Which is the best combi boiler for 2021?

Best combi boiler

Best combi boiler 2021 – The best combi boilers right now.

The best combi boiler in 2021 is what everyone wants for their home right?

Ensuring your home has the best combi boiler on the market to keep you warm all-year-round is important for your warmth and happiness.

Our best boilers list is here to provide you with the top 5 combi boilers you can buy right now, recommended by us.

If you have a manufacturer in mind, you can find our top pick from their range of new combi boiler options. boiler brands

If the boilers in our best combi boiler list are not enough, then we have a list of the best boiler manufacturers below, in order of rating:

5 Best Combi Boilers for 2021:

#1: Worcester Bosch Greenstar 2000

#2: Ideal Logic+C30 Combi

#3: Viessmann Vitodens 100-W Combi

#4: Viessmann Vitodens 050-W

#5: Vokera EasiHeat Combi


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Top 7 Best Boiler Manufacturers

#1. Worcester Bosch
#2. Ideal
#3. Viessmann
#4. Vokera
#5. Baxi
#6. Vaillant
#7. Alpha

With the first half of 2021 having a significant overhaul in our list of the recommended boilers, with the Baxi 600 and Vokera Easiheat making the top 5. The list could change before the end of the year.

Some excellent new combi boilers are coming out as well as rumours that Viessmann is looking to compete with Worcester’s new 2000 boiler.

Getting a new boiler is not all about how much it will set you back and the highest spec boilers so our handy list of the top combi boilers that are available on the market right now, giving you our feedback with no confusing jargon.

We test each of the boilers rigorously with our extensive review process, ensuring that we check everything from the energy usage to the output and flow rate.

Most importantly, considering how reliable they are, design, ease of use and if they will last a long time.

We will then take into account the costs associated with each boiler. Not everyone prefers an all singing and dancing combi boiler, so we have something for everyone’s budget in our ranking decisions.

So the best part is yet to come – Our best combi boiler list has never been as competitive, meaning consumers have the pick of boilers and all of the top 5 could be perfect for your home.

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How do we pick the best boilers?

Easy – We install thousands of boilers each year, so we really do get to find out what our customers love and hate.

Not only that, but we know how reliable boilers are and due to us selling the full market range of boilers we sell all brands, not just certain ones.

To find out the best boilers we take into account:

  • Customer surveys- customer reviews
  • Boiler specifications – main boiler reviews
  • Warranty length – manufacturers trust of how long a boiler will last
  • Issues raised will are logged weekly
  • Price – best buy boilers
  • Aftercare from the manufacturer
  • Manufacturer online reviews

All of the above areas are the main factors that we take into account when picking the best new gas combi boilers on the market.

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Reviews of the best boilers in 2021.

So you’re on the market for a replacement boiler?

But before we tell you how we get to our conclusions on the recommended and best boilers, let us first break down some interesting stats and quick summaries for you.

Best Central Heating Boiler

We have all heared of Which? right?

Which? is the leading consumer powerhouse that tries, tests and reviews a whole range of products and services available on the market.

They then come up with the top picks and tell us all what is the best domestic boiler to buy.

New Boiler costs (which logo)

Which? Also feature central heating boilers and provide their Best Buy options, of which (excuse the pun), the Viessmann 050 combi boiler is the best buy boiler they have chosen for 2021.

So, with both Boiler Central and Which? claiming the 050-W is the boiler to buy this year then, why not get a fixed price on this exact boiler now?

Click here to get an online price in 20 seconds on the Viessmann 050 combi boiler.

Summary of the best new combi boiler to buy this year:

Be sure to read further down to get a real review on why they are the most recommended combi boiler manufacturers on the market in 2021.

We’re here to inform you of the best combi and system boilers that are available to buy in the UK in 2021.

After extensive research and looking at thousands of online reviews, we have put together a rigorous benchmark system to find the best available heating and hot water boiler systems on the market today.

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The best combi boilers – Our verdict

Our aim for this guide is to give you an idea of the best boilers on the market for this year so that you can make a decision based on facts.

We also want to show available options from boiler manufacturers and the types of boilers on the market in 2021.

Again, if your boiler is getting old, say 8 to 10 years old, and gas bills are starting to creep up then you may want to consider upgrading.

Getting the best gas combi boiler ensures that you have one that is efficient and durable. It keeps your central heating system ticking over at the perfect temperature with hot water available as and when you need it.

With huge competition in the boiler market, you need to make sure you take your time in order to get the best deal you can on your new boiler.

If you think your boiler is on its way out, then you should definitely start doing your homework just in case, and that’s probably why you’re reading this article!

As much as you don’t want anything to happen, it can be quite reassuring that if you do need a boiler quickly, some installation companies can install a brand new boiler the next day, such as Boiler Central.

We haven’t heard of any other company doing the same-day installation, but it is entirely possible these days, especially with the competition between installers!

Naturally, you want to find the best boiler in 2021, but the wide range of choices can make the decision difficult.

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Which are the best combi boilers on the market in 2021?

You’ll see plenty of combi boilers in the UK market, but if you don’t know what or who the boiler companies are, you might dismiss them.

A combi boiler is a combination boiler which works your indoor central heating system and hot water in one whole unit without the need for a cylinder to store hot water.

Combi boilers are super compact, so they can easily be stored in a kitchen cupboard.

This means that you’re able to kill two birds with one stone here. Combi boilers also have a high energy efficiency rating of 98% when it comes to heating water.

How does this benefit you?

By saving more money on energy bills and having hot water as and when you need it. Oh, and a toasty warm house!

All this by just getting a brand new energy-efficient combi boiler installed in your home.

For boiler information or a quote – click here

Most Reliable Combi Boilers

To make things easier, we’re going to be listing down some of the best new combi boilers in 2021 of which are the most reliable combi boilers.

The following are our top 5 boilers picks in terms of reliability, value, performance and efficiency.

1. Viessmann Vitodens – Huge value

veissmann boilers

Viessmann is already taking the market by storm because of its economic heating systems that are efficient and offer exceptional value for money.

The Viessmann brand is regarded as one of the best because it offers fantastic performance along with unrivalled reliability in the Viessmann Vitodens range.

The Vitodens combi boiler range has the following features which make it a favourite:

best combi boilers

  • Gas-based combi boiler – comes with a flue kit
  • Has Which? Best Buy boiler recommendation
  • 10-year product warranty
  • Wireless heating controls
  • Adey Sense filter – completely free
  • System cleanses – completely free.
  • Available in different kW outputs ranging from 50-W to 200-W

Get a fixed quote in 20 seconds on a Viessmann boiler: Click here

2. ATAG iC Economiser Plus – Most Efficient

atag boilers

ATAG’s boilers are swiftly being ranked among the best-rated combi boilers in 2021 because they are exceptionally brilliant at what they do.

Small and compact in size, this brand’s boilers are earning it recognition.

The following are just some of the quality features that the ATAG iC Economiser Plus has:

  • Built-in flue gas kit – passive function best Atag combi boiler
  • 10-year product warranty
  • Lifetime replacement guarantee on iCon heat exchanger
  • Has an ErP rating of A
  • Has a weather compensator
  • Very user-friendly

Get a fixed quote in 20 seconds on a ATAG boiler: Click here

3. Vaillant ecoTEC Plus Combi – 5 star rated

vaillant boilers

Valiant’s combi boilers are another one of our award winners for the category of Best Buy.

They’re made according to high industry standards and are able to deliver stellar results. The boilers are known to give premium contenders a run for their money. Getting a Valiant ecoTEC Plus Combi boiler will give you the following features:

best vaillant combi boiler

  • Comes with an app – the vSMART app
  • 5-year warranty – can be upgraded to 7 or 10 years as needed.
  • Available in 4 different kW outputs from 25kW to 38kW
  • Has an ErP rating of A
  • Capable of heating water within 5 seconds

Get a fixed quote in 20 seconds on a Vaillant boiler: Click here

4. Worcester Bosch Greenstar CDi Classic – Well known brand

worcester bosch boilers

Worcester Bosch has been hailed as the market leader and for a good reason, they have produced some of the best new combi boiler options for years.

They have consistently produced the best boilers in the UK, and quality products which is why they definitely rank among the best combi boiler manufacturer in 2021.

They have won the Which? Best combi boiler award for a few of their boilers, giving you more reasons to purchase a Worcester.

So let’s look at one of their best:

best worcester bosch combi boiler

Greenstar CDI is a great choice… The Greenstar CDi Classic is one of their best offerings because it offers the following amazing functionality:

  • Reduced usage and wastage of electricity
  • Has Which? best combi boiler recommendation
  • Protection against frost – if fixed outdoors
  • Filling link – keyless
  • Simple controls for users
  • Instant hot water

Get a fixed quote in 20 seconds on a Worcester boiler: Click here

5. Ideal Logic – Best Small Boiler

ideal boilers

The ideal is another brand that is trusted for the quality of their boilers and judged on their affordability. If you are searching for the best boilers in 2021, you should look at the collection they have available.

best ideal combi boiler

When you get the Logic combi boiler, you will enjoy the following features:

  • Compact in size, extremely easy to use
  • Winner of Good House Keeping awards – 2013 and 2017
  • 2-year warranty – can be extended to 5 years

Get a fixed quote in 20 seconds on a Ideal boiler: Click here

These are the top picks for the best combi boilers in 2019 and 2021. The list is also by no means a complete collection of all the boilers you can find in the market, but they’re the best in our eyes.

Again, we have judged the above best combi boilers for 2021 by metrics of performance, price, warranty, easy installation, and maintenance.

You might have seen most of these brand names in 2018 and 2017 too, but that’s because these brands are renowned for consistently crafting amazing boilers and combi boilers.

Buying a boiler from any of the brands listed above also ensures that even if you don’t pick the models recommended here, you can still walk away with a boiler that will work efficiently and diligently for years to come.

For boiler information or a quote – click here

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Which Combi Boiler is Best in 2021 for you?

When you are taking a look at our top picks for the best range of combi boilers in 2021, always make sure to consider how they will perform in your household.

Picking a new boiler that others recommend without considering their performance can be a recipe for disaster.

Instead, make sure that you pay attention to various factors, including the ones outlined below:

  • Where is the boiler going to be placed? (Indoors or outdoors)
  • How big are the house and what size boiler should you get for your home? – Larger houses will benefit from boilers that have larger kW capacity
  • What is the water consumption of the house? – If every family member loves a hot bath, make sure you pick a highly efficient boiler that can accommodate this.

By focusing on these major areas, you will be able to find the answer to which boiler manufacturer is best in 2020 and 2021 for you.

You can buy a new boiler online in minutes and even apply for boiler finance with an instant online decision.

What are the recommended best buy boilers available in the UK?

We have covered which combi and system boilers top the rankings, but are these the most suitable to heat homes in the UK? A quick answer is yes!

The UK has average temperatures which do not often even in the deepest of winters fall below minus 10 degrees; therefore, the power required is not as much as a country that has much lower temperatures.

When it comes to boiler testing and best boiler recommendations, Which? are the best known for reviewing many consumer products and boiler reviews are high on their list? 

They showcase the leading Best Buy boilers on the market each year and feature rigorous testing to come up with a final Best Buy boiler in 2021.

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What boilers do Which? Recommend as their Best Buy?

As briefly mentioned above, Which? Best Buy combi boilers and Best Buy system boilers are reviewed each year.

Viessmann and Worcester Bosch seem to frequently top the top picks for boilers recently with their leading combi boilers.

Some say that these are the best boilers on the market at the current time and in terms of customer reviews, boiler engineer recommendations, and professional testing, they all tend to agree.

Most of the Which? Recommended boilers are from boiler manufacturers with high 5 star ratings on review sites such as Trustpilot.



Frequently Asked Questions


What is the best combi boiler for a 4 bedroom house?

The best combi boiler for a 4 bedroom house is the Viessmann 050-W 35kW combi boiler.

The best system boiler for a 4 bedroom house is the Viessmann 100-W 30kW system boiler.

best combi boiler 2020Most efficient combi boilers

The most efficient combi boiler for a 4 bedroom house is the Viessmann 050-W 29kW combi boiler.

The most efficient system boiler for a 4 bedroom house is the Viessmann 100-W 26kW system boiler.


Best budget combi boilers

The best budget combi boiler is the Vokera EasiHeat boiler.

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Combi Boiler vs System Boiler – Which One is Best for Your UK Home?

This completely depends on the type and size of home that the boiler is to be installed.

We would recommend a combi boiler for homes that have 1-2 bathrooms or showers; however, if a home has multiple bathrooms and showers, then a system boiler is a better solution to provide enough hot water. 

System boilers actually store hot water in a cylinder,  making more available when and if you need it.

Combi boilers, on the other hand, heat hot water on demand which means if there are 3-4 showers running at the same time in a home, then your combi will struggle to meet the demand.

Which is the best combi boiler

If you are unsure what boiler size and type are best for your home then take our 9 step boiler fixed cost quote calculator.

This will find you the right boiler for your home, at the perfect size and performance and even a fixed price that you can purchase online by card or get an instant finance decision.

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