Best Combi Boilers in 2023 (UK Buying Guide)

Are you looking to replace your combi boiler this year but don’t know which one to use? Then you’ve come to the right place!

We compare the likes of Worcester Bosch, Viessmann, Alpha combi boilers and many more to bring you the best combi boilers of 2023.

To provide a comprehensive understanding of the best combi boilers in the UK for 2023, this guide will highlight essential factors such as pricing, warranty, and overall performance. Additionally, it will dive into other crucial aspects, such as installation and maintenance.

This guide will give you the Best Combi Boiler of 2023 and help you to evaluate which is right for you; we offer most of the combi boilers available in this guide. But first, let’s start with what a combi boiler is.

There are dozens of different combi boiler types that each cover hundreds of thousands of models, and sometimes the small differences are the part that changes how well they suit your home.

These days, we are spending a lot more time at home with hot drinks and warm heating, so it might be time for an upgrade - here are some of the best combi boilers in 2023, as well as details on how to choose the right option for you.

Which combi boilers are the best?

#1: Worcester Bosch 4000 combi boiler

#2: Viessmann Vitodens 050-w combi boiler

#3: Worcester Bosch 8000 combi boiler

#4: Ideal Logic Plus combi boiler

#5: Viessmann Vitodens 100-W Combi Boiler

What is a combi boiler?

A combi or combination boiler combines a water heating system and central heating unit into a single body, acting as a unified way to handle heating and hot water without needing two separate boilers.

This means there is no need for a separate water tank system, and therefore takes up less space in your home. A combi boiler is one of the most efficient types of combi boilers to install and tends to be much more reliable than normal combi boilers, which is why we love them so much!

Combi boilers are suitable for most properties

A combi boiler is the best option for almost all properties because it can be easily installed onto the water mains and offer instant control of heating in your home.

Whether your current combi boiler is on the blink, all combi boilers must be replaced every 10 to 15 years. This means that even if you are not currently experiencing problems with your old combi boiler, but it has been in your home for over a decade, it is time to consider what combi boiler can replace it.

Why should I buy a new boiler?

Increased Efficiency

According to the Energy Saving Trust, if your combi boiler is over fifteen years old and is a non-condensing boiler, it will be less efficient and may become faulty and even break down regularly, as a result of corrosion on internal components from the thermal and mechanical stresses over years of constant use.

Not only is this an inconvenience for you, but it could also cost you a lot more money to run an inefficient old boiler that frequently requires costly repairs than running a new A-Class efficiency-rated combi boiler.

New boilers are much more energy-efficient than older models. This increased efficiency will not only help you save money on your energy bills, but it will also help reduce your carbon footprint. Newer boilers can be up to 30% more efficient than boilers that are just ten years old

Improved Reliability

As boilers age, they become less reliable and more likely to break down. If you have an older boiler, you might call for repairs more often than you’d like. A new boiler will be much more reliable and unlikely to need repairs as often

Quieter Operation

If your boiler is making strange noises or seems to be working overtime, it might be time for an upgrade. New boilers are designed to operate more quietly than older models, so you’ll be able to enjoy the peace of your home without being disturbed by your boiler

According to The Energy Saving Trust, you could start saving up to £840 annually on your energy bills by replacing your combi boiler.

You can also have a read up on new boiler costs and how you could save money.

Which combi boiler should I buy?

There are so many combi boiler brands and models to choose from that deciding which combi boiler is best for you might seem impossible.

Combi boilers are also available at many different price points, which is another factor to consider when purchasing.

That’s why we have researched and read plenty of reviews to compile our Top Best Combi Boilers of 2023, with reasons why we love them so much. Keep reading to find out our favourite!

How to find the best combi boiler?

While we have highlighted our top five combis for 2023, there may come a time when you need to shop for a unit on your own.

There are certain features you should look out for when shopping for combi boilers, including:

• Energy Efficiency

• Power Outage

• Size

Energy efficiency of your combi boiler

Combi boilers are given a grade based on their energy efficiency, with an A rating of the highest.

This is a good thing to consider because it will determine how expensive the boiler will be. A more energy-efficient boiler could potentially save you money over time.

Power outage of the combi boiler

The power outage of a combi boiler is listed as kW, which determines the boiler's size. Smaller homes tend to benefit from a combi boiler of between 25kW and 30kW, but this is something your gas engineer can help you with.

Size of the combi boiler

You will need a combi boiler large enough to handle your home heating.

The physical size of a combi boiler unit is also important, as this will determine whether the unit can be installed into your home safely.

How much does a new combi boiler cost?

The average cost of getting a new combi boiler is between £1,500 and £3,000.

However, the cost of a boiler can vary depending on the brand and the type.

When you get a new combi boiler, there are various costs involved that you need to consider along with the price of the unit itself.

Buying a boiler includes installation costs, labour costs, and potentially any additional parts, as well as the price of the boiler itself.

Different gas companies offer varying prices based on boiler location, availability, and location.

For example, those in London will have to pay higher costs than those in the North even if they are getting the same combi boiler installed.

The type of home you live in can also alter the cost of getting a new combi boiler, such as whether you live in a terraced or semi-detached property.

Boiler engineers will also need to consider how many bedrooms and bathrooms are in your home to gauge the kind of combi boiler you need but also the cost of installation.

The Best Combi Boiler Brands

This is it, the top 5 best combi boiler brands in the UK for in 2023:

• #5 Alpha Heating

• #4 Ideal

• #3 Vaillant

• #2 Worcester Bosch

• #1 Viessmann

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#5 Alpha Combi Boilers

In fifth place comes Alpha. This well-established brand has been one of the UK’s leading heating companies for over 50 years, giving them plenty of experience that combines traditional business values with a highly innovative approach to its operation.

Alpha ranks among the best combi boiler because they have amazing A-Class efficiency-rated budget combi boilers that accommodate the needs of every property type and household size.

As part of the Immergas group, which operates in 30 countries and has manufactured over 7 million boilers, Alpha benefits from some of the most advanced production facilities in the world.

This means you are guaranteed a high-quality combi boiler, despite the low prices. They offer a range of combi boiler sizes from the compact E-Tec to the larger E-Tec Plus, which deliver on every aspect.

Alpha Boilers are not quite the best combi boiler on the market but are an amazing budget option if cash is a little tight and you still want a solid boiler built to last.

Great budget boiler

Alpha Boilers is a budget option but manages to balance price with some reliable design decisions to give you a cheap but fairly consistent boiler line.

The Italian design, surprisingly useful parts, and labour warranties mean that each combi boiler will usually work fine in the long term.

A great set of sales and support staff also gives you an easy way to contact them if something goes wrong, and specific boilers have warranties of up to ten years, depending on the model you choose.

Italian quality

While Alpha Boilers may be relatively cheap, they are not poor-quality, so they can become a great mid-range choice when you do not want to go too high or low.

Other than that, there is not much else to say about Alpha Boilers because they are a comfortable middle-of-the-road option that can fit into most homes and businesses without issue.

You are also covered for much longer than the price would suggest, so wear, and tear are not as much of a setback. If purchased through iHeat, you also get a massive 10-year warranty on all Alpha boilers.

Alpha Boiler Range

Alpha E-Tec Boiler

The E-Tec is ideal for small and medium-sized homes. The entire E-Tec range features brand-new stainless steel heat exchangers, making them highly robust, and they also have zinc-plated expansion vessels to prevent corrosion.

Taking these extra steps to maximise the longevity of your boiler life is what makes this range stand out. The E-Tec also has a high-efficiency pump which helps to deliver an impressive 14.1 litres of hot water per minute, and the single electrode drive charge is very easy to access, meaning your Alpha combi boiler will be easy to control and manage after installation.

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Just some of the features of the E-Tec include:

• 10 Year Warranty

• Two available kW outputs

• Combined condensate and pressure relief valve connection

• Single Electrode

• Easy-access dry-change NTCs on front of pipes

Alpha E-Tec Plus

The E-Tec Plus is similar to the E-Tec. Still, it is much larger and has a few extra benefits, such as a 10-year warranty, copper pipe tails with isolation valves, an integrated filling loop, a control panel, and a bottom cover.

This combi boiler is suitable for larger homes and offers a third higher output option than the E-Tec at 38kW

Alpha Evoke

The best combi boilers from Alpha are the smallest. Its compact size and layout are an ideal solution for small to medium-sized homes and has a stainless steel heat exchanger and many other amazing features such as:

• 7 Year Warranty

• Backlit LCD with push button controls and detailed operational information

• High efficiency Grundfos pump and hydroblock assembly

• Single electrode

• Easy access for servicing

• IPX4D protection

• Low electrical consumption

• Easy-access NTCs on front of pipes

• One-piece cartridge diverter valve

• Clip-on DHW temperature sensor

• Dry-change NTCs

• Combined condensate and pressure relief valve connection

• Frost protection and daily pump kick

• 14.1 litres of water per minute

Alpha InTec

The InTec combination boiler is different from the others due to its built-in GasSaver.

This combi boiler is perfect for anyone concerned about their environmental impact. The InTec reduces gas usage by 35% compared to other gas combi boilers and has a low electrical consumption.

Some of the useful features of the InTec are:

• Same connections as a boiler with no additional exposed pipework

• Isothermic stainless steel heat exchanger

• High efficiency Grundfos pump and Hydroblock assembly

• Backlit LCD with push button controls

• Two available outputs

• Easy-access NTCs on front of pipes

• One-piece cartridge diverter valve

• Clip-on DHW temperature sensor to prevent corrosion

#4 Ideal Combi Boilers

In fourth place comes Ideal. This boiler brand is the best at small and affordable boilers, such as the Logic range and flashier pricier models, such as the Vogue range, catering for all their customers and their budgets.

Ideal Boilers has seen rapid growth over the last ten years, and offers a very simple warranty system that gives combi boilers either 2, 7, or 10-year warranties depending on which model you are buying.

Built to last

In terms of quality, they sit around the same level as Worcester Bosch but with a slightly lower price, which can make them more budget-friendly if you are trying to save every penny you can.

Of course, this price depends on the installer, so the cost of getting a combi boiler form Ideal Boilers can vary by location.

When compared side by side, they are a good alternative to Worcester Bosch, and many of their ranges are similar enough to stand in for WB combi boilers if you need them.

Looking for a mid-range boiler, then Ideal may be the Ideal choice 😉

Solid price

A mid-range price and a compact design ensure that these combi boilers can be used in various locations and situations, often knocking around 10% off the price compared to more expensive brands.

However, this comes at the cost of not necessarily having the same features, so that you may lose out on some unique benefits here and there.

Even still, Ideal combi boilers could offer you the best combi boiler depending on what you are looking for and how large your budget is.

They may be cheaper than other choices, but that does not make them worse or less reliable.

Ideal Boiler Range

Logic

Although the Logic combi boilers aren't as flashy as the rest of Ideal’s range, they’re reliable, compact and easy to use, earning The Queens Award in 2013 as well as The Good Housekeeping Award in 2013 and 2017.

Ideal offers a standard 2-year warranty that can be extended to 5 years, though with only a 3% chance of The Logic's best combi boiler breaking down, it looks like you won’t even need it.

Here are some of the features of the Logic boiler:

• Large digital display

• Easy to reach pressure gauge on front panel

• Compact

• Scratch resistant

Vogue Gen2

This is Ideal’s best combi boiler for its features and attractive design whilst remaining compact. It has a backlit 3.5” LCD full-colour display and has multi-function buttons for ease of use, built using premium components.

Endorsed by the Energy Saving Trust, you can be sure that this combi boiler is better for the environment. This boiler comes with a standard 8-year warranty.

Vogue Max

Ideal’s newest premium combi boiler has the same fantastic features and attractive appearance of the Vogue Gen2 with the addition of a high-quality Ideal System Filter, which boosts the warranty from 8 to 10 years.

Some of the other features include:

• Easy to read pressure gauge

• Premium components

• Full-text support for fault modes

• Stylish composite design with damped opening control cover and large rotary control dials

• Service timer with telephone number/service display

#3 Vaillant Combi Boilers

In third place is Vaillant, another Which? Best Buy Award winner. Vaillant is a premium contender and offers a 5-star boiler range for both small and large properties, though they do have premium prices which aren’t too friendly to your bank account.

However, they come with a convenient app to control your heating anytime, anywhere and have a 5-year warranty which can be upgraded to 7 or 10 years.

Valliant is rarely mentioned as often as other top brands. Still, they operate similarly to Worcester Bosch, combining great quality with various useful warranties and customer service options.

Warranties

Warranties generally sit between 2-5 years, depending on the model, with a price range similar to other beloved brands.

One of the main benefits of Valliant is the variety on offer: the ecoTEC combi boiler line has become a favourite for people who want lower energy consumption without losing performance, and the warranty can be upped to ten years with a Valliant Advance Installer.

The improved efficiency can help you save money, just like with Worcester Bosch combi boilers.

Customer Service

Finally, great customer service is always useful, and Valliant is keen to offer it. If something goes wrong and you need help fixing a problem or identifying a failure, then it is not hard to contact them, meaning that you will always have a way to contact the company and won't have to hunt down an obscure email address or phone number.

Vaillant Combi Boiler Range

Vaillant ecoTEC exclusive

This combi boiler is great for larger homes with higher outputs. It has the potential to generate an impressive 17.8 litres of hot water per minute and is eco-friendly and 85% recyclable. Like all Vaillant products, the ecoTEC exclusive has been approved by Quiet Mark, meaning it is one of the quietest products on the market.

Vaillant ecoTEC plus

This is the all-rounder of Vaillant’s combi boilers with the broadest range of kW outputs. It has precision heating to reduce fuel bills, delivers hot water within 5 seconds and has a 5-year standard warranty.

Vaillant ecoTEC plus store

This boiler is a powerful solution for larger homes with its high-performance control, efficiency and an integrated hot water storage device at the back of the boiler. Providing up to 20 litres of hot water per minute and hot water within 5 seconds, this combi boiler appeals to large families with a high demand for hot water and comes with a 5-year warranty.

Vaillant ecoFIT pure

The ecoFIT pure is another of Valliant’s highly efficient, smart control and high-performance combi boilers but much more compact to fit in a kitchen cupboard in a smaller home. This boiler comes with a less impressive 2-year warranty, but there is the option to increase this to 7 or 10 years for an extra cost.

#2 Worcester Bosch Combi Boilers

In second place come the Worcester Bosch boilers, the pioneers of combi boilers. In 2019, they secured a Which? Best Buy award for the 10th year and their bestseller, the Greenstar i can be found in over a million UK homes.

Worcester Bosch is a huge household name in the boiler game for a reason.. reliability! 🏆

If you ask most people what the best combi boiler is, the Worcester Bosch group will always come up. Worcester Bosch covers many boiler types and features, which means they suit many situations.

However, they are also consistent in quality, so there is no risk of a certain model being extremely poor or unreliable.

Warranty

One of the biggest draws is their warranty offers. Depending on the exact boiler model you choose and the features included in the design, you can have a warranty of anywhere between five and ten years.

This means that with Worcester Bosch, you are covered in case something goes wrong, even if the fault only becomes obvious nine years after installation.

Even better, installing more Worcester Bosch products can extend this warranty: adding their filter system to one of their combi boilers can add another year to your overall warranty time, which means that you get even more protection if you gradually upgrade your new combi boiler during the existing warranty period.

Price

Higher quality often comes with higher prices, and Worcester Bosch used to be a major example. Over time, though, some of their models have become much more affordable, and there are monthly payment options for people who can’t afford an up-front cost.

Getting Worcester Bosch combi boilers in 2023 can also be cheaper through third-party installers.

Worcester Bosch Boiler Range

Worcester Greenstar i (Now the Worcester Bosch Greenstar 4000)

The Greenstar i is Worcester Bosch’s most popular boiler that is ideal for small to medium-sized homes and has simple and easy-to-use controls; Worcester's new Greenstar 4000 range has since replaced this boiler. Here are some features of the Greenstar i:

• Condensate discharge resilient to freezing up to -15?

• Wide choice of controls

• Low energy pump reduces electrical usage

• Hot water instantly heated from cold mains

• Achieves A-Rated efficiency

• Fills a kitchen sink in 45 seconds

Worcester Greenstar Si Compact

This combi boiler has the same features as the Greenstar i but is much more compact to fit in a kitchen cupboard. It also has extra features such as frost protection and can fill a kitchen sink in 45 seconds.

Worcester CDi Classic

The Worcester CDI This is one of the more expensive combi boilers available but does guarantee reliability, fuel efficiency and a user-friendly interface. This combi boiler is suitable for many property types and sizes and is available in four heating outputs. Its modulating pump and intelligent controls also allow a 30% electrical energy reduction. It also comes with a 5-year warranty for peace of mind.

Worcester CDi Compact

This boiler is like the classic except much smaller to enable it to fit in a kitchen cupboard, making it ideal for smaller homes. It comes with frost protection, a user-friendly display and simple boiler controls to ensure you can manage your comfort and costs.

Worcester CDi Highflow

This combi boiler is an incredibly useful floor-standing combi boiler for large homes with many bathrooms. It provides high hot water flow rates of over 90 litres of draw-off. It has a wide choice of simple-to-use controls and a temperature display; however, with having such a large unit, a large space such as underneath a kitchen counter is required.

#1 Viessmann (Our 1st Best Boiler Brand)

In first place comes Viessmann. Viessmann surpasses all other best combi boiler brands in the market with their advanced German engineering and efficient heating systems that are a great value for money.

This isn't to say we don't think the other boilers listed in this article are not some of the best combi boilers on the market; the Viessmann is just the cream of the crop!

Their prices are so low that they are still attempting to increase their exposure in Britain, so now is the time to buy yours before the prices rise! Get your fixed quote here.

Built to last

One of their key selling points is the longer lifespan, which makes their combi boilers last much longer than many competing products. Because of this, they will often appear near the top of any best combi boiler list.

Efficiency

Efficiency can mean a lot when it comes to heating, which often makes Viessman a good choice for keeping costs low in the long-run.

Even in designs with a lower maximum heat output, the improved efficiency can save plenty of money and better use the power you are already consuming.

Warranty

All of their models come with ten-year warranties when bought through iHeat, and there are simple finance options available for their more expensive offerings

Even better, most are designed to be silent or near-silent, making all the difference in a crowded home where the boiler can’t easily be tucked away.

Price

In general, Viessman is a great choice for a smaller building, especially if you do not have as much room to store it.

The higher efficiency removes a lot of the hassle from setting the combi boiler up and means more power is packed into a single body.

You can fit a lot of them into existing cupboards or small alcoves, and the long-lasting design prevents them from breaking down easily.

Viessmann Boiler Range

Viessmann Vitodens 050-W

The Vitodens 050-W 29kW, in particular, is the most reliable and has the highest quality with its stainless steel heat exchanger (which makes it extra robust), exceptionally quiet operation and an impressive water flow rate of 12 litres/min.

With compact dimensions and low weight, the Vitodens 050-W will integrate into any home without compromising quality. Winner of 2019 Which? Best Buy award, this combi boiler is Class-A rated for its energy efficiency and is easy to control with an LCD.

Here are just some of the amazing features this combi boiler has to offer:

• 10 Year Warranty when purchased through iHeat

• Integral instantaneous water heater

• High efficiency of up to 97%

• Low CO2 emissions for reduced environmental impact

• Digital user interface

Viessmann Vitodens 100-W

This combi boiler has all the great features of the 050-W as well as extra features such as the extra 26kW output option and the user-friendly backlit LCD Touchscreen for easy operation. This boiler was endorsed by Which? and up to 94% of the fuel used is converted into heat, making it more environmentally friendly and Boiler Plus ready.

Viessmann Vitodens 200-W

If you’re looking for a combi boiler for a larger home, this boiler is for you. It has greater efficiency and lower emissions, with up to 98% of the fuel used converted into heat. Despite having to operate on a larger scale, this boiler remains compact and quiet thanks to its low-speed fan.

Viessmann have made this combi boiler incredibly easy to operate by incorporating a 7” colour touchscreen with an integrated WiFi interface for internet connection. It also has a new environmentally responsible MatriX-Plus burner which automatically adapts to the properties of different gas types to keep costs down and reduce the environmental impact of the boiler.

With its 10-Year Warranty, you can be sure you’ll have a long-lasting and reliable combi boiler.

Viessmann Vitodens 111-W

Viessmann describes its Vitodens 111-W as rapid, reliable and compact- and that it is, it's one of the best combi boilers that Viessmann offer. This combi boiler is perfect for large families with high hot water demand. With this high-performance wall mounted storage boiler, you can be sure there will be no more arguments in the morning about ‘who is using all the hot water?!’.

With the capacity to fill a bath in just 8 minutes, this combi boiler will never fail to provide the means for a relaxing soak. Here are some of the features that are bound to impress even those with minimal boiler interest:

• 10 Year Warranty

• Cylinder loading system (CLS) and integrated stainless steel storage tank

• User-friendly control via backlit LCD touchscreen

• High hot water capability of >18 litres per minute

• Large range of outputs available

• Optional wireless remote available

Honorable mentions

• Glow worm

• Baxi

• Potterton

Glow Worm Combi Boilers

Glow Worm are the opposite of the previous two choices: they might be somewhat simple, but they are also incredibly cheap, often appearing in rental properties and budget renovation projects.

Reliability

Lower reliability can make them a risk in some cases, but they also come with warranties between two to five years, and installation is extremely straightforward.

This gives you a very unique option for situations where a full boiler may not be needed, especially if you are actively planning to replace it with another boiler in the next few years.

This niche is hard to fill with larger and more expensive options, making Glow Worm useful in the short term.

Low low prices

The very low cost can also make them a suitable choice in the long term as long as you can keep replacing or repairing them.

For example, if you save money for a full house renovation and do not want to spend thousands on a top-tier combi boiler, one or two Glow Worm models can do the same job until you are ready to renovate the entire building.

This does not make Glow Worm a bad choice; it just means they are suited to particular situations. If you need cheap, straightforward and functional combi boilers, it is a good place to start looking.

Baxi Boilers

Baxi is another high-quality option that fits somewhere between Worcester Bosch, Valiant, and Ideal Boilers.

Their boiler range includes combi boilers and other varieties, and all of them are relatively easy to install, coming in at a slightly lower price that makes them more affordable in the long term.

Qualify

Baxi combi boilers are designed primarily for homes that do not demand a lot of hot water all at once, meaning that they may not be as effective if you have two bathrooms or multiple hot taps that you are using at the same time.

However, they are very small and can easily be installed almost anywhere in the average home, which makes them a perfect choice if you are looking for a compact solution.

Efficiency

They also come with various efficiency improvements and other benefits, making them very useful if you want to keep your cost down and your heating functioning well.

This combination of compact construction and reduced costs make them a great middle-ground option for most homeowners and ranks them as one of the best combi boilers.

Potterton

Potterton gets high ratings but is not known all that well, and their recent changes to their combi boiler models have given them two distinct types of boiler.

Durability

Older Potterton models are very durable, whereas newer ones are cheaper but lose some of their durability in the process.

Even so, engineers install them purely because of their excellent support, making it much easier to resolve faults or report issues that might be covered under warranties.

They are also the cheapest of the top-tier boiler brands featured on this list, which can make them much more accessible without sacrificing too much in terms of quality.

While Potterton may not be mentioned very often, that does not make them a bad choice, and many people still swear by using them over and over again.

They fill a niche for people who do not have a high budget but still want something more than cheaper options.

Which combi boiler do I choose?

The problem with choosing the best combi boilers is that every homeowner can want different things.

Combi boilers are meant to heat water and provide heating, so they will need to do those basic things, but other features can vary depending on what you are looking for.

For example, some people are desperate for high-efficiency models that cost less to run, especially if they are already on a tight budget and do not want high heating bills that can eat into their savings.

Other people have more than enough money to cover the bills and want higher heating speeds or temperatures instead.

On top of that, some people want the lowest install price and do not care about the actual effectiveness of the boiler, especially in rental properties or homes they are renovating. A cheap boiler can be a good holdover until you are ready to replace it with something more expensive.

Price of a new combi boiler

If the price is all you care about, then the best combi boilers are the ones that do not cost much to install and even less to run. We do also have an in-depth blog on combi boiler costs to help you better decide when purchasing a new boiler.

A cheap but inefficient boiler will add up over time, so something efficient and low-priced can be the best choice in terms of affordability.

If you can get the boiler on a finance plan rather than with an upfront payment, this becomes even better.

Remember that installation fees are sometimes a thing, so you’ll want to keep that in mind if you will not install the combi-boiler yourself.

The more complex the process, the more it can cost, especially if you need new pipes and systems installed so the boiler can connect properly.

Size of the boiler

A bigger gas combi boiler can often be more powerful, but it also takes up more room and will generally make more noise.

If a boiler is too bulky, then you will need space to keep it somewhere, and that can often mean that you will have to do more work opening up space in a wall or building something to cover it.

Conversely, a compact boiler can easily be fitted into existing spaces with minimal effort and usually sounds quieter.

On the other hand, this might also reduce the power it uses and the level of heating that it can offer: improving efficiency but reducing overall strength.

Neither is necessarily better; it comes down to personal preference and the number of items in your home that will need hot water or higher water pressure to operate.

Quality of the boiler

Many best combi's will be built to a high-quality standard. There are rarely any times when a low-quality boiler is better unless it is far cheaper. A single high-quality combi boiler can cost less than replacing a low-quality option multiple times.

If you have the option, always go for the better-quality models if they are available, and be sure to look up any common issues with the boiler before you decide to purchase it.

Warranties can matter a lot, too, since they will sometimes make up for a drop in quality by allowing you to get a replacement or repair job done.

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