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  • The Best Brands of System Boilers & Pricing

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    • Blog
    • The Best Brands of System Boilers & Pricing

    Updated: April 5, 2024

    Are you in the market for a new system boiler and looking for the best brands and pricing options? Choosing the right system boiler is crucial for efficient heating and hot water supply in your home. In this comprehensive guide, we’ll introduce you to some of the best brands of system boilers and provide you with an overview of their features and pricing.

    What are the best system boilers in the UK?

    Viessmann Vitodens 100-W System, Worcester Bosch Greenstar i System and Vaillant ecoTEC Plus System are among the best brands of system boilers in the UK.

    Here’s all you need to know about the Best System Boilers

    To begin with, system boilers are very common in the UK. Accordingly, you should find the best system boilers, boiler brands and pricing for you to see. 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 boiler installation guide!

    Best System Boilers for this year, 2024 and beyond!

    Please 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: Firstly, 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 owner who wants a top-quality but affordable system boiler. Not to mention, the Viessman Vitodens 100-W comes in 26kW, 30kW as well as 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. To sum up, this system boiler rates ‘A’ Class in the SEDBUK energy efficiency ratings.

    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 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 Trustmark rating here!


    # Worcester-Bosch

    Model: Worcester-Bosch Greenstar 24i System Boiler Reviews

    Details: To point out, the Worcester-Bosch Greenstar 24i System Boiler is one of a range of highly energy-efficient A-rated gas boilers from Worcester-Bosch. Firstly, 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. As a result, the Greenstar 24i is a quick and easy Boiler to install which can being down the installation cost. What’s more, it is efficient and economical to run.

    Main Features:

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

    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: 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 Trustmark rating here!

    # Vaillant

    Model: Vaillant ecoTEC Plus System Boiler

    Details: To begin with, the Vaillant ecoTec boiler range is a fantastic and low energy consumption system boiler. Additionally, the Vaillant ecoTEC has excellent performance for hot water and central heating which results in lower energy costs for you. As a result, the Vaillant ecoTec 30kW is the most popular size boiler in this range. It also has: 12kW, 15kW, 18kW, 24kW, 30kW and 37kW models available.

    Undoubtedly, 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. In conclusion, 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.

    Read more: Best Heat Only Boilers, Boiler Brands & Prices

    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 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: 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 Trustmark rating here!

    Read about: Best Air Source Heat Pumps and Prices

    Genuine Vaillant Boilers Review

    What Are The Advantages of System Boilers?

    A large supply of hot water

    Generally, with a system boiler you can store large quantities of hot water to use later on. This is very useful when you are using multiple taps, showers and radiators at the same time.

    The ability to use solar energy.

    Without a doubt, connecting the correct cylinder to the system will enable you to use solar panels. This is not only environmentally friendly but it is also cost-effective and will save you some money.

    Needs less space than a regular boiler

    Of course, system boilers are easier to install and need less space than regular boilers. Moreover, they do not need an expansion tank or external expansion vessels

    Economical and fast

    Lastly, system boilers consist of a pump. As a result, they respond fast and have more economic running cost

    Read more: Combi boilers common faults  

    What’s the average cost of a system boiler in 2023?

    The average system Boiler costs for 2023 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.

    System boilers usually cost between £500 to £2000. Their cost mainly depends on their size, model and manufacturer.

    Homes with high hot water demand might need Premium models. These models can cost upwards of £1500. On the other hand, smaller homes will need boilers that would cost much less.

    Baxi and Worcester Bosch models are available at a low price. Baxi 800 and Worcester Bosch Greenstar i prices range starts at about £900. On the other hand, the Vitodens 200-W range by Viessmann is the most expensive. It can cost around £1,500.

    Here is a look at system boilers prices excluding installation:

    Baxi 800       £900 – £1,000
    Vaillant ecoTEC Plus£1,000 – £1,250
    Ideal Vogue Max£1,000 – £1,250
    Worcester Bosch Greenstar i£900 – £1,100
    Viessmann Vitodens 200-W£1,250 – £1,500

    Keep in mind that replacing or installing a hot water cylinder will add to the cost as well as installation.

    In addition to system boiler installation we also fit other boiler types like;

    Other Boiler Types:

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

    Finance for your system boiler…

    To point out, buying a new boiler and having a boiler installation or a heat pump, is an investment. However, it can be expensive, especially paying for it all in one hit. You can get the job done on a finance package that is FCA-approved if you don’t have enough money on hand. Furthermore, we can also offer a number of split payment options for you to consider.

    Boiler Replacement Payment Options

    In short, for new boiler installation, you can pay by card, pay zero deposit, and pay monthly over 2 to 10-years or take our a finance package.

    Read more: Best Condensing Boilers of 2024

    What are the latest UK energy regulations?

    Over the last few years, the UK has passed several government guidelines for boiler installation and energy efficiency. At any rate, these guidelines need to be followed. please remember:

    • Gas boilers should have at least a 92% ErP efficiency regardless of boiler type.
    • A Combi boiler installation should have one energy-saving feature.
    • Thirdly, you should have functioning time and temperature controls.

    Read about: Boilers On Finance | Pay Monthly Finance In Uk

    So why Lets Heat for your system boiler replacement?

    A. smartadapt Are Quality & Accredited Boiler Installers

    Let’s Heat professional engineers and emergency plumbers provide a professional and reliable emergency plumbing and heating service.

    Our Coverage

    To bging with, this service includes Boiler Installation and Heat Pump Installation, in Cardiff and the surrounding CF postcode areas of South Wales. We cover the rest of Wales and all of England (see below). In addition, The installation & repair team are all fully qualified to the highest standards. Furthermore, we take pride in producing exemplary work standards which include completing all boiler installation requirements regardless of the time and day.

    Qualifications & Accreditations:

    Our team of high-quality professional engineers has an extremely high 4.9 out of 5, Trustpilot score given by our previous happy customers. We are fully accredited by Gas Safe and Corgi registered, as well as FCA approved for all of our financial transactions.


    All of our staff at Let’s Heat are experts in their field and have gathered many years of experience, working on a wide selection and variety of emergency plumbing and heating solutions and services throughout Cardiff, the rest of Wales and the UK.

    B. Because we care…

    Overall, are you still a little confused about where to start or who to use? Our easy-to-use online questionnaire will guide you through everything that you, and we, need to know in order to ensure that you have the correct solution for your needs. All things considered, we will ensure that you are completely satisfied with the solution offered prior to completing any works.

    Why else?

    • To begin with, Cover Cardiff and surrounding areas of South Wales
    • Reliable, professional, and trustworthy
    • High Trustpilot score of 4.9 out of 5.
    • Gas Safe Accredited (corgi registered),
    • Our prices are very competitive
    • Our Finance is FCA accredited
    • We ensure that your house is kept clean and tidy during any work
    • All workmen use floor protection on each job
    • We always make sure your rubbish is correctly disposed of
    • The Service comes with a 12-month snag guarantee
    • To sum up, We travel anywhere throughout the UK

    Get an Online Quote

    Firstly, You can research your boiler replacement requirements and choose your new boiler and the boiler installation online, without leaving the house. Secondly, if you need a new system boiler or heat pump and installation, please do not hesitate to reach out to our award-winning heating engineers team because they have more information. Lastly, when you’re ready for a new boiler or heat pump then you can get everything, including the full boiler replacement from us here at Let’s Heat.

    Next Day Service

    Above all, we replace & install boilers and heat pumps nationwide and include next-day installation (on orders placed before 12/2 pm in Spring/Summer or Autumn/Winter. Chiefly, All of our staff are experienced and knowledgeable in all aspects of heating installation services and repair and maintenance. So if you have any further questions please feel free to contact us. In conclusion, please take a look at our FAQS or blog, should you have any other questions.

    Read more: Worcester Bosch Greenstar 8000 Life Combi Boiler Review 

    Full range of heating & plumbing services provided by Let’s Heat:

    • 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

    Read about: Best Heat Pumps, Brands & Pricing

    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 such as South East Wales, South Wales, South West Wales, Mid Wales, East Wales, West Wales, and North Wales.

    Welsh Cities:

    This includes all of the Welsh cities such as Cardiff, Newport, Swansea, and all other towns and cities in Wales.


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

    English Cities:

    This includes all of the English cities such as London, Reading, Southampton, Portsmouth, Bristol, Exeter, Plymouth, Gloucester, Swindon, Oxford, Leicester, Nottingham, Derby, Birmingham, Worcester, Wolverhampton, Walsall, Liverpool, Manchester, Leeds, York, Sheffield, Newcastle, Sunderland as well as Middlesbrough, etc..

    If you have any further questions about System boilers, other Boilers, or anything else, please see our FAQ Page because you might find the answers there or on our News Blog.

    Check out our Gas Safe Registration or want to see our near 5 star Trustpilot rating please click the relevant link!

    Read more: Boiler Replacement And Installation Guide

    Top UK System Boilers


    What the difference between a system boiler and a regular boiler?

    A system boiler is a sealed system that would only require a boiler and a cylinder. On the other hand, a regular boiler might need a header tanks in the attic to feed the hot water cylinder and also to maintain the water level in the radiators.

    What are the advantages of a system boiler?

    With a system boiler Hot water is always available. They are Energy-efficient and environmentally friendly. There is no need for a cold water tank. And finally, flow rates tend to be high and at mains pressure.

    Does a system boiler need a tank?

    Unlike regular boilers, system boilers do not need an expansion tank or external expansion vessels. This makes them both easier to install and need less space.

    How much does a system boiler cost?

    System boiler prices vary between £470 to £2,600, depending on the model and make you go with. You can expect to pay anything between £470 to £2,600 for a system boiler.

    How long do system boilers last?

    Most modern boilers last for anywhere between 10 to 15 years on average. However, if you have an older one approaching the end of its life, it might be the right time for you to consider getting a new one.