow-Worm has several ranges of combi boilers including Energy, Essential, Betacom, Easicom and Ultimate.

    Price: Prices starting from around £560, with a medium-sized combi boiler usually being between £700 – £990.

    # Ideal boilers

    Details: Originally called the National Radiator Company, Hull-based Ideal has been around for 100 years. It has several ranges of combi boilers including Exclusive, Instinct, Esprit Eco and Logic+ ranges. 

    Prices: You can get a 30kW medium-sized Combi boiler from around £590, going up to £1,270. 

    # Potterton boilers

    Details: Potterton is part of Baxi, which is in turn part of the BDR Therma Group. As such, several of Potteron’s ranges – such as its Assure range – have been absorbed under the Baxi name. It still owns the Titanium Combi boiler brand.

    Price: Prices for the Titanium start at £800 for the 28kW size.

    # Vaillant boilers

    Details: German manufacturer Vaillant is a large combi boiler manufacturer which has the ecoFIT and ecoTEC range of combi boilers.

    Price: These Combi boilers typically start between £1,160 – £1,410 for a medium-sized boiler of 30kW.

    # Viessmann boilers

    Details: Viessmann is a German boiler brand making waves in the UK boiler scene. Its Vitodens combi boiler lines have been updated in 2021.

    Price: The Viessmann Boilers cost between £780 –  £1,280 for a mid-sized 30kW boiler, and come in a large range of sizes for the requirements of any home.

    # Worcester Bosch boilers

    Details: German manufacturer Worcester Bosch is one of the biggest combi boiler manufacturers in the UK. 

    Price: The Greenstar combi boiler range starts at around £800 and goes up to around £2,500, depending on the size and the hot water flow that you need for your home.

    Other things to consider?

    • Combi boilers are less suitable for homes with multiple bathrooms.
    • A faulty combi boiler will fail early and is likely to result in regular costly repairs.
    • On average, it costs almost £200 for a boiler repair so this can soon add up, making any cheaper boiler purchase more expensive than a more expensive but more reliable boiler, in the long run.(Which? survey, 2021).
    • It pays to invest in a boiler that will last. 
    • Size matters.  An oversized combi boiler will lead to you spending more on your heating and hot water than you need to, and an undersized one will deliver a disappointing flow of hot water to your taps and radiators.

    Please read our guide on the  different types of boiler to see which type will best suit your property and your requirements.

    So, What makes a good combi boiler?

    1. In order to get the best combi boiler, it is crucial to choose a reliable brand that won’t break down.
    2. It’s also important to pick a combi boiler that’s the right size and fit for your home. 
    3. And you need to select the right boiler for your budget*

    *we can assist you with finance should this be required for your new boiler purchase and installation.

    How to pick the right size combi boiler for you property?

    • The simplest way to estimate the size of boiler you might need is to count the number of radiators you have.
    • If you have Fewer than 10 radiators you require a boiler under 27kW
    • For 10-15 radiators you need a boiler between 28kW and 34kW
    • Where you have more than 15 radiators you need a boiler with over 34kW

    What is the cost of System Boilers?

    System boilers are common in the UK.

    The system boiler is especially popular for households with more than four people or properties with more than one bathroom.

    Please find some information, advice and pricing on the best system boilers for you to choose from.

    If you are unsure whether you need a system boiler, a combi boiler, or a heat only boiler, please take a look at our quick online guide.

    Best System Boilers for this year, 2024 and beyond!

    Please also take a look at our best combi boilers and best heat only boiler pages!

    According to a recent Which? Article, the best 3 UK system boilers for 2021 and beyond are:

    • Viessmann Vitodens 100-W System
    • Worcester Bosch Greenstar i System
    • Vaillant ecoTEC Plus System

    # Viessmann

    Model: Viessmann Vitodens 100-W Gas System Boiler

    Details: The Viessmann Vitodens 100-W System boiler is a reliable and fantastic wall mounted gas condensing boiler. 

    These gas system boilers are available for prices around £1000, making it a great choice for any home who wants a top-quality but affordable system boiler.

    The Viessman Vitodens 100-W comes in 26kW, 30kW, and 35kW system boiler sizes.

    This system boiler is perfect for larger homes with more than four people, or more than one bathroom, where the demand for hot water is high and to multiple taps at once.

    This system boiler rates ‘A’ Class in the SEDBUK energy efficiency ratings.

    Veissman Boiler Main Features:

    • High modulation ratio of 1:6
    • SEDBUK A Rating
    • MatriX pre-mix cylinder burner and an integral AquaBloc hydraulic unit
    • Various Kw Heating Output -26kW, 30kW, and 35kW
    • Very Quiet Boiler
    • Optional external weather detector
    • Advanced technology
    • Which Rating 76%
    • LCD touchscreen
    • Compact size
    • Lightweight
    • 5- year parts and labour warranty as standard (Up to 10 years with Viessmann Installer)

    1st place

    1st place due to quality, performance, lengthy warranty and value for money. 

    Price: This boiler is usually priced around £1,000 and with installation, you can expect a cost between £1800-£2200 depending on the installation cost of the company who’s installing it. 

    Want a quote?

    With us here at Let’s Heat you can get an online quote now to see how much we can install it for: Get Quote Now!

    And please remember that whoever you use to install your boiler, please ensure that they are gas safe registered, as we are and that they have a great review score for their workmanship see our 4.9 Trustpilot rating here!

    # Worcester-Bosch

    Model: Worcester-Bosch Greenstar 24i System Boiler Reviews

    Details: The Worcester-Bosch Greenstar 24i System Boiler is one of a range of highly energy-efficient A-rated gas boilers from Worcester-Bosch.

    These Boilers are highly rated by SEDBUK 2009.

    The Worcester-Bosch Greenstar 24i System requires a hot water storage cylinder; however, it doesn’t require a feed and expansion cistern.

    This makes the Greenstar 24i a quick and easy Boiler to install which can being down the installation cost, and this also makes it efficient and economical to run.

    Worcester-Bosch Boiler Main Features:

    • ERP rating: A HEAT
    • Efficiency Rating: 94%
    • Band Rating: A Rated
    • LPG Compatible: Yes
    • Standard Warranty: 5 Years
    • kW Options: 24.6 kW
    • Mounting: Wall-mounted

    2nd Place

    2nd place due to value for money and efficiency.

    Price: The price comes in around £1,000 on average for these Boilers, with an installation price, being around £1,800 to £2,200. 

    Want a quote?

    With us here at Let’s Heat you can get an online quote now to see how much we can install it for.

    And please remember that whoever you use to install your boiler, please ensure that they are gas safe registered, as we are and that they have a great review score for their workmanship see our 4.9 Trustpilot rating here!

    #: Vaillant

    Model: Vaillant ecoTEC Plus System Boiler

    Details: The Vaillant ecoTec boiler range is a fantastic and low energy consumption system boiler.

    The Vaillant ecoTEC has excellent performance for hot water and central heating which results in lower energy costs for you. 

    The Vaillant ecoTec 30kW is the most popular size boiler in this range, but it is also has; 12kW, 15kW, 18kW, 24kW, 30kW and 37kW models available.

    The ecoTEC plus is smart: when it knows you don’t need as much heating power, it can drop to using 16% of its maximum power saving on fuel and money and is known to be efficient, easy to use, reliable and quiet.

    With its straightforward backlit display and like the Viessmann, its stainless-steel heat exchanger and it’s premium components, it’s really one of the top system boilers available on the market today.

    Vaillant System Boilers Features:

    • For use with Unvented Systems.
    • Stainless steel heat exchanger
    • Advanced modulation during low usage to ensure maximum efficiency
    • New high-efficiency pump to reduce energy consumption
    • Stylish contemporary case design to ensure a seamless fit with home decor
    • ErP Compliant
    • Lightweight and compact
    • Natural Gas fueled
    • Includes 2 stage frost thermostat
    • Built-in pump and expansion vessel
    • Compatible with Unvented systems

    3rd Place

    3rd place due to being an excellent boiler with reliable internal components meaning that you can’t go far wrong with the Vaillant EcoTec series system boilers.

    Price: This boiler usually costs around £1500 with an installed price of £2000+

    Want a quote?

    With us here at Let’s Heat you can get an online quote now to see how much we can install it for.

    And please remember that whoever you use to install your boiler, please ensure that they are gas safe registered, as we are and that they have a great review score for their workmanship see our 4.9 Trustpilot rating here!

    What’s the average cost of a system boiler in 2021?

    The average system Boiler costs for 2021 is £1,750.

    The low end of the range is around £1000, whilst the top end of the range are around £3000.

    Remember that boilers are one of the most important features of your home in terms of use and cost, so picking the right one is important. 

    If you need help making your decision feel free to contact us.

    New Boiler Cost

    All Boiler Types:

    Confirmation of the four main types of boilers and heating systems:

    1. The Common, Heat Only Boiler
    2. A System Boiler
    3. Combi Boilers
    4. The new Heat Pumps!

    The boiler installation & repair team are all fully qualified to the highest standards and take pride in producing exemplary work standards which include completing all boiler installation requirement no matter what time or day this is required!

    The full range of heating & plumbing services provided by Let’s Heat are as follows:

    • Boiler Repairs & Installations
    • Boiler Supply & Fit
    • Financing Your Boiler
    • Emergency Boiler Repairs & Installations
    • Emergency Boiler Supply & Fit
    • Plumbing Repairs
    • Bathroom Plumbing
    • Kitchen Plumbing
    • Emergency Plumbing Repairs
    • Bathroom Plumbing in Emergencies
    • Emergency Kitchen Plumbing
    • General Plumbing Services
    • Emergency Plumbing Services
    • Emergency Gas & Heating Engineer

    Areas covered by our Boiler Replacement Services:

    The Let’s Heat engineers cover all of Wales & England


    Let’s Heat provide Heat Pump installations throughout Wales, including areas like; South East Wales, South Wales, South West Wales, Mid Wales, East Wales, West Wales, and North Wales.

    This includes the cities of Wales like; Cardiff, Newport, Swansea, and all other towns and cities in Wales


    Let’s Heat provide Heat Pump installations  throughout England, including areas like; South West England, South East England, East Midlands, West Midlands, North West England, and North East England.

    This includes the cities of England like; London, Reading, Southampton, Portsmouth, Bristol, Exeter, Plymouth, Gloucester, Swindon, Oxford, Leicester, Nottingham & Derby.

    And other cities like; Birmingham, Worcester, Wolverhampton, Walsall, Liverpool, Manchester, Leeds, York, Sheffield, Newcastle, Sunderland and Middlesbrough, etc.

    Any more questions?

    If you have any further questions about Heat Pumps or Boilers, please see our FAQ Page because you might find the answers there or on our News Blog.  If you want to check out our Gas Safe Registration or want to see our near 5 star Trustpilot rating please click the relevant link!


    Who qualifies for a boiler grant?

    For boiler grants you have to receive a qualifying benefit. In addition to owning your own home and your boiler must be over 5 years old.

    Will a new boiler save me money?

    Upgrading to a new modern combi boiler is likely to save you between 20-35% on your gas bills. Especially if your boiler is very old.

    Who is entitled to a free boiler replacement?

    You may be entitled to a free replacement boiler, If you’re 60 or over and receive Pension Credit.

    Are combi boilers cheaper to run?

    Combi boilers are very efficient compared to older boiler. In fact, it is estimated that replacing your boiler with a newer combi boiler could help you to save up to £300 a year on heating bills.

    How long do boilers typically last?

    around 15 years.