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Last updated: 28 November 2024

Best Combi Boilers in the UK (2024): Reviews & Buying Guide

Which is the best combi boiler?
  • The Viessmann Vitodens combi boiler is the best combi boiler overall.
  • The Ideal Vogue Max is the most reliable combi boiler, with up to 12 years warranty.
  • The average cost for the best combi boilers ranges from £1,200 to £3,000.

Combi boilers are space-saving options for heating your home and are considered to be some of the best boilers in the UK. Combination boilers consist of a single compact unit capable of running your radiators and providing your home with hot water. These boilers come in models suitable for most homes, boast high-efficiency levels and often have smart capabilities.

If you are looking for a new combi boiler, but are unsure of what makes the best combi boilers, or how to choose the best fit for your home, you’re in the right place! We’ve scoured the markets, compared combi boiler reviews and consulted our in-house experts to bring you a complete overview of the best combination boilers.

In this article, we’ll look at each boiler model for price, manufacturer reputation and longevity to give you all the information you need to choose the perfect boiler.

If you’re ready to get going with a new combi boiler installation, we can help you today. By completing our quick form, we can connect you with up to 3 local installers from our trusted network of professionals. They can offer you advice and tailor-made quotes for you to compare. It’s completely free with no obligation, and you could find a fantastic price.

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Choosing the best combi boilers: Our methodology

To properly assess the boilers we mention, we checked professional reviews, feedback from consumers, and awards and accolades the company or their products have received. By comparing these points, from combi boiler reviews from customers and installers, researching award-winning brands and making a market price comparison, we believe we’ve found some of the top-rated boilers available to install today.

When looking at reviews, you first need to consider the output power and the efficiency of the system, as these will have the biggest impact on your home’s heating and hot water supply. Other factors to consider include the brand reputation, the fuel it uses, the warranty, and the price.

If this all seems overwhelming, don’t worry! We’ve squashed all these categories into easy-to-follow guides below so you can find just what you need.

How did we choose the best combi boiler?

How to choose the right boiler

We know how frustrating it can be to find the answers you want quickly and simply, that’s why we’ve taken the time to find the best combi boiler for different circumstances. No two homes are the same, and your demands for hot water and heating are important.

To find the best combi boilers, we looked at a range of categories and compared boiler models on offer from some of the best-recognised brands on the market. We wanted to find out which brand offered the best for customers, as well as the reputation of each model.

To further narrow down our search, we looked at the following criteria:

  • Brand reputation: It’s good to understand a brand’s reputation and discover how other customers rate them or if they’ve won any awards for their products. Highly regarded brands may be more expensive, but you know you will get a reliable boiler that is less likely to run into issues.
  • Fuel type: It’s worth considering the performance and reliability of different fuel-type models. One major reason for this is to assess each product's environmental impact and efficiency. You might find that you want to make a fuel switch, from gas to electric, for example. Knowing your options gives you greater choice.
  • Output size: Getting the correct boiler output (or size) affects two things. Firstly, how powerful your boiler is - meaning how much heat it can produce. If you have a small home, you won’t need the same power as a larger property. Secondly, if you opt for an output that is too high, you can end up wasting fuel and spending more on energy than you need to. Combi boilers have 2 output sizes, one for central heating (CH) and one for domestic hot water (DHW). We’ve included various output sizes on our list.
  • Efficiency: The efficiency level of a combi boiler tells you how much fuel the boiler can turn into usable heat and how much fuel is wasted in the process. It is the key to understanding your environmental impact (and lowering your heating bills!). Any model that can offer above 90% efficiency is considered highly efficient, this is also indicated by an ‘A’ rating on the ErP scale.
  • Warranty: Having a lengthy warranty or guarantee period is highly beneficial. The longer the warranty period, the more reliable you can expect your combi boiler to be, as this indicates a manufacturer's commitment to the product’s performance.
  • Price: Our final point is understandably high on everyone’s list. Looking for a boiler that falls within your desired price range is important. The good news is, because there are so many combi boiler models available, there are more affordable combi models now than ever before. We’ve covered most cost ranges throughout this guide, giving you plenty of options to choose from.

What is the best combi boiler?

The Viessmann Vitodens combi boiler is the best combi boiler from our assessment of multiple brands. With a wide range of outputs, a generous warranty, and high efficiency (98%), it offers a well-balanced heating experience for the average home at a low price (miniumum £1,200).

Along with the Vitodens, our research has found the following boilers to be the best in each of these areas:

  • Viessmann Vitodens 100-W - Best combi boiler overall for reliability, warranty, and reputation
  • Worcester Bosch Greenstar 8000 Style - Highest high water demand
  • Baxi 600 - Lowest gas combi boiler cost
  • Vaillant ecoTec Plus - Most suitable to all house sizes
  • Ideal Heating Vogue Max - Best warranty
  • Electric Heating Company (EHC) Mercury - Best electric combi
Best combi boilers in 2024
Model Output sizes (CH) Efficiency Warranty Price range
Viessmann Vitodens 19kW, 25kW, 32kW 92% 10-year standard, up to 12 years £1,292 – £2,000
Worcester Bosch Greenstar 8000 Style 30kW, 35kW 94% Up to 12 years £1,600 – £1,920
Baxi Platinum Compact 21.2kW, 26.4kW 92% 10 years £1,300 - £1,700
Vaillant ecoTec Plus 21.2kW, 26.5kW, 32.2kW 94% Up to 10 years £1,500 - £2,100
Ideal Heating Vogue Max 18kW, 26kW, 32kW 93% Up to 12 years £1,359 - £1,500
Electric Heating Company (EHC) Mercury 12 - 26kW 100% (electric) 3 years £1,429 - £1,703

Each model has something unique to offer, so to help you make a decision we’ve broken down their key features and costs in the following sections in more detail.

Best combi boiler manufacturers

To help you find the best combi boilers, we’ve listed the top 5 boiler manufacturers in the UK market:

These brands have been in the boiler production business for decades and frequently appear at the top of rating polls. Aside from their reliability, customer service reviews, great warranties, and excellence awards, these brands are internationally recognised and widely available in the UK.

Let’s look some of the main contenders for the best combi boilers in the UK.

Best Worcester Bosch combi boiler

Greenstar 8000 Style combi

Worcester Bosch Best Combi Boiler
  • Available CH output: 30kW, 35kW
  • Available DHW output: 30kW, 35kW, 40kW, 45kW, 55kW, 50kW
  • Suitable for: Smaller homes with 1 bathroom or larger properties with up to 20 radiators and 2+ bathrooms
  • Efficiency: 94% and ErP A-rated for heat and hot water
  • Available fuels: Gas, LPG, 20% hydrogen blend ready
  • Warranty: Up to 12 years when installed by a Worcester Accredited Installer

Estimated price (Exc. installation): £1,600 – £1,920

Best Baxi combi boiler

Baxi Best Combi Boiler

Baxi Platinum Compact combi

  • Available CH output: 21.2kW, 26.4kW
  • Available DHW output: 25kW, 30kW, 36kW
  • Suitable for: Homes with up to 12 radiators and 2 bathrooms
  • Efficiency: 92% and ErP A-rated for heat and hot water
  • Available fuels: Gas
  • Warranty: 10-year parts and labour warranty

Estimated price (Exc. installation): £1,300 - £1,700

Best Vaillant combi boiler

Vaillant Best Combi Boiler

ecoTEC plus combi

  • Available CH output: 21.2kW, 26.5kW, 32.2kW
  • Available DHW output: 26kW, 32kW, 36kW, 40kW
  • Suitable for: Medium-large properties with 10 - 20 radiators
  • Efficiency: 94% and ErP A-rated for heat and hot water
  • Available fuels: Gas, LPG, 20% hydrogen ready
  • Warranty: Guarantee up to 10 years available when you book a Vaillant Advance installer

Estimated price (Exc. installation): £1,500 - £2,100

Best Ideal combi boiler

Ideal Heating Best Combi Boiler

Vogue Max combi boiler

  • Available CH output: 18kW, 26kW, 32kW
  • Available DHW output: 26kW, 32kW, 40kW
  • Suitable for: Homes with around 10 radiators and 1 bathroom to homes with 2 bathrooms and around 15 radiators
  • Efficiency: 93% and ErP A-rated for heat and hot water
  • Available fuels: Gas, LPG
  • Warranty: 10-year warranty, increased to 12 years if installed and serviced by a Max accredited installer

Estimated price (Exc. installation): £1,359 - £1,500

Best Viessmann combi boiler

Viessmann Best Combi Boiler

Vitodens 100-W combi boiler

  • Available CH output: 19kW, 25kW, 32kW
  • Available DHW output: 27.3kW, 31.7kW, 34.9kW
  • Suitable for: Medium-sized homes with 10 - 20 radiators and 2 bathrooms
  • Efficiency: Up to 92% and ErP A-rated for heat and hot water
  • Available fuels: Gas, LPG, 20% Hydrogen ready
  • Warranty: 10-year standard warranty, up to 12 years option when registered through the Viessmann Installer Portal

Estimated price (Exc. installation): £1,292 – £2,000

What is the best combi boiler fuel?

Gas boilers are the most popular choice among UK homeowners. Figures show that approximately 81% of homes in England, Scotland, and Wales are connected to the gas network, with the vast majority using gas boilers. As combis are the most common type of boiler across the country, it’s no surprise that there are many gas combi boiler options around.

For homes not connected to the grid, oil or liquefied petroleum gas (LPG) are the most common options for fueling their boilers. Electric boilers are another great alternative, with better environmental benefits if paired with a renewable energy source. They are, however, usually more expensive to run due to higher electricity prices.

Best gas combi boiler

Best Combi Boiler Gas Fuel

Gas combi boilers run on natural gas sent to homes via the national gas grid. Even though natural gas is produced from fossil fuels, it is considered cleaner than oil and coal.

Although they release CO2 into the atmosphere, modern gas combi boilers have inbuilt condensing technology, which reduces waste gas by recycling unused heat back into the system. Condensing boiler efficiency is very high, which can help you keep your energy bills low and reduce your carbon footprint.

The best gas combi boiler that we’ve found is the Viessmann Vitodens 100-W. This is because it has a good balance of efficiency, a long warranty, versatility, and power output.

Best oil combi boiler

Best Combi Boiler Oil Fuel

Oil combi boilers are a cost-effective alternative for homes not connected to the gas grid. However, you will need to store the fuel in an external tank. This makes them less space-saving than gas and electric combis.

The best oil combi boilers available on the market also have inbuilt condensing technology. One model we would recommend is the Worcester Bosch Heatslave II, not only for its award-winning manufacturers, but it’s also up to 91% efficiency and comes in both internal and external models to help you save space.

Best LPG combi boiler

Best Combi Boiler LPG Fuel

LPG is a combined product of natural gas and oil extractions. The best gas combi boilers are usually compatible with LPG. This makes them suitable for properties connected to the grid, as well as for the disconnected ones.

The best LPG combi boiler is also a Viessmann model, with their Vitodens 200-W LPG combi. This boiler also offers up to 98% efficiency on LPG and great control options. It’s also amongst the quietest LPG combi boilers available.

Best electric combi boiler

Best Combi Boiler Electric Fuel

Electric combi boilers don’t waste energy or release CO2 when working. However, they can only achieve zero emissions when the electricity powering them comes from renewable sources, such as solar panels.

The best electric combi boilers don’t waste energy at all, as they boast efficiencies of up to 100% but these boilers may not necessarily save more than gas boilers (especially in regions where electricity is more expensive per kWh). One model we highly rate is the EHC Mercury combi, it’s up to 100% efficient, can heat central and underfloor heating and comes in outputs suitable for small to medium-sized homes.

It’s worth remembering, however, that unless you run an electric boiler on a free, renewable source (like domestic solar panels), they can be expensive to run given fluctuating electricity prices.

From an environmental perspective, we can draw some conclusions on the impact of each type of combi boiler based on the fuel they use.

Emission Intensity by Fuel
(kilograms of CO2 equivalent per kWh)
FuelEngland, Scotland and WalesNorthern Ireland
Gas0.2130.213
Oil0.2980.240
LPG0.2400.240
Electricity*0.2250.234
* Generated using fossil fuels and distributed through the national grid.
Source: Fuel prices and carbon factors, Energy Saving Trust (April 2024)

At GreenMatch, we are committed to helping you navigate the transition to more sustainable ways of heating your home. Looking at the table above, we suggest switching to low-carbon systems such as solar panels in the UK, heat pumps, or biomass boilers. However, we understand these are still rather expensive alternatives.

If you are not ready yet to switch because of either technical or financing reasons, consider installing a highly efficient gas combi boiler. You can get the same home comforts, whilst reducing your environmental impact and still save money. To make further savings, it is worth comparing multiple quotes to find the best deal and avoid overpaying!

But how do you find qualified installers? Avoid hours of stress spent scouring the web for deals and recommendations. Instead let GreenMatch connect you with up to 3 trusted, local installers who can give you the best advice for your home.

Click the button below to get your free, non-binding quotes today!

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Most reliable combi boilers

When looking for a combi boiler, your first indication of quality will be to check the length of the manufacturer's warranty or guarantee. We always recommend this because the more time a brand is willing to protect their product for free, the more likely it is to last! (why else would they be so generous?)

That’s not all you want to look out for, though. You can also check customer reviews to see how well these products perform over time and look for special selling points, such as ‘stainless steel heat exchangers’. It might not seem like much, but opting for stainless steel can mean a long-lasting, higher-performing boiler.

We’ve listed some of our picks for the best combination boilers you can rely on for years.

Worcester Bosch Greenstar 8000 Style gas combi boiler

Boiler Worcester Bosch Greenstar 8000 Style Combi

If you do some shopping around for the best combi boiler on the market, it won’t take long before you run into a Worcester Bosch - and with good reason!

This boiler brand has a great reputation for long-lasting, award-winning products. We’ve opted for the Greenstar 8000 Style combi here because of its fantastic features. With its large output range, this model would be the best combi boiler for a 3 bed house.

It comes with a warranty of up to 12 years, an efficiency rate of 94% and a range of outputs to suit both small and large homes - meaning it ticks a lot of boxes. Not only can you count on it for at least 12 years without the worry of any breakdown costs, but it’ll also save you money with its high efficiency and optimal size range. Plus - it looks pretty stylish!

Customers give Worcester Bosch a generous 4.6 out of 5 on Trustpilot, rating them ‘Excellent’ for over 40,000 reviews. Reviews range from excellent customer service to quick, quiet, efficient boiler models.

Ideal Vogue Max combi boiler

Boiler Ideal Vogue Max Combi Boiler

Another top contender if you’re looking for the most reliable combi boiler is the Vogue Max from Ideal Heating. This sleek model boasts the all-important stainless steel heat exchanger, which ensures high corrosion resistance and flawless performance throughout its lifetime.

In addition, Ideal offers a 10 to 12-year warranty for added reliability and security. Ideal prides itself on using premium materials and includes details to ensure your boiler lasts. For example, the Vogue Max also includes frost protection and the Ideal system filter to protect your heating from day 1.

With a high efficiency of 93% and smart compatibility, you can easily control this boiler to help optimise your heating, reduce energy waste and save money on bills.

Customers give Ideal Heating 4.8 out of 5 on Trustpilot, an ‘Excellent’ rating from over 40,000 reviews. Customers commented on the excellent service and helpfulness of their engineers, and how quick these models are to fit and fix.

Viessmann Vitodens 100-W combi boiler

Boiler Viessmann Vitodens 100 W Combi Boiler

Viessmann is another highly acclaimed brand, with a well-earned reputation for long-lasting boilers. The Vitodens 100-W combi boiler comes with a 10 - 12 year guarantee option, a stainless steel heat exchanger and a highly efficient, low pollutant burner (the MatriX Plus). The Vitodens also won the 2019 Design Plus Award for it’s fantastic features.

With a range of output sizes, this boiler can serve homes with as few as 10 or as many as 20 radiators, and up to 2 bathrooms. Also, its 200-W sibling is considered to be the best combi boiler for a 4 bedroom house. With its A-rated efficiency, it will also waste less fuel and save on energy bills. It also comes in as one of the best compact combi boilers, great for saving space.

Customers rated Viessmann UK a 4.2 on Trustpilot, with just over 7,000 reviews (although the company does span many countries). Comments mention how these boilers surpass expectations, heat water super quickly and have a sleek design.

Best affordable combi boiler

So far, we’ve looked at some premium boiler brands that offer some of the best combi boiler options on the market. With this high reputation, however, often comes a higher price tag and for many homeowners, that’s just not going to work. So, what are the best combi boilers for those on a budget?

Keeping in mind some of the key criteria that make a boiler great, we’ve found 3 combi boilers that can offer high performance and efficiency, but come in at the lower end of the price range. Generally speaking, looking for a boiler under £1,000 will limit your choices, and may be particularly difficult if you have a larger home which needs a more powerful boiler.

Consulting multiple prices

Always double-check the prices you find online for boilers as some will include, or exclude, VAT and/or installation costs. Installation can add up to £2,000 on top of any boiler unit prices which is why it’s always worth comparing quotes to find the best deal for your budget.

For our top picks, we’ve included boiler models in a range of sizes. This can affect costs, but we’ve included an estimated new boiler cost range to give you a guideline figure. Here are our picks for the best affordable combi boilers.

Boiler Model OutputsPrice 
(Exc. installation)
Baxi 200 combi 224kW, 28kW£650 - £785
Alpha E-tec Plus28kW, 33kW, 38kW£700 - £1,000
Baxi 400 Combi 224kW, 30kW£850 - £1,000
Worcester Bosch Greenstar 200025kW, 30kW£850 - £1,200

Best energy efficient combi boiler

If saving energy, reducing CO2 emissions and protecting the planet are at the top of your priority list, then you should focus on finding the best energy efficient combi boiler. In terms of fuel type, the electric boiler is (numerically) the most efficient boiler, with 99-100% efficiency ratings - more than any gas or oil condensing boiler (although, consuming electricity can be more expensive, so it won’t necessarily reduce expenditures).

We know that gas boilers are the most common type of boiler in UK homes, but switching to an electric combi boiler could reduce your carbon footprint. This is because they turn 100% of the power from electricity into usable heat (i.e. 1kW of electricity equals 1kW of heat).

One thing you need to keep in mind, however, is that unless your electricity comes from a renewable source, there are higher costs involved - electricity generated from fossil fuels has a significant environmental impact and using more electricity will inflate your average bill costs.

It is possible to generate clean home heating with an electric combi boiler though, if you pair it with solar panels or other renewable energy sources, for example.

We looked at available electric boilers on the market today and chose our top pick to be the Electric Heating Company (EHC) Mercury combi boiler.

The reason we chose this model is because it offers a wide range of output sizes, making it suitable for different property sizes. It also comes with some great features that make it a firm contender against its gas or oil counterparts. Some of its features include:

EHC Mercury Electric Combi Boiler
  • Outputs of 12kW, 14.4kW (single phase - for small properties)
  • 19kW, 26kW (three phase - for larger homes)
  • Compatible with central heating and underfloor heating
  • Includes 5-year guarantee
  • 100% energy efficient (no energy is lost)
  • Includes summer and winter modes to help save energy
  • Silent operation 

Prices range from £1,530 - £1,850 (excl. installation)

If you’re not ready to make a full switch to a renewable energy source and are looking for energy efficient gas boilers, we’ve got that covered! Although most modern condensing combi boilers are around 90% efficient, some brands have created models that go even higher. The table below lists some of the most efficient gas boiler models, with an indication of their price range.

Combi Boiler modelEfficiencyPrice 
(Exc. installation)
Viessmann Vitodens 100-W92%£1,200 - £1,400
Vaillant ecoTEC plus94%£1,500 - £2,100
Worcester Bosch Greenstar 8000 Style94%£1,600 - £1,920

Best combi boiler by power output

Boiler output, measured in kilowatts (kW), refers to how powerful the boiler is and how many radiators or taps it can supply with hot water. Output is often called ‘boiler size’ because the higher the output, the larger the home it is suitable for.

In basic terms, the more kilowatts a boiler has, the more hot water it can supply. It’s really important that your boiler size is right for your home - if it’s too low, you won’t get enough hot water for your needs, but if it’s too high, you’ll end up paying over the odds for the energy to fuel it.

With this in mind, we’ve summarised the correct output sizes below for you to consider. It is always recommended, however, that you get professional advice from a heating engineer before purchasing your boiler so that you get the right size for your unique circumstances.

Approximate Combi Boiler Sizes
House SizeCombi Boiler Size
Flat or apartment with less than 10 radiators (1 bedroom)Up to 20kW
Houses with up to 10 radiators (up to 4 bedrooms)24 - 27kW
Houses with 10 -15 radiators (4 to 5 bedrooms)28 - 34kW
Houses with 15 - 20 radiators (5+ bedrooms)35 - 42kW

When we looked at the best combi boiler models on the market, we noticed that there is a range of options available to suit most houses. Many of the boilers we have already mentioned offer different output sizes that make them great for different homes.

Best small combi boiler

Vaillant ecoTec Plus combi boiler

If you have a small flat or 1-bedroom apartment, with 1 bathroom, you will want to look for a smaller-sized boiler (in terms of water output). The fewer radiators and taps/outlets your home has the less oomph your boiler needs.

Fortunately, some of the best boiler brands do offer models that come in lower output sizes, or which can be adjusted to suit your needs. During our research, we found that the best small combi boiler model was Vaillant’s ecoTec Plus 825.

This boiler has a CH output between 4.2 - 20.4kW and a DHW (domestic hot water) output of 25.4kW, making it perfect for the smallest of spaces. It also comes with Vaillant’s signature features like A-rated, 94% efficiency, ultra-quiet (award-winning!) operation and up to 10 years guarantee. Like all Vaillant boilers, it’s also ready for a 20% hydrogen gas blend for future environmental protection.  Prices range from £1,200 - £1,400.

Best large combi boiler

For those with much larger properties, such as those with 4 or 5+ bedrooms, there are some combi boiler models with the power to provide for your needs. However, if you have more than 1 bathroom plus en-suites or multiple bathtubs and a shower, you should consider a system boiler instead. These boilers store hot water in a separate cylinder and are much better suited to homes with high hot water demands - they will ensure you never lose pressure or run out of hot water when you need it most!

For bigger homes with up to 2 bathrooms, (one bathroom and an en-suite) you can still consider a combi boiler if you are looking to save space. There are two options, you could opt for a high-powered combi (something around 40kW), or a storage combi. Storage combis have an inbuilt hot water cylinder to keep a supply on hand when needed. Few manufacturers currently offer these so the choices may be limited.

The best large combi boiler, in our opinion, is the Worcester Bosch Greenstar 8000 Style, which is available in a huge 50kW! It’s ideal for the largest properties with up to 25 radiators and 2+ bathrooms. As it’s a Worcester Bosch it also has an impressive 12-year guarantee available, A-rated with 94% efficiency and it looks good! You can expect to pay around £2,500 - £3,000 for this powerhouse

Best combi boiler prices

Combi boiler prices range between £650 to £1,600. More expensive models have higher power outputs and more extensive features like better controls, heat exchanges, frost protection, or other additions.

Based on our research, the 5 best gas combi boilers are the Worcester Bosch Greenstar 8000 Style, Baxi Platinum Compact, Vaillant ecoTec Plus, Ideal Heating Vogue Max and Viessmann Vitodens 100-W.

We have provided a breakdown of their prices below.

Combi Boiler ModelPrice 
(Exc. installation)
Worcester Bosch Greenstar 8000 Style £1,600 - £1,920
Baxi Platinum Compact£1,300 - £1,700
Vaillant ecoTec Plus£1,500 - £2,100
Ideal Heating Vogue Max£1,359 - £1,500
Viessmann Vitodens 100-W£1,292 - £2,000
*Prices are estimates only, based on market research conducted in April 2024.

Of the models included above, there is a range of prices based on the size of boilers available. Each product is an example of one of the best boiler brands currently on the market and, as you may expect, the more premium the brand the higher the costs will rise.

The good news is, however, that many of these brands do now offer lower-cost alternatives - particularly some of the Baxi and Ideal ranges - which are worth looking into.

Best combi boiler under £1,000

If you are on a limited budget, or looking for a cheap boiler installation but want to get the best possible option, we recommend you check the models available from Baxi. They currently offer a range of combi boilers that offer you more features the more you pay, which is good for those looking for low costs and no-frills.

No matter which boiler you look at though, be prepared to sacrifice features the cheaper you go - for example, warranties will often be much shorter on cheaper products.

Here is a look at one of the cheaper Baxi combi boilers:

Baxi 200 series

  • Available CH output: 21.8kW
  • Available DHW output: 24kW, 28kW
  • Suitable for: Homes with up to 10 radiators and 1 bathroom
  • Efficiency: 93% and ErP A-rated for heat and hot water
  • Warranty: 2-year parts and labour warranty

Estimated price (Exc. installation): £650 - £900

Combi boiler installation cost

In addition to the upfront cost of a combi boiler, you have to consider installation costs. On average, boiler installation costs in the UK range from £1,000 to £1,500. The two main factors affecting the cost are:

  • Varying labour costs in different areas (usually higher in large cities)
  • The specific combi boiler replacement situation

Best deals on combi boilers

So, how do you find the best boilers in 2024? Probably the most practical way to get the best deals on combi boilers is to try to reduce installation costs as much as possible. You can easily do this by finding and comparing quotes from different heating engineers in your local area.

Whilst efficient, this method has a downside: researching and filtering through dozens of suppliers can be overwhelming and take several hours. You will have to read hundreds of customer reviews and verify credentials to find someone who can install the best boiler for your home.

Instead, you can fill out our simple form to get up to 3 free quotes from installers in your area. To get started just click the button below.

Get your best deal
Quickly compare 3 FREE quotes
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Summary: What is the best combi boiler?

The best combi boiler can vary based on your specific needs and budget. From our research, the Viessmann Vitodens is the best from a price, features, and efficiency standpoint. Aside from its fantastic on-paper specs, it has garnered acclaim as a Design Plus Award winner in 2019.

There are also many other options that also hold promise. For affordable options, the Baxi 200 can be a great low-cost system. Available for as low as £650, it’s a budget option with a great reputation and decent performance.

As a non-gas alternative, the Electric Heating Company (EHC) Mercury is the most efficient electric combi, offering 100% efficiency and easy installation. This model can be the best option for homes outside of the gas grid.

Ultimately, what boiler is best for your home can vary based on your needs. Whether that involves lower cost, better performance, or alternative fuels, there are many options on the market.

Frequently asked questions