The Best System Boiler in 2024

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The Best System Boiler in 2024

Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: January 29, 2024. Updated: February 15, 2024

We understand that searching for the best system boiler can be a challenging task with so many different boiler manufacturers, outputs and options available.

That’s where we come in. As an independent boiler installation company, we’ve done the hard work for you and compiled this guide of the best system boilers available in 2024.

What makes the best system boiler?

The first thing to consider when choosing the best system boiler for you is the power. No matter the brand, it will need to be powerful enough for your home but not too powerful it costs too much money to run.

At Boilerhut, we have a team of engineers with years of experience. We have called upon them to produce a list of the best system boiler brands and models available in 2024.

In addition to the engineers’ experiences installing these boilers, we have also considered the following: price, warranty, design, material quality, flow rate, customer feedback and customer service.

We’re always happy to give you a quote, and we’re confident we can get you a great deal on the best system boiler that will last you a long time.

Best system boiler brands

We’ll start with the best system boiler brands.

Boiler companies like Viessmann, Worcester Bosch and Vaillant are trusted names not just within the UK, but all around the world. They are known as premium, top-of-the-line boiler brands. Brands like Alpha and Ideal fall in the affordable or budget boiler category.

Here are our top 5 best system boiler companies, in order:

  1. Viessmann – innovative engineering with patented stainless steel heat exchangers, high efficiency and long warranty periods.
  2. Worcester Bosch – well made and regarded across the UK. Good warranties and availability.
  3. Alpha – a fast-growing brand with stainless steel heat exchangers for great efficiency over time.
  4. Vaillant – great German-designed, British-built boilers.
  5. Ideal – an almost 120-year-old company creating a wide range of boilers.

Best system boiler models

These are our top 5 best system boilers available right now.

  1. Viessmann Vitodens 100-W – A great boiler that is well-priced. With 94% efficiency, a stainless steel heat exchanger and integrated WiFi this boiler is perfect for almost every home.
  2. Viessmann Vitodens 200-W – The most efficient boiler you can buy. 98% efficient and with a modulation of 1:17 this boiler is top-of-the-line. The only reason it’s not #1 is because it’s more expensive than the Vitodens 100-W.
  3. Alpha E-Tec NXS – The latest iteration of the E-Tec model. Comes with a new stainless steel heat exchanger and modulation of 1:6.
  4. Baxi 800 System 2 – A compact boiler with s stainless steel heat exchanger and 10-year warranty.
  5. Worcester Bosch 8000 Life – A modern and sleek boiler with good modulation and range of power outputs.

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1. Viessmann (Best System Boiler Brand)

Best system boilers - Viessmann top the list | Boilerhut

Although not as well known as Worcester Bosch, we are confident that Viessmann offers the best system boilers available in the UK. Their patented stainless steel heat exchangers and integrated WiFi ensure your boiler us highly efficient and can be looked after by Viessmann remotely.

Our engineers’ thoughts on Viessmann 

Viessmann boilers are not the easiest to install, but they are not the hardest either. They are great boilers with good components designed to last a long time.

All Viessmann boilers are A-rated with the Vitodens 200-W being 98% efficient. With backlit touchscreens and a modern, sleek finish the whole Vitodens range are great for any home.

Main Features

  • Stainless steel heat exchanger
  • High modulation ratio of 1:8 (050-W model), 1:10 (100-W model), and 1:17 (200-W model)
  • A rated
  • MatriX pre-mix cylinder burner and an integral AquaBloc hydraulic unit
  • Very quiet boilers
  • Compatible with an external weather detector
  • LCD touchscreen
  • Wifi and remote monitoring for ongoing support
  • 20% Hydrogen ready

Overall, we recommend Viessmann system boilers above all others due to its quality, performance, lengthy warranty and price. You can read our more detailed thoughts on these boilers in our Viessmann section >

2. Worcester Bosch

worcester bosch boiler range

Worcester Bosch has been a permanent fixture in the UK boiler market since being established in 1962. Since then, it has become a household name amongst UK consumers. Many consumers choose the brand time and time again because they know the name or already have a Worcester Bosch boiler installed.

Worcester Bosch has an enviable reputation in the UK. This is for good reason. For many years Worcester Bosch has offered high-quality system boilers to their customers. The global reputation and engineering back up all of these might it has gained since becoming part of the Bosch group in 1992.

Our engineers’ thoughts on Worcester Bosch

Worcester Bosch’s reliance on aluminium for their heat exchangers is what we think let them down. They have good warranties, but if something goes wrong and the heat exchanger fails due to corrosion, your warranty may be void. To view all Worcester Bosch boilers and find out more, visit our Worcester Bosch page >

Main Features:

  • ERP rating: A
  • 94% efficiency
  • LPG compatible
  • Can be used with Greenskies solar panels for energy and cost savings
  • Low energy pump reduces electrical usage
  • 20% Hydrogen-mix ready
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3. Alpha

Alpha E-Tec NX - Best System Boiler | BoilerhutAlpha Heating have been designing heating and hot water boilers for many years. They have a good range, wide variety of power outputs and stainless steel heat exchangers.

Our engineers’ thoughts on Alpha

Alpha is known for being a good mid-tier system boiler brand. Considering its positioning, its use of stainless steel heat exchangers means we install many of them across the country. Alpha also has great warranties of up to 10 years.

Main Features:

  • ERP rating: A
  • 92%+ efficiency
  • LPG compatible
  • Stainless steel heat exchanger

Visit the Alpha page >

4. Vaillant

vaillant boiler range 2023

Vaillant is an award-winning German boiler manufacturer founded in 1874. The company was a pioneer in developing gas-fired central heating and have carried on that expertise up to the present day.

Read more about Vaillant and their boilers >

Main Features:

  • Stainless steel heat exchangers in some models
  • Advanced modulation during low usage to ensure maximum efficiency
  • New high-efficiency pump to reduce energy consumption
  • Stylish contemporary case design
  • Backlit display
  • ErP A rated for both hot water and heating efficiency
  • Quiet Mark accredited

5. Baxi

Baxi 800 - Best system boilers | BoilerhutWith a strong UK presence, Baxi has four sites across the UK. These are in Warwick, Preston, Norwich and Wokingham, whilst the company also has numerous training centres around the UK.

Main Features:

  • ERP rating: A
  • 90%+ efficiency
  • Wide range of power outputs available
  • Compact and easy to install

Read more about Baxi and their boiler range >

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Viessmann Vitodens 100-W - Best System Boiler | Boilerhut

#1. Vitodens 100-W (Best System Boiler model)

Average system boiler-only price from £1,237 (11Kw) – comparing five or more suppliers, including Screwfix and Plumbase. Correct January 2024.

What makes the Vitodens 100-W the best system boiler available:

  • Great for small to medium-sized homes
  • System boilers available from 11kW to 32kW outputs
  • Modulation range of 1:10 – saving you even more money
  • A-rated, 94% efficient condensing boiler
  • LPG compatible
  • Stainless steel heat exchanger
  • Up to 12-year warranty
  • OpenTherm compatibility

Read our full review >

Vitodens 200-W - Best System Boiler | Boilerhut#2. Vitodens 200-W

Average 11kW system boiler-only price from £1,694 (comparing five or more suppliers, including Screwfix and Plumbase. Correct January 2024).

Read our full review >

What makes the Vitodens 200-W one of the best system boilers:

  • Great for small to medium-sized homes.
  • Available in combi and system versions.
  • System boilers available from 11kW to 32kW.
  • Modulation range 1:17.
  • 98% efficient condensing boiler.
  • LPG compatible.
  • Stainless steel heat exchanger.
  • Up to 10-year warranty.
  • 12.3 – 14.3 litres a minute hot water flow rate.
  • OpenTherm compatibility.

#3. Alpha E-Tec NXS

Alpha E-Tec NX - Best System Boiler | BoilerhutAverage system boiler-only price from £1,056 (30Kw) – comparing five or more suppliers, including Screwfix and Plumbase. Correct January 2024.

What makes the Alpha E-Tec NXS one of the best system boilers:

  • Great for small to medium-sized homes
  • Modulation range of 1:6
  • A-rated, 90% efficient condensing boiler
  • LPG compatible
  • Stainless steel heat exchanger
  • Up to 7-year warranty

Read our full review >

#4. Baxi 800 System 2

Baxi 800 - Best system boilers | BoilerhutAverage 18kW system boiler-only price from £1,270 (comparing five or more suppliers, including Screwfix and Plumbase. Correct January 2024).

Read our full review >

The best bits of the Baxi 800 System 2:

  • Great for small to medium-sized homes.
  • System boilers available from 18kW to 30kW.
  • 93% efficient condensing boiler.
  • Stainless steel heat exchanger.
  • Up to 10-year warranty.
  • OpenTherm compatibility.

#5. Worcester Bosch 8000 Life

Worcester Bosch Greenstar 8000 Life - Best System Boiler | BoilerhutAverage 30kW system boiler-only price from £1,763.00 (comparing five or more suppliers, including Screwfix and Plumbase. Correct January 2024).

Full review of the 8000 Life >

Key features of the Worcester 8000 Life:

  • Great for small to medium-sized homes.
  • System boilers available from 30kW & 35kW.
  • 94% efficient condensing boiler.
  • LPG compatible.

Do you need a new system boiler?

If you need a new or replacement system boiler or are looking at having a central heating system installed, get an online quote (it takes less than 1 minute), and you’ll get an instant price. But why choose Boilerhut:

  • Quick system boiler installation. Next day boiler installation.
  • ‘Excellent’ 5* customer satisfaction on Trustpilot.
  • Finance options available for central heating or boiler installation.
  • 10 to 12-year warranty on boilers.
  • Fixed prices. No hidden extras.
  • Get up to three quotes for different-tier boilers.
  • Instant, no-obligation quote in less than 1 minute.

Best system boiler for oil

Navien LCB700 Blue Flame oil boiler

LCB700 Oil Boiler - Best Oil System Boiler | BoilerhutAverage internal 28kW system boiler-only price from £2,337 (comparing multiple suppliers, including Screwfix and Plumbase. Correct January 2024).

Full review of the LCB700 oil system boiler >

Key features of the Navien LCB700 oil system boiler:

  • Internal and external models available.
  • Stainless steel heat exchanger.
  • 93% efficient / A rated.
  • Up to 36kW heat output.
  • 10-year warranty.
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Save up to £590 PER YEAR on your heating bills.
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