What are the top UK system boilers?

The top UK system boilers are Viessmann, Worcester-Bosch, Vaillant and Baxi. You can check this page to get more information about the best UK system boilers.

Top UK System Boilers
Top UK System Boilers 1

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

System boilers are very common in the UK, so please find the best system boilers, boiler brands and pricing for you to see.

The top UK system boilers are 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!

Top UK System Boilers for this year, 2022 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

System Boiler Brand: Viessmann

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.

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!

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System Boiler Brand: Worcester-Bosch

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.

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!

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System Boiler Brand: Vaillant

Vaillant Logo 2005

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 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 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!

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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.

Other Boiler Types:

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

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

All of our Installations follow the latest UK energy regulations…

Over the last few years, the UK has passed several government guidelines for boiler replacement and energy efficiency, which now need to be adhered to for all boiler replacements, so please remember:

  • If you have a gas boiler, it must have at least a 92% ErP efficiency regardless of boiler type.
  • A Combi boiler installation requires one energy-saving feature
  • You must have functioning time and temperature controls

Can I finance my new system boiler?

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.

If you haven’t got the money on hand for the boiler and installation services that you require, you can get the job done on a finance package that is FCA-approved.

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FCA-Accredited Finance

We can also offer a number of split payment options for you to consider.

Boiler Replacement Payment Options

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.

So why Let’s Heat for your system boiler replacement?

A. Let’s Heat 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

This service includes Boiler Installation and Heat Pump Installation, in Cardiff and the surrounding CF postcode areas of South Wales.

We also cover the rest of Wales and all of England (see below).

The 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 requirements no matter what time or day this is required!

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 and we are fully accredited by Gas Safe and Corgi registered, as well as FCA approved for all of our financial transactions.

Experts:

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 & the UK.

B. Because we care…

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.

We will also ensure that you are completely satisfied with the solution offered prior to completing any works.

Why else?

  • 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),
  • We have very competitive prices
  • 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
  • We travel anywhere throughout the UK

Get an Online Quote

You can research your boiler replacement requirements and choose your new boiler and the boiler installation online, without leaving the house…

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.

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.

Can I get Next Day Service?

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.

All 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.

Alternatively please take a look at our FAQS or blog, should you have any other questions.

Get an online quote

Areas covered by our Boiler Replacement Services:

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

WALES:

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.

Welsh Cities:

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

ENGLAND:

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.

English Cities:

This includes all of the Southern English cities like; London, Reading, Southampton, Portsmouth, Bristol, Exeter & Plymouth.

As well as Midland cities like; Gloucester, Swindon, Oxford, Leicester, Nottingham, Derby, Birmingham, Worcester, Wolverhampton & Walsall.

And Northern cities like; Liverpool, Manchester, Leeds, York, Sheffield, Newcastle, Sunderland and Middlesbrough, etc.

Any more questions?

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!

⭐️⭐️⭐️⭐️⭐ Get a quote online now!

Top UK system boilers FAQs

  1. What are the advantages of a system boiler?

    One of the main advantages of having a system boiler is that Hot water is always available. What’s more, they energy-efficient and environmentally friendly. They also don’t require a cold water tank. Lastly, flow rates tend to be high and at mains pressure.

  2. Are system boilers efficient?

    System boilers have an efficiency rating of 94%. If you want to boost your home’s efficiency, then you can invest in a new energy-saving system boiler.

  3. Does a system boiler need a tank?

    Different from regular boilers, system boilers neither need an expansion tank nor external expansion vessels. As a result, they are both easier to install and need less space.

  4. Can a system boilers heat water and radiators at the same time?

    System boilers are able to maintain both the radiators and water without losing pressure. System boilers, without a doubt, do not prioritise where heat is distributed. But they can run out of hot water if you use more than is there in the tank.

  5. Can I use a power shower with a system boiler?

    Yes, system boilers are compatible with power showers.