Best Combi Boilers – What to buy (and avoid) in 2020 -*Updated June 2020

best combi boilers

Here are the 5 most reliable and recommended boilers on the market in 2020.

Welcome to Boiler Central’s ultimate guide to the best combi boilers in 2020. Boiler Central is here to recommend the most trusted, reliable, and affordable boilers available in the UK in 2020 and beyond .

There are over 1.5 million boilers installed in the UK every year. That’s 7.5 million over 5 years. With all these installs and experience gained , we can finally answer the question what are the best boilers on the market?

Well let’s take a look at the best boilers in 2020 and save you some time and money:

Best Combi Boilers in 2020 are:

  1. Veissmann Vitodens 050-W Combi
  2. Ideal Logic+ Combi
  3. Vokera Easi Heat C
  4. Worcester Bosch Greenstar CDi Combi
  5. Baxi 600 Combi

Best System Boilers in 2020 are:

  1. Viessmann Vitodens 100-W System
  2. Worcester Bosch Greenstar i System
  3. Vaillant ecoTEC Plus System
  4. Vokera Easi-Heat Plus System
  5. Ideal Vogue Max System Boiler

Where can you buy these boilers? Click here

recommended boilers UK

What’s the average cost of a boiler?

The cost of a new boiler is on average £1,800 and only the ones with fancy new smart meters built in are tipping the £3,000 mark.

Boilers are however, the heart of your home, so picking the best is super important.

New boilers in 2020 are far more efficient and reliable than even 5 years ago. Many are warrantied and guaranteed to last 15 to 20 years!

So when you’re buying your new boiler , make sure you choose the right one (we’re here to help with that) so you can keep warm year in, year out.

This guide gives you the top picks in 2020.

So you’re in the market for a new boiler. But before we tell you the recommended and best boilers, let’s first break down some interesting stats and quick summaries for you..

Is a new boiler worth it?

Well quite simply, from an Eco-friendly and ‘green’ standpoint, absolutely.

From a money-saving point, definitely!


Because new boilers are the most efficient they have ever been.

According to The Energy Saving Trust, you can save up to £340 a year on your energy bills. That’s welcome money in anyone’s pocket.

Let’s first provide a quick summary of the best boilers to buy this year:

Be sure to read more further down to get a real review on why they are the most recommended boilers on the market in 2020.

We’re here to inform you of the best combi and system boilers that are available to buy in the UK in 2020.

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.

You can price up and buy Viessmann boilers in just 20 seconds, by clicking here.

The best boilers – Our verdict

Our aim for this guide is to give you an idea of the best boilers on the market for this year .

We also want to show available options from boiler manufacturers and the types of boilers for 2020.

If you have a boiler that has lasted you several years, it’s always a good idea to think about getting a replacement boiler before anything happens. Plus, the savings on your heating and hot water bills will account for the new boiler cost in a few years.

New Boiler install 2020

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 boiler ensures that you have one that is efficient, durable, and 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 anyone doing 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 2020 but the wide range of choices can make the decision difficult.

Best boiler manufacturers

We’re here to help you out. So, let’s take a look at everything you need to know in order to upgrade your current boiler from the leading brands such as:

best veissmann combi boilers
best ideal boilers
best vaillant combi boilers
best baxi combi boiler
atag boilers
best worcester bosch boilers
recommended boilers to buy

Let’s take a look at combi, system and regular boilers individually in more detail:

Which are the best combi Boilers on the market in 2020?

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

These types of 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 up 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.

Is a Combi Boiler Big Enough for my Famly Home?

All of the best boilers on the market have a range of different sizes available to meet the needs of any household.

So, whether your house is a larger home with multiple bathrooms or just the one, you can find the perfect one for you.

Most Reliable Combi Boilers in 2020 – Our Top Picks

To make things easier, we’re going to be listing down some of the best new combi boilers in 2020. The following are our top 5 boilers picks in terms of value, performance and efficiency.

1. Viessmann Vitodens – Best Value

veissmann boilers

Viessman is already taking the market by storm because of their economical heating systems that are efficient and offer exceptional value for money.

The Veissmann 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 cleanse – completely free.
  • Available in different kW outputs ranging from 50-W to 200-W

2. ATAG iC Economiser Plus – Most Efficient

atag boilers

ATAG’s boilers are swiftly being ranked among the best rated combi boilers in 2020 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

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

4. Worcester Bosch Greenstar CDi Classic – Well known brand

worcester bosch boilers

Worcester Bosch has been hailed as market leader and for good reason. They have consistently produced quality products which is why they definitely rank among the best combi boilers in 2020. 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

The 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

5. Ideal Logic – Best Small Boilers

ideal boilers

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 2020, 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

These are the top picks for the best combi boilers in 2019 and 2020. 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 2020 by metrics of performance, price, warranty, easy of installation, and maintenance.

You might have seen most 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.

recommended boilers to buy



These are the best system boilers to buy in 2020:

best system boilers

System boilers are great for homes with a larger output of hot water, such as homes with 3+ bedrooms.

This type of boiler has the water supply from the mains and supplied via a large tank or cylinder so they have water  available on demand.

On the other hand, because they store water in a cylinder, (which needs alot of energy) they will sometimes leave you waiting for it to refill before you can access hot water.

A system boiler also requires the hot water tank to be stored somewhere in the household, so it takes up more space.

They are more expensive than combi boilers to buy initially however they have a better reliability. Combi boilers are also cheaper to install. 


Make sure your boiler has a stainless steel heat exchanger! Why? let’s discuss….

stainless heat exchanger

Boilers demand the most energy efficient and reliable components. A key component in choosing the right system is the heat exchanger within the boiler.

Heat exchangers are one of the most likely failure concerns in most boilers. 

This is because maintenance costs, durability and product lifetime should all be considered when buying a boiler.

Stainless steal exchangers provide a high resistance to corrosion and increase the life of your boiler.

Due to these key factors this provides long term value for money and requires less downtime in your house hold due to boiler maintenance.

They are also self cleaning and no not require inhibitors for the water to be able to drink.

Our recommendation is the Viessmann boilers range as they feature stainless steel heat exchangers.

Get your Viessmann boiler price online in 30 seconds here.


Which Combi Boiler is Best in 2020 for you?

When you are taking a look at our top picks for the best range of combi boilers in 2020 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 is 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 2019 and 2020 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 2020.

recommended boilers to buy



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 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 2020What is the most efficient combi boiler on the market?

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.


What is the best budget combi boiler?

The best budget combi boiler is the Vokera EasiHeat boiler. Price one up – Click here

What is the best central heating boiler?

best boilers 2020

The best central heating boilers available in 2020 are:

  1. Viessmann Vitodens 100-W 35kW
  2. Vokera EasiHeat 32kW
  3. Worcester Bosch Greenstar 30kW

These come in combi or system variations dependent on the type of home that they are being installed in.

Our 2020 boiler recommendations from manufacturers with fantastic reviews and the best reliability ratings.

Some say that Viessmann are the top boilers on the market today. They are German made which gives the build quality that edge and respectability.

Worcester Bosch however have been the UK market leader for many years so Viessmann have a job on to knock them off top spot and they’re getting there in leaps and bounds with their 2020 boiler range..

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

boiler  types best boilers 2020

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.

If you are unsure what boiler size and type is best for your home then take our 10 step boiler fixed cost quote calcualtor.

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.

recommended boilers to buy

Get a great price on a Which? Best Buy new boiler in minutes

Pick your install date | £0 Deposits | Pay Over 10 Years
Get a new boiler on finance with nothing (£0 deposit) to pay today 🤗Get this offer