Best System Boiler Brands 2023 Re February 6, 2023

Best System Boiler Brands 2023

Best system boiler - man working on the boiler

What are the top system boiler brands in 2023?

We’re checking out the top names around ahead of the New Year during the peak season for upgrading your heating…

Here, we’ll look at the top 5 best system boiler brands on the market, along with their reliability, efficiency, overall performance and everything you need to know to make sure you get the most bang for your buck.

In the UK, system boilers are more common than you think, especially for larger homes that demand a large amount of heating and hot water for a number of baths and showers at once.

We will also look at factors that may affect the price of your new boiler, including warrantyinstallation costs, and kW output.

By the end of this blog, you’ll be up to speed on the best system boiler brands on the market, and if you’re looking for more information, check out the best new boilers to buy in 2021.

Don’t forget to check out our boiler comparison tool. It helps you compare up to three boiler models or brands at a time, so you can find the perfect boiler for your home.

What is this system boiler guide for?

While shopping for a new home gadget or a new sofa may be fun, picking the right system boiler from more than 100 boiler brands is not quite as exciting, but pretty important! Our aim is to help make the process of buying or replacing your system boiler a little bit easier.

What is a system boiler?

A system boiler can usually be found in homes that demand a large amount of heating and hot water.

A System boiler features a separate cylinder for storing hot water. Although the major heating and hot water system components are built into the boiler, the hot water is stored in the cylinder, which means that you can get a constant supply of hot water to all your home water taps and showers at the same time. This makes it the ideal choice for a home with multiple bathrooms.

How do system boilers work?

A system boiler is supplied with cold water directly from the mains. This water is then heated by a heat exchanger (within the boiler), which transfers heat to the water. This newly heated water is then stored in the hot water cylinder, ready to be delivered on-demand as soon as someone turns on the hot water tap. At this point, the electric pump then pushes the hot water through to your taps (and works in the same way to heat the radiators). It’s worth bearing in mind that system boilers are a “sealed system” and can be quite energy-efficient as they can make use of condensing technology. This is where the excess exhaust heat is re-used to pre-heat the cold water and so the system can be known as a “condensing boiler”.

Bear in mind that when you purchase a new or a replacement system boiler, you will need the space to accommodate an additional hot water storage tank – ideally in an airing cupboard.

System boiler pros and cons

Pros

Cons 

Ideal for homes with 2 or more bathrooms

Not as compact as a combi boiler, so you’ll need a large storage tank

Relatively easy to install

Loss of heat from the hot water storage tank, no matter how well insulated

 

Doesn’t require a cold water tank, so you can store more things in the attic!

Hot water is limited to the capacity of the storage tank, once the hot water from the tank is used up, you’ll have to wait for it to heat the water again

Compatible with solar thermal energy. Aaah sunny days! ☀️

 

The best system boiler brands

Here, we look at the top five best system boiler brands on the market. We will also discuss the overall brand scores from the Which? Best Boiler Brand Survey in 2021.

Which? Best Boiler Brand Survey rates the boilers on reliability, efficiency, and overall performance. We also get to see what engineers think about these boiler brands.

1# Worcester Bosch

Worcester Bosch boiler installation handoff

One of the best boiler brands on the market. Formed in 1962 in Worcester, where it imaginatively took its name, Worcester Bosch started off as a small engineering works before growing into the biggest boiler manufacturer in the UK. It was acquired by Robert Bosch Holdings in 1992 to form the Worcester Bosch Group.

Worcester currently holds the Royal Warrant to supply heating to the Royal Family and has won the Which? Best Buy award for their range of boilers for the last ten years. This prestigious award is judged on reliability, build quality, recommendation, and customer score.

​​For a full timeline of Worcester Bosch history, visit their history page.

Not only do Worcester Bosch boilers offer reliable performance, but they are also known for outstanding build quality.

If you’re curious to know what customers and heating engineers said about Worcester Bosch in the Which? Best Boiler brand 2023 survey, check out the reviews:

Overall Score

84%

Reliability

5 stars

Customer score

5 stars

Engineer recommendation

4 stars

Build quality

4 stars

Availability of spares and parts

5 stars

Ease of fixing a common fault

4 stars 

Ease of servicing

4 stars

As you can see from the results, Worcester Bosch was awarded a huge 5 stars for their customer scores and reliability, which supports our claim that Worcester Bosch is one of the best boiler brands on the market. Not only do their boilers offer a high-efficiency rating of 94%, but all their boilers also come with a ten-year standard warranty – (hopefully you won’t need it!)

Worcester Bosch is a boiler brand synonymous with reliability and performance, and a brand regularly recognised by Which? Awards.

Once again, Worcester Bosch didn’t fail to win Which? over. Here’s their verdict:

“Worcester Bosch is one of only two gas boiler brands to earn our Best Buy recommendation, thanks, in large part, to high owner satisfaction and recommendation. Its boilers can be on the expensive side, but build quality is good and heating engineers praised the brand in general. The design of Worcester Bosch boilers can make them a bit difficult to repair, but you’re less likely to need a repair as Worcester Bosch boilers are very reliable.”

When you look at their warranty length below, you’ll know that this brand is built to last – maybe as long as your classic indestructible Nokia phone!

Worcester Bosch boiler model

kW

Efficiency 

Warranty

Average Price

(boiler only)

Greenstar 8000 Life System

30kW, 35kW

94%

10 years

£1,284.78 – £1,423.48

Greenstar 8000 Style System (white or black)

30kW35kW

94%

10 years

£1,345.66 – £1,490.48

Greenstar i system

9kW12kW15kW18kW21kW

94%

10 years

£1,066.80 – £1,150.80

Greenstar 4000 System

12kW15kW18kW21kW24kW

94%

10 years

£1,018.80 – £1,122.00

*Average boiler prices were taken from travisperkins.co.uk

Worcester Bosch Key facts

  • Manufacturer warranty period – Up to 10 years, pretty legendary!
  • Which? Best Buys – For 10 years running!
  • Price range (without installation) – between £1,019 – £1,490
  • Efficiency – 94%+

Worcester Bosch TrustPilot reviews

Worcester Bosch prides itself on its superb customer aftercare. It is something that you can clearly see throughout their excellent Trustpilot reviews and that’s what earned them their 4.6 stars. If you’re not sold yet, read what their customers said about them:

“The service I had from the engineer was brilliant! He went above and beyond what I expected to fix my issue and did some extra bits to improve my boiler and gave me some great advice on how to maintain it.”

“Good efficient boiler. Seems to be very economical. Just had the annual service. No problems.”

For any Worcester Bosch system boiler, get an instant quote now.

2# Viessmann

Viessmann boiler grey kitchen

The Viessmann Group is a German manufacturer of heating, industrial, and refrigeration systems headquartered in Allendorf, Germany. (Wikipedia).

Viessmann’s roots go back even further than Worcester’s, starting in 1928, where Johann Viessmann was asked by a local gardener to build a boiler for his greenhouse. Johann, then a locksmith, thought ‘why not’ (they didn’t have Playstations or Facebook to pass the time back then).

Viessmann innovated on the iron boilers around at the time and built his using steel which heated up faster and used less fuel. Nice work Johann! Soon, all the gardeners in the village wanted one, and Johann got his model patented and set to work.

Since January 2018, the company is led by Martin Viessmann (Chairman of the Executive Board), Maximilian Viessmann (Co-CEO and part-time Bond villain), and Joachim Janssen (Co-CEO). Making Viessmann a family-owned business for four generations, quite a rare thing.

You can find out more about the Viessmann company and the rich history of over 100 years in business yourself, as that could be a blog on its own!

Which? described Viessmann’s system boilers as “A reliable Best Buy” – which is the equivalent of a Paul Hollywood handshake in the boiler world! Here’s what they said about it:

“With a high proportion of satisfied owners and being well-liked by heating engineers, Viessmann boilers are a great Best Buy. These boilers are reliable, and a number of heating engineers in our survey mentioned good build quality. The only minor drawback is that sourcing replacement parts can be a little slow.”

Viessmann Which? Best Boiler Brand Survey Results:

Overall Score

81%

Reliability

5 stars 

Customer score

5 stars 

Engineer recommendation

4 stars 

Build quality

4 stars 

Availability of spares and parts

4 stars

Ease of fixing a common fault

4 stars

Ease of servicing

4 stars

Viessmann boilers bagged an overall score of 81% and a massive 5 out of 5 stars for their customer score, revealing that Viessmann boilers are loved by their customers.

We believe that the Viessmann system boilers are excellent boilers and here are some more reasons why:

Viessmann boiler model

kW

Efficiency 

Warranty

Average Price*

(boiler only)

Vitodens 200-W

11kW19kW25kW32kW

98%

3 years

£1,489.31 –  £1,732.98

Vitodens 100-W

11kW19kW25kW32kW

94%

5 years

£1124.99 – £1,344.12

*Average boiler prices were taken from screwfix.com

Viessmann Key facts

  • Manufacturer warranty period – Up to 5 years
  • Which? Best Buys – Viessmann system boilers are highly recommended by Which?. They are in fact “Which? Best Buy” this year.
  • Price range (without installation) – between £1125 and £1,733
  • Efficiency – 94%+

Viessmann TrustPilot reviews

Although Viessmann UK only has 2.4k reviews, over 89% of those are above average on Trustpilot. Here are what customers have to say about Viessmann boilers:

“Excellent product and does what it says on the tin.”

“I was extremely happy with the installation and the product is magnificent.”

If you’re looking to buy a new boiler then get a boiler quote from WarmZilla. It only takes two minutes, you don’t need to have any technical knowledge, and it’s all done online. Easy!

3# Vaillant

No heating or hot water

Before we get into the nitty-gritty of customer reviews and brand performance, let’s talk a little about the history behind the brand.

Vaillant was formed way back in 1874 by Johann Vaillant in Remscheid, Germany. Johann Vaillant, the tenth child in his family, founded his own workshop as a copper beater and pump maker.

Many inventions have been credited to Vaillant over the years including modern-day central heating in 1924. Previously each room was heated individually by stoves or fireplaces until Vaillant introduced the central heating boiler that could heat multiple radiators simultaneously – revolutionising home heating.

The Vaillant boiler range has been given a Which? Best Buy award. They have also been awarded a Quiet Mark Accreditation, from the Noise Abatement Society for their quiet running boilers.

For a full timeline of the Vaillant, company history click here.

Now, let’s get into the juicy bit. Let’s see what customers really think about Vaillant boilers.

Vaillant boilers were awarded the best overall score in the Which? Best Boiler Brand survey 2021.

Vaillant Which? Best Boiler brand 2021 survey results:

Overall Score

76%

Reliability

4 stars 

Customer score

4 stars 

Engineer recommendation

5 stars 

Build quality

5 stars 

Availability of spares and parts

5 stars 

Ease of fixing a common fault

5 stars 

Ease of servicing

4 stars 

Vaillant have smashed it out of the park when it comes to their overall brand score for the Which? Best Buy Survey in 2021.

We can see from the survey results that Vaillant are consistent in all categories with nothing below 4 stars, conveying that they are a great boiler brand with efficient and reliable boilers which their customers love.

Here is what Which? has to say about Vaillant:

“Vaillant boilers were a Best Buy in 2020 and are highly regarded by heating engineers who say they’re good quality and easy to work on and source parts for. However, they’re not entirely without problems and Vaillant’s lower customer score this year means it’s no longer a Best Buy.”

Vaillant boiler model

kW

Efficiency 

Warranty

Average Price

(boiler only)

EcoTEC Plus High kW System Gas Boiler

30kW, 37kW, 48kW64kW

94%

5 years

£1,347.70 – £1,491.17

EcoTEC Plus System Gas Boiler

12kW15kW18kW24kW

92%-94%

5 years

£932.57 – £1,116.02

EcoTEC Green IQ System Gas Boiler

27kW

94%

5 years

£1,397.99

EcoFIT Pure System Gas Boiler

12kW15kW18kW25kW30kW

94%

2 years

£836.86 – £1,065.46

*Average boiler prices were taken from travisperkins.co.uk

Vaillant Key facts

  • Manufacturer warranty period – Up to 5 years
  • Which? Best Buys – Yes. In 2020, Vaillant boilers were a Best Buy.
  • Price range (without installation) – between £837 – £1,491        
  • Efficiency 92%+

To see all the benefits for yourself, have a look at our boiler comparison tool which allows you to compare your current heating system to this bad boy and see if you need to get yourself a new boiler!

Vaillant TrustPilot reviews

Vaillant has a rating of 4.6 out of 5 stars on Trustpilot from over 15k reviews. With over 90% of Vaillant’s reviews being above average, customers can be confident that they are dealing with a reliable and efficient boiler brand that cares about its customers.

Here are some Trustpilot reviews to support this statement:

“I had a brand new Vaillant EcoTec Pro installed recently and I love it, could not ask for better with both the boiler and WarmZilla who I purchased it from. Great service and a great boiler, I’m so glad I have hot water again, I’m just waiting on receiving my guarantee paperwork, I’m really really happy with everything”

“I’m really pleased with my new Vaillant, it’s very quiet and easy to use. Would highly recommend.”

Similarly to Worcester Bosch, Vaillant’s reviews not only show how satisfied customers are with their boilers but also with their customer service.

In general, Vaillant boilers have warranties of 2-7 years depending on the model and whether certain terms are met, which is pretty good.

To get a boiler quote in minutes, click here.

4# Ideal

ideal-boiler-1920x1100px

Ideal boilers were founded in 1905, giving them over 100 years of experience in delivering boilers to homes throughout the UK.

Ideal is one of the pioneers in bringing high-efficiency boilers to market and they continue to bring reliable, efficient boilers to market to this day.

One of the first modern-day boilers was brought to market by Ideal in 1920 and is known as the Cookanheat. The Cookanheat was a freestanding stove that combined an open fire, central heating boiler, cooking oven, and hot cupboard.

Ideal boilers have come a long way from the days of Cookanheat, offering a range of boilers that offer high efficiency at a very reasonable price.

For more information on Ideal’s brand history, click here.

Which? Best Boiler Brand Survey in 2021, gathered insights about the Ideal system boiler and here are the results:

Overall Score

74%

Reliability

5 stars 

Customer score

4 stars

Engineer recommendation

4 stars

Build quality

4 stars 

Availability of spares and parts

5 stars

Ease of fixing a common fault

4 stars

Ease of servicing

4 stars

To top it up, this is what Which? Said about the ideal system boiler:

“The feedback from heating engineers about Ideal boilers is generally positive. They’re keenly priced and viewed as suiting landlords and those on a budget, but there can be problems with lower-quality parts. Few Ideal boiler owners in our survey have experienced any issues though, and Ideal sits in the top half of the boiler brands we’ve reviewed.”

To dig deeper into the range of ideal system boilers, we’ve put together this side by side comparison table:

Ideal boiler model

kW

Efficiency 

Warranty

Average Price

(boiler only)

Vogue Max System Gas Boiler

15kW18kW26kW32kW

92%-93%

10 years

£1,099.61- £1,423.32

Vogue Gen2 System Gas Boiler

15kW18kW26kW32kW

92%- 93%

10 years

£1,111.97 – £1,423.32

Logic System Gas Boiler

15kW, 18kW, 24kW, 30kW

93%

2 years

£921.41 – £1,173.86

Logic Plus System Gas Boiler

15kW, 18kW24kW30kW

93%

7 years

£921.41 – 

£1,074.35

Logic Max System Gas Boiler

15kW18kW24kW30kW

94%

10 years

£921.41 – £1,173.86

*Average boiler prices were taken from travisperkins.co.uk

Ideal Key facts

  • manufacturer warranty period – Up to 10 years
  • Which? Best Buys – Not yet! But watch the space.
  • Price range (without installation) – between £921 – £1,423
  • Efficiency – 92%+

Ideal System boilers are one of the cheaper system boilers on the market with a high-efficiency rating from 92% to 94%, making them ideal for those looking for a reliable boiler on a budget.

The Ideal Logic System boilers come with a standard 2-year warranty from the manufacturer, which is significantly lower than other boiler brand warranties. However, when purchasing an Ideal boiler with WarmZilla, you will receive an 8-year warranty.

Although system boilers need an additional hot water tank, typically installed in the airing cupboard of your home, Ideal boiler units are designed to be compact and lightweight, perfect for installation in a standard kitchen cupboard – which may sway your decision.

The prices shown in the comparison tables are taken from an online central heating supplier and do not include installation or labour costs. This is probably a great time to mention that all WarmZilla boiler prices include Gas Safe installation as standard. It also includes a system filter, a system cleanse, guarantee, smart thermostat, and any other bits and bobs you need to get your boiler up and running.

Ideal Trustpilot reviews

93% of Ideal’s Trustpilot reviews are above average, 87% of these being excellent reviews.

Here are a couple of customer reviews:

“Ideal great customer service and excellent knowledge. Would highly recommend them.”

“Everything was completed in a very professional way. Excellent service.”

From looking at Ideal’s Trustpilot reviews, the majority discuss the installation process and the company’s customer service or aftercare.

Fancy getting a quote for an Ideal system boiler? Click here.

5# Baxi

Baxi boiler isolated
Founder Richard Baxendale opened the doors to his new company in 1866. By 1955, Baxi became a household name for heating. Bermuda, Baxi’s most famous gas-fired boiler was launched in 1966, the same year in which Baxi celebrated 100 years in business. For more information on Baxi’s history, you can click here. In the Which? Best Boiler Brand Survey in 2021, Baxi boilers were awarded an overall brand score of 76%. Baxi Which? Best Boiler Brand Survey Results:
Overall Score76%
Reliability5 stars
Customer score4 stars
Engineer recommendation4 stars
Build quality4 stars
Availability of spares and parts5 stars
Ease of fixing a common fault4 stars
Ease of servicing5 stars
Put simply, Baxi system boilers are great boilers with excellent reliability and ease of service. Here is what Which? had to say about Baxi boilers:
“Baxi is one of only three brands to earn five stars for ease of servicing. Parts availability is good and reliability is excellent. Baxi narrowly misses out on our Best Buy recommendation: engineers aren’t quite as emphatic about build quality and the brand achieves a slightly lower customer score than the very best gas boiler brands in our survey.”
Here you will see our side-by-side comparison:
Baxi boiler modelkWEfficiency WarrantyAverage Price (boiler only)
Platinum+ System Gas Boiler32kW93%10 years£1,064.99
Megaflo System Gas Boiler15kW18kW24kW28kW32kW91%-92%7 years£791.98 – £1,059
800 System Gas Boiler18kW24kW93%10 years£994.99 – £1,034.99
600 System Gas Boiler15kW18kW24kW93%7 years£892.99 – 999.99
*Average boiler prices were taken from screwfix.com

Baxi Key facts

  • Manufacturer warranty period – Up to 10 years
  • Which? Best Buys – not yet. 
  • Price range (without installation) – between £792 – £1,065
  • Efficiency – 91%+

Baxi TrustPilot reviews

Baxi has over 4.5 stars on Trustpilot and over 35k reviews. Over 86% of Baxi’s reviews are above average, showing that these are again, another great boiler brand. Baxi has won many awards including Gas Industry Award in 2017, for both customer service and energy efficiency.

Here are some customer reviews:

“The engineer did an excellent job, going above and beyond in terms of service. The boiler was just meant to undergo a service but I had a problem with it resulting in no heating, which the engineer kindly sorted. Moreover, the engineer kindly informed me how to use the heating system efficiently. The engineer was in general very helpful and friendly and gave excellent service.”

“Fantastic, thorough, friendly service today. Went above and beyond to talk me through each step furthering my understanding of my boiler and system. Came on time and left the place tidy. Thank you very much.”

Unfortunately, WarmZilla don’t sell Baxi boilers currently, however, if you like the look of a Baxi boiler, you can use our Boiler Comparison tool which allows you to compare up to three boiler models or brands at a time. We’re all about helping you to find the perfect new boiler for your home!

Write a comment
Your email address will not be published.