Which is the best combi boiler to buy in 2023?
The best combi boiler to buy is very dependent on your home, therefore we’ve picked out the best based on the average home in this comprehensive guide to help you choose between the best combi boilers available.
Get 12 years warranty for the price of 10 on the best combi boilers here
The best combi boiler is energy efficient, reliable and cost-effective.
All the combi boilers in this review are A-rated for energy efficiency and come with long warranties of over 10 years so you can be sure that they are reliable; let’s look at the benefits and highlights of each to help you decide.
Get a Fixed Price >What is a combination boiler?
A combi boiler is a type of heating unit that produces hot water instantly using mains water. Combi boilers are typically powered by natural gas, and use a process called heat exchange to heat the water.
In this process, natural gas is burned to heat two heat exchangers, which transfer the heat to the cold water from the mains.
The resulting hot water is then sent to the taps or circulated through the central heating system. Combi boilers are known for their efficiency and effectiveness in providing hot water and heating for a home.
How to choose the best gas combi boiler
When choosing a combi boiler for your home, it’s important to consider that different homes may require different types of boilers. Our selection of combi boilers includes options with a range of outputs and in different styles, such as system or regular boilers.
As combi boilers may not be a familiar topic to everyone, especially in you have never bought a new boiler before, we’ve curated a list of the best combi boilers on the market from leading boiler brands.
Some of the most well-known brands in the industry include Worcester Bosch and Ideal, but there are also other high-quality brands that offer the best combination boilers for providing instant hot water.
Get a Fixed Price >Best combi boiler in 2023 – The best UK boilers this year so far
Choosing a replacement combi boiler can be overwhelming with the many options available from different boiler brands. We’ve narrowed down the selection to the top 7 best boilers, all of which are natural gas boilers.
Our selection is based on various key features that are important in combi boilers, including new boiler costs and value.
Additionally, all the boilers in our list are condensing and highly energy efficient. We have also provided information on the latest combi boiler installation costs for those considering a new boiler installation.
Get a Fixed Price >Our top 7 best combi boilers in the UK:
The best combi boiler you can buy at the moment is the Viessmann Vitodens 050-w, so we have reviewed this combi boiler and 6 other best combi boilers to help you make a decision about which is best for your home.
The following best combi boiler models are the fast-selling Worcester Bosch 4000, and then the 3rd best combi is the Worcester Bosch 2000, which is also a great combi but doesn’t come with the same amount of warranty of features as the Vitodens 050-w.
| Rank | Combi Boiler |
| 1 | Viessmann Vitodens 050 |
| 2 | Worcester Bosch Greenstar 4000 |
| 3 | Worcester Bosch Greenstar 2000 |
| 4 | Ideal logic C30 |
| 5 | Worcester Bosch 8000 |
| 6 | Viessmann Vitodens 100-w |
| 7 | Vaillant ecoTEC |
As you can see from the list of boilers there are two brands that have two boilers on our list and there’s a good reason for this, as they make some fantastic boilers which we will pick apart further in this post to find out why.
Get a Fixed Price >Why are these the best boilers to buy right now?
The main difference between these gas combi boilers is the value for money as they are super reliable and come with excellent warranties and something which is more important these days with energy prices increasing, we have taken energy efficiency into account.
You can compare prices online now and get these combi boilers installed the next day by a Gas Safe registered engineer with Easy Boilers all at a fixed price online.
Once you have answered a few questions about your home and current heating system, you will be provided with a quote for combi boilers suitable for your needs.
Comparing the best combi boilers and what we consider
Here is a list of things we consider when assessing how good a combi boiler is.
These are what we believe you should look for in all boilers before considering your replacement.
- Boiler Specifications
- Price of the combi boiler & value for money
- Most reliable combi boilers
- Length of boiler warranty
- Energy efficiency
- Online reviews
- Online reports or issues raised
- Customer service and aftercare
- Can the boiler fit in a kitchen cupboard
The best combi boilers should be the most reliable combis and score highly in all these areas and provide you with years of hassle-free heating and at a great price.
Skyrocketing energy prices can also be kept to a minimum too with these energy-efficient combi boilers.
Choosing from the best combi boiler brands
The top combi boiler brands manufacture high-quality, energy-efficient boilers that come in a variety of ranges, from entry-level to top-of-the-line models, with different outputs to suit different needs.
This allows them to reach a wider market and provide a suitable boiler for every home in the UK.
Choosing the most reliable boilers
With years of experience and knowledge, we know exactly what to look for in the best combi boiler in 2022
When assessing combi boilers, we consider factors such as sales performance and customer feedback from reputable sources like Trustpilot.
We understand that people value the experiences of others and it can heavily influence their decision-making when selecting a suitable combi boiler model.
It’s important to note that choosing the right type of central heating system for your home is even more crucial than selecting the best combi boiler available.
Why are the most efficient combi boilers best?
Choosing the best central heating boiler depends entirely on your home and hot water demand.
A too-powerful boiler is unnecessary, and a boiler that isn’t powerful enough will not warm your home’s central heating or hot water to the desired temperatures.
However, for the average home, you should expect a combi boiler with an output of 30kw would be perfect.
Most of the combi boilers in our list, such as the Viessmann Vitodens 050-W, the Worcester 2000 and the Ideal Logic, all have boilers that have an output of 30kw.
These boilers would be perfect for small to medium-sized homes’ central heating.
If you’re looking for more powerful 40kw combi boilers for larger homes, you could run up to bathrooms simultaneously.
Get a Fixed Price >Best combi boiler brands from sales in the UK
As we have picked out different gas combi boilers from certain combi boiler brands, if you are interested in what we believe are the best boiler brands to buy from you can browse their boiler range.
Here is our shortlist, as you would expect, Worcester Bosch boilers are top of our best boiler brand list of combi boiler manufacturers.
- Worcester Bosch
- Viessmann
- Ideal
- Alpha Innovations
- Vaillant
- Glow Worm
#1 Best Combi Boiler – Viessmann Vitodens 050-w
Viessmann combi boilers are some of the best boilers on the UK market, and to take the top spot off Worcester Bosch in our combi boiler review, it needed to take something special.
We believe the Viessmann Vitodens 050-w combi boiler has it all and is the best gas combi boiler available on the market in terms of unrivalled specification, being hydrogen blend ready and excellent value for money.
Why is the Viessmann Vitodens 050-W the best boiler?
In short, the amount of boiler and extras you get for the money with the Vitodens 050-W is unbeatable.
This brand new combi boiler for 2022 comes with built-in wifi and is a hydrogen ready boiler (20%), but even better when these excellent boilers fit in kitchen cupboards and also look great out on show.
Is this the most reliable combi boiler on the market?
Also, hailing from German giants Viessmann, these combi boilers are the most reliable and come with a massive 10 years warranty as standard, all for under £1,800.
With its stainless steel heat exchanger, hydrogen blend ready technology and top-quality parts, this boiler is great for hassle-free heating all year round
Get a Fixed Price >Viessmann 050 best bits and why to buy
- Superb value for money
- Fantastic spec and performance
- Great parts and labour ten years warranty
- Viessmann are the largest boiler manufacturer in Europe
- Super efficient boilers
- Stainless steel heat exchanger
- Compact and lightweight
- Great new looks
- Great reviews online from customers
- Excellent aftercare service
- Built-in Wifi
- Hydrogen-ready combi boiler
If you like the sound of this fantastic combi boiler you can get a quote online now with companies such as Easy Boilers in under 20 seconds.
#2 Best Combi Boiler – Worcester Bosch Greenstar 4000
The Worcester Bosch Greenstar 4000 combi boiler came close to being our best combi boiler, but it just got pipped on price.
The Worcester Bosch 4000 combi is over £100 more expensive than the Vitodens 050-w, and we have it on good authority that the Viessmann is the better and more reliable boiler.
The Worcester Bosch 4000 combi is slightly bigger than our winner too, so it loses out in the compact size department too.
Get a Fixed Price >Why is the Worcester 4000 the 2nd best boiler?
- Excellent spec boiler, and upgrade on the old Greenstar i
- It costs around £1,925, including installation
- Can fit exactly where the old Greenstar i did and be directly replaced
- Can fit in kitchen cupboards but is a bit bigger than others, so do check.
- One of the best-selling gas combi boilers so far this year
- comes in 2 outputs of 25kw and 30kw
- Given a Which? best buy award
- Has a Quiet Mark accreditation for low operating levels
- 10-year warranty from Worcester Bosch (12 available with Easy Boilers)
- Easy to install and replace an old combi boiler
- Hydrogen ready boiler
- Easy-to-use LCD display
- Great aftercare from Worcester Bosch who is one of the best manufacturers
This combi boiler has been a best seller since it arrived which is a great mid-range combi that will continue to be popular for years.
If you think this gas combi boiler is for you then you can get a fixed price quote for full boiler installation now in under 20 seconds with Easy Boilers and get 2 years extra free warranty worth £500.
#3 Best Combi Boiler – Worcester Bosch Greenstar 2000
If you know anything about combi boilers, then you will now be surprised to see another Worcester Bosch combi boiler near the top of our list.
For the first time ever with the Worcester Bosch 2000, they have entered the budget boiler market.
If you don’t know anything about combi boilers, then, in short, Worcester Bosch is like the Nike sportswear brand for boilers.
They churn out quality boilers year in and year out and have dominated the UK boiler market for over 10 years with their now-discontinued Greenstar i combi boiler range.
Worcester bosch boiler prices are more than fair, considering what you get.
Why is the Worcester 2000 the 3rd best boiler?
- Great spec with energy and water-saving features
- Fantastic value for money at around £1,695 with installation
- The good warranty at six years
- Great online reviews from customers
- It has been a best-selling boiler since its release in 2019
- From one of the best manufacturers
- It comes in 2 different outputs of 25kW and 30kW
- Fits in kitchen cupboards
- Quiet Mark accreditation
- Easy to install and maintain – Side panels can be removed
- Great aftercare from Worcester Bosch
- Hydrogen ready
As we have said Worcester Bosch is one of the best manufacturers in the UK.
If you think the Worcester 2000 is the boiler for you then you can get a quote on this boiler now in under 20 seconds online with Easy Boilers.
Get a Fixed Price >#4 Best gas combi boiler – Ideal Logic combi boiler
The Ideal Logic combi boiler seems to be around forever, and there’s a good reason why it has stood the test of time.
It’s a low-cost, reliable and compact combi boiler that suits most people’s homes and budgets.
The Ideal Logic is one of the most installed boilers in the UK, and Ideal gas combi boilers are the choice of new-build contractors across the UK due to their energy efficiency.
Why is the Ideal Logic our 4th best combi boiler?
- Great value for money at less than £1,800
- Very reliable boiler
- It comes with a good warranty
- Is compact, one of the best for kitchen cupboards
- Easy to install
- Quiet Mark accreditation
- One of the best-selling boilers ever
- Available in 3 different outputs 25kw, 30kw and 35kw
- Hydrogen ready
- Great aftercare
The Ideal Logic combi boiler is a perfect choice for small to medium-sized homes across the UK.
With Easy Boilers, you can price one up online in under 20 seconds.
#5 Best Combi Boiler – Worcester Bosch 8000
This combi boiler is the best combi boiler that Worcester Bosch manufacture.
The Worcester Bosch 8000 has everything, including style.
It is designed the opposite to most combi boilers and made to be on show and not hidden away and the gloss black style range is quite a thing of beauty for a boiler, anyway.
The Worcester Bosch 8000 is super powerful, reliable, and comes with a massive 12 years warranty. The only thing that stops this from topping our poll, which we are sure you can guess, is the high price tag.
Why is the Worcester 8000 our 5th best boiler?
In terms of value for what you get with the Worcester 8000 gas boiler, it is good value for money.
However, essentially, it can only heat up your hot water and radiators the same as the other combi boilers in this list, but it does come with extra power, and the 40kw 8000 combi boiler is a top seller.
At a cost of £2,400 with installation, it’s over £700 more than the Worcester 2000, which will do the same job.
On the other hand, the 8000 uses premium parts, has built-in Wifi and looks fantastic, and is backed up with a 12-year guarantee.
- Available in 6 different outputs 25kw, 30kw, 35kw, 40kw, 45kw & 50kw
- Hydrogen ready
- Excellent aftercare
- It comes in 2 different colours
The Worcester 8000 is one of the best Worcester Bosch combi boilers ever made in terms of technology. If you can afford the hefty price tag, then get a quote here online in 20 seconds with Easy Boilers.
If this combi boiler is a bit pricey, why not check out the Worcester 4000 instead?
Get a Fixed Price >#6 Best combi boiler – Viessman Vitodens 100-w
The premium combi boiler that is the bigger brother to the Vitodens 050-w makes our list, and for a good reason.
It’s a powerful, reliable combi boiler with a fantastic 10 years warranty.
As a German-engineered boiler the Vitodens 100-w is the most reliable boiler and will give you years of hassle-free heating.
One of the main things about the Vitodens 100-w is that it is in direct competition with the Worcester 8000 but is about £150 cheaper.
So if you prefer substance over style, this is perfect.
Why is the Viessmann 100 the 6th best combi boiler?
- Even with a price tag of around £2,250 with installation is still a good value
- Long warranty
- Built-in Wifi
- Hydrogen ready
- Extremely reliable
- Excellent aftercare
- Available in 3 different outputs
If you think this boiler is perfect for your home, get a fixed price online now with Easy Boilers in under 20 seconds.
#7 Best Combi Boiler – Vaillant ecoTEC
Vaillant is another well-known boiler brand that continues to push the boundaries in the search for ever more energy-efficient boilers as per the ERP directive.
Vaillant combi boilers aren’t the cheapest, but their build quality makes them an excellent choice.
Their Vaillant ecoTEC exclusive with Green IQ is one of the most energy-efficient boilers.
Why is the Vaillant ecoTEC the 7th best combi?
- Super reliable boilers
- One of the most energy-efficient boilers
- Great aftercare
- Long ten years warranties
- Very powerful combi boilers
- Available in 2 different outputs, 35kW and 43kW
- High flow rates of 17.8 litres/min
- Quiet Mark accreditation
Are you looking for one of the best boilers that Vaillant makes?
Get a great price on this Vaillant ecoTEC boiler online now with fixed quotes in under 20 seconds with Easy Boilers.
The boiler industry is highly competitive, and it is crucial for these brands to not only produce the best boilers possible but also to establish a strong brand reputation for reliability and cost-effectiveness.
Get a Fixed Price >FAQs
Which are the best boilers in the UK right now?
The best boilers in the UK are the combi boilers we have chosen, but that doesn’t always mean that the combi boiler is right for your home.
The best gas boiler for your home may be the best system boiler or one of the best regular boilers, especially if you have a larger home with a hot water tank.
Your home is what matters the most when choosing the best gas boiler suitable for your needs.
How much does a new combi boiler cost?
A new combi boiler cost between £450 and £3,000 depending on the make and model just for the boiler on its own, however, if you want your combi boiler installed, it will cost considerably more. New combi boiler costs are around £2,200 on average for a mid-range combi boiler like the Worcester 4000 for a direct combi swap.
If you want to convert from a system boiler to a combi boiler, then installation costs will be much higher. Just the same as British Gas boiler prices are much higher too, so always compare quotes.
What makes an excellent combi boiler for UK homes?
A good combi boiler should produce hot water efficiently and instantly. Energy efficiency is the key, as the more efficient it is, the lower your gas and electricity bills.
A combi boiler must run at over 90% efficiency. Some of the best combi boilers will run at over 95% efficiency.
As manufacturing processes improve and technology advances, combi boilers are becoming more efficient for longer.
Which are the best condensing combi boilers?
If you think that we might be opening a whole new kettle of fish here then you will be glad to know that we have covered the best condensing combi boilers as all the new combis have condensing technology built into them as per Boiler Plus legislation.
This FGHR or flue gas heat recovery system that they use means that any waste gasses are recirculated back through the boiler to ensure the maximum amount of gas is used up.
This is how they achieve over 90% energy efficiency.
What are the best electric combi boilers?
if you are looking for something different, then you could also consider an electric combi boiler which is stated to run at 100% efficiency. This does not however make them a better option as they cost far more to run due to the higher cost of electricity. See our best electric combi boiler guide here for more information.
Suitable combi boilers for your home depend on the size and output
Suitable combi boilers for your home depend on the size of your home and hot water demand.
If your boiler is too big for your home in size and output, you may be using more gas and electricity than necessary, making an efficient combi boiler inefficient and the same applies to suitable combi boilers for larger homes.
If your combi boiler is too small, it may have to work overly hard to keep up, costing more on your utility bills.
Get a Fixed Price >Which is the best combi boiler for a 2 bedroom home?
The best combi boiler for a 2-bedroom home is the Viessmann Vitodens 050-w 25kw combi boiler due to its compact dimensions making it the perfect gas boiler for a kitchen cupboard and great output for a small combi boiler.
The Vitodens combi range is renowned for its reliability and comes with a great 10-year manufacturer warranty, or 12 years if you buy with our recommended installation company. If you have a 2 bedroom home with 2 bathrooms we think you would be better with a 30kw combi though.
Which is the best combi boiler for a 3 bedroom home?
The best combi boiler for a 3 bedroom home is the Worcester 4000 30kw combi boiler as it is perfect for kitchen cupboards but also has a bit of extra power if your 3 bedroom home has an extra bathroom.
These are the most popular output in the Uk as they are prefect for the average home and help keep running costs down.
What is the best combi boiler for a 4 bedroom home?
The best combi boiler for a 4 bedroom home is the Viessmann Vitodens 100-w 35kw.
This is because there are usually 2 bathrooms and also extra power is required to ensure that hot water is pumped around your central heating system effectively and efficiently.
What is the best combi boiler for a large home?
The best combi boiler for a large home is the Worcester 8000 40kw combi, however, if you have a large home then a system boiler may be a better option as sometimes a combi boiler can’t keep up with hot water demand to multiple taps at once due the fact that they rely on mains water pressure.
Another option for homes with high hot water demand is the storage combi boiler which is a cross between a system boiler and a combi. Storage combi boilers are more expensive but great for space saving instead of a hot water tank.
What is the best combi boiler under £1,000?
The best combi boiler under £1000 is the Worcester 4000 combi boiler.
This new boiler was released by Worcester in 2021 and has been their best-ever boiler, which is priced in the mid-range bracket for a boiler.
The boiler quote will be over £1000 when you add the cost of a new boiler installation, but for a standalone boiler under 1k, this is perfect for many 1-4 bedroom homes.
Using our recommended installation companies, you can get all the best combi boiler deals right now.
Get a Fixed Price >Which is the most reliable combi boiler?
The best combi boiler that is the most reliable is one from the top boiler brands such as Worcester Bosch, Viessmann, and Ideal boilers. They generally come out on top as the most reliable combis year after year in most combi boiler reviews.
Best value boilers and most cost-effective?
The best value boilers tend to be mid-range boilers such as those below:
- Viessmann 050-W
- Worcester 2000
- Ideal Logic Plus C30
These are all packed with massive features but also have an attractive price tag to enable us to label these as very good value boilers. Get a good deal in our combi boiler clearance sale here
Best gas combi boilers reviews – Our conclusion
As you can see from our review, there is very little between the top combi boilers in the market. It does almost come down to personal preference or recommendation.
The Viessmann Vitodens 050-W has a much better specification for the money, but the Worcester Bosch 2000 has the boiler brand edge.
One thing you will need to take into consideration is who you get to install your new boiler.
You need to ensure they are Gas Safe registered. We recommend that you use one of our best boiler installation companies by simply clicking get a quote and answering up to 10 clickable questions, which take less than a minute with no personal information.
If you are still unsure which model you should get from each range, simply use Easy Boilers’s online quote tool and get a boiler that is perfect for your home in under 20 seconds by clicking get a quote now.
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