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Witten by Bernard Morgan (Engineer).
First Published: March 5, 2021. Updated: February 8, 2024

The Top 5 Best Condensing Boilers in 2024

We get a lot of questions about the best condensing boilers.

Since 1st April 2007, it has been a legal requirement that all gas and oil boilers installed must be condensing boilers.

In short, every boiler manufactured in 2024 has to be a condensing boiler. This is regardless of the type of boiler: open vent, sealed system, or a combi.

If you want an in-depth look at the best boiler brands and their top models, you can read our “10 Best Boiler Brands & Models in 2024” guide here >

This page will focus on the top 5 best condensing boilers in the UK. Here are our top 5 condensing boilers:

There are a lot of options when it comes to the best condensing boilers.

You need to understand the type of boiler you need, how many radiators it’s going to power, if you need a hot water cylinder or not and a bit more.

If at any time you need help, give us a call for a free, no-obligation quote. We install boilers and central heating all across the UK. Our years of experience can help, and we don’t even need to visit until you want to buy a boiler from us and we come to fit it.

The best condensing boilers can seem pretty similar. But there are differences everyone should know about.

That’s where we come in. We’ll look at value for money, warranty, design, quality and customer service. The prices are correct as of mid-January 2024.

Before we start, everyone’s knowledge is different. So here are a couple of guides that may help with your understanding:

Right, to the boilers…

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#1. Viessmann Vitodens 200-W

Winner: the best condensing boiler!

Viessmann Vitodens 200-W | BoilerhutThe Viessmann Vitodens 200-W is easily the best condensing boiler available today, in our opinion.

It is up to 98% efficient and can modulate (run at reduced power) at 1:17, saving you money. Available as a combi and system boiler, the 200-W is expensive but great value. It will save you money on your bills, no matter what you’re upgrading from.

The Vitodens 200-W comes highly recommended by Which? Trusted Traders heating engineers and customers alike.

The efficiency is due to the boiler’s high quality internal components. It also uses weather compensation technology which takes into account the outside temperature.

The Vitodens 200-w also has WiFi built in. This enables it to be controlled remotely and enable it to be used with smart thermostats for increased efficiency.

Our Viessmann Vitodens 200-W Review will be able to tell you more about this boiler.

The Vitodens 200-W combi is available from £1,983.
The Vitodens 200-W system is available from £1,694.
(Boiler-only prices.)

Manufacturer Viessmann
Model Vitodens 200-W
Condensing Yes
Efficiency Rating 98%
Modulation rage 1:17
Energy Efficiency Class A Rated
LPG Compatible Yes
Warranty Up to 10-year comprehensive warranty
Combi Power Outputs: 30kW & 35kW
Combi Hot Water Flow Rate: Up to 17 litres/minute
System Power Outputs: 11kW, 19kW, 25kW & 32kW
Mounting Wall Mounted
Weight 34.5kg to 47kg
Dimensions 850 mm (Height) x 450mm (Width) x 360mm (Depth)

Vitodens 200-W Key Features

  • Up to 98% of the fuel used is converted into heat
  • Quiet operation thanks to low fan speed
  • Compact dimensions, only 450 mm wide
  • Easy to operate Vitotronic control unit with 5-inch colour touchscreen
  • Control via app and internet
  • System boiler: Cascade with up to six boilers up to 594 kW possible
  • Environmentally responsible MatriX cylinder burner
  • 10-year warranty from Boilerhut
  • Modulation range 1:17
  • WiFi and remote monitoring for enhanced fault diagnosis
  • 20% Hydrogen-mix ready
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#2. ATAG iC Economiser Plus Combi

best condensing boiler, ATAG

ATAG is not vey well known here in the UK. They have, however, been designing boilers in The Netherlands for 70 years. They have been the recipient of many awards and, for this reason, are held in high regard.

The ATAG iC Economiser Plus is an excellent example of quality from ATAG. This showcased their 18-year statement warranty. Yes, 18 years. The heat exchanger is also guaranteed for the life of the boiler.

The efficiency is good too at 94%. They use an iCon heat exchanger designed to maintain 98% of it’s efficiency for 18 years or more. Like the 200-W above, the Economiser comes with weather compensation technology.

This boiler comes highly recommended by us. It’s efficient, but not the most efficient and has the best warranty. But, it is expensive.

The iC Economiser Plus Combi is available from £3.030.

Manufacturer ATAG
Model iC Economiser Plus
Condensing Yes
Efficiency Rating 94%
Energy Efficiency Class A Rated
LPG Compatible Yes – with a conversion kit
Warranty 12-year standard and up to 18-year comprehensive warranty
Combi Power Outputs: 23kW and 31kW
Combi Hot Water Flow Rate: Up to 17 litres/minute
Mounting Wall Mounted
Weight 43kg to 46kg
Dimensions 700mm (Height) x 440mm (Width) x 366mm (Depth)

ATAG iC Economiser Plus 35 Key Features

  • Up to 18-year warranty available
  • Stainless steel heat exchanger
  • Stainless steel and brass components
  • Instant hot water with pre-heat facility
  • Built-in passive flue gas heat recovery device
  • Built-in weather compensation technology
  • Achieves ErP ‘A’ rating for heating and hot water
  • Wi-Fi compatible
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#3. Viessmann Vitodens 100-W

Viessmann Vitodens 100-W - Best Condensing Boilers | BoilerhutThe Vitodens 100-W is Viessmann’s best-selling gas and LPG condensing boiler. It is the most popular boiler we installed and was awarded Which? Best Buy three years in a row.

It offers affordability and great efficiency with quiet operation, all in a small unit. It is available as a combi, system or regular boiler meaning it’s flexible too.

It really is a great boiler. It’s not quite as efficient as it’s bigger brother, the 200-W but it’s 94% efficient and comes in a range of power outputs to suite your home.

Like the whole Vitodens range it comes with the Viessmann stainless steel heat exchanger. Giving you peace of mind that it will last a long time.

Our Viessmann Vitodens 100-W review will be able to tell you more about this boiler.

Combi boiler-only available from £1,425
System boiler-only available from £1,237
Regular/Heat-only boiler-only available from £1,108

Manufacturer Viessmann
Model Vitodens 100-W Condensing Gas & LPG Boiler
Condensing Yes
Efficiency Rating 94%
Modulation Range 1:10
Energy Efficiency Class A Rated
LPG Compatible Yes
Warranty Up to 12-year comprehensive warranty
Combi Models Available 26kW, 30kW & 35kW
System Models Available 11kW, 19kW, 25kW & 32kW
Regular/Heat-only Models Available 11kW, 16kW, 19kW, 25kW & 32kW
Flow Rate 10 – 14 litres/minute
Central Heating Max. Output 19-25kW
Mounting Wall Mounted
Weight 33kg
Dimensions 700mm (Height) x 400mm (Width) x 360mm (Depth)

Viessmann Vitodens 100-W Key Features:

  • Quiet operation thanks to low fan speed
  • High-quality stainless steel Inox-Radial heat exchanger
  • Environmentally-friendly MatriX cylinder burner
  • Class A-rated for energy efficiency
  • Modulation range up to 1:10
  • Low CO2 emissions
  • Backlit LCD touch screen for easy operation
  • LPG compatible without a conversion kit
  • 20% Hydrogen-blend ready
  • Remote monitoring to enhance diagnosis
  • Up to 12-year extended warranty available if installed by Boilerhut
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#4. Vaillant ecoTEC exclusive with Green iQ combi

Vaillant ecoTEX exclusive - Best Condensing Boilers | BoilerhutOne of the reasons why Vaillant and Worcester Bosch don’t usually score highly in reviews is due to the use of aluminium heat exchangers. However, the Vaillant ecoTEC exclusive with Green iQ combi is an exception to this rule. It is a Vaillant boiler that features a stainless steel heat exchanger. For this reason, it is a worthy addition to this list.

Due to the stainless steel heat exchanger, the ecoTEC exclusive with Green iQ combi will retain its efficiency for years. It also has a fantastic modulation of 1:10, which gives the boiler high efficiency. Also, Vaillant claims that 85% of its parts are recyclable.

Providing future-proof technology, the boiler is also WiFi-compatible. It can be programmed and controlled from a smartphone or tablet using Vaillant’s vSMART™ heating control.

Combi boiler-only available from £1,890
System boiler-only available from £1,814

Manufacturer Vaillant
Model ecoTEC exclusive with Green iQ
Condensing Yes
Efficiency Rating 94%
Energy Efficiency Class A Rated
LPG Compatible Yes
Warranty 10 years
Central Heating Max. Output 25.3, 24.8 or 33.7 kW
Mounting Wall Mounted
Weight 34.5, 42.5 or 50 kg
Dimensions 720 mm (Height) x 440 (Width) x 406mm (Depth)

Vaillant ecoTEC exclusive with Green iQ combi key features:

  • Quiet operation
  • Modulation range up to 1:10
  • Excellent flow rate of 17.8 litres per minute (combi only)
  • ErP A rated for both hot water and heating efficiency
  • Works with LPG
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#5. Worcester Bosch Greenstar 4000

The Worcester Bosch Greenstar 4000 is a mid-range boiler from Worcester Bosch. It is the successor to the popular Greenstar i range.

The Greenstar 4000 is a direct replacement for the Greenstar i, i Junior and Si boiler models available between 2005 and 2015. The 4000 has been kept the size the same, which enables a relatively simple switch from an older version. A bracket and minimal pipework is needed. A great idea from Worcester Bosch enabling engineers to install these boilers more quickly.

This is the only boiler on the list with an aluminium heat exchanger. This is mainly because the 4000 range is very popular and works well. But only if you really look after it correctly. It will lose efficiency over time but it has a 10-year warranty which means even if it costs you more to run each year, it will actually be running.

Combi boiler-only is available from £1,450.
System boiler-only is available from £1,360.

Manufacturer Worcester Bosch
Model Greenstar 4000
Condensing Yes
Efficiency Rating 94%
Energy Efficiency Class A Rated
LPG Compatible No
Warranty Up to a 10-year guarantee
Combi Models Available 25kW & 30kW
System Models Available 12kW, 15kW, 18kW, 21kW & 24kW
Central Heating Max. Output 24 kW
Mounting Wall Mounted
Dimensions 724mm (Height) x 400 (Width) x 310mm (Depth)

Key features

  • Available as a combi boiler and a system boiler
  • Front access to all key components for ease of installation, servicing and maintenance
  • Offers hot water flow rates of up to 12.3 l/min
  • Bosch EasyControl – allows you to control your home’s heating wherever you are via a mobile phone or tablet
  • Sleek design
  • Great reputation from the Worcester Bosch brand

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