10 Best Combi Boilers Reviews | Latest Picks of 2020

best combi boilersA nice warm vibe inside your house is not a bad thing, right? Let it be Summer, Winter, or any other season; you want that cozy warm embrace.
I mean let’s face it, even after spending your whole day under the scorching sunlight, your house stays a bit cold, especially at night. Your feet touch the floor, and you feel like something’s just not too right.
Well, you can make the insides of your house warm and cozy 24/7 if you can get your hands on the best combi boilers. No, they won’t keep your house red-hot, but you surely will go lullaby as you get a soothing atmosphere inside.
Want to know about the boilers to buy? Take a tour with me then.

Quick Pick 

best combi boilersIn a rush? If you don’t have time to read all these reviews and you want me to give you a quick recommendation, you can check out the Worcester 7733600052 boiler.

Not only it will save your energy bills and prepare a large amount of water like a pro, but also it ensures ultimate user comfort.

Besides, the reason I’m recommending you this product is because it’s one of the latest ones in the marketplace right now, which obviously comes at an affordable price.

Benefits of Using Combi Boilers

What makes combi boilers stand out compared to regular boilers? Well, it has a lot of benefits that will make your life comfy. Here are some notable benefits.

Heats Up Your Home Fast

If you want to heat up your home quickly, a combi boiler is what you need. It heats up the entire house very fast. As a result, even in freezing cold days, you won’t have any problem without the blanket. It makes your home feel like summer.

Compact Size

Regular boilers are a bit large in shape, while combi boilers are a bit smaller. You don’t need all those big sized water cylinders that you usually find in the airing cupboards.

Combi boilers are very compact in shape and require a very small space to fit in. Besides, you’ll find them easy to install, as well.

Saves Money

Combi boilers use up a little amount of energy to boil an impressive amount of water. If you can get an ERP-labeled combi boiler, it will cut your energy bills short.

10 Best Combi Boilers Review

Want to get your hands on the best combi boiler? Give the reviews a thorough read and pick the one according to your needs.

1# Heatline By Vaillant Capriz 2 24c 24kw Combi Boiler

HEATLINE BY VAILLANT CAPRIZ COMBI BOILER

If you say, ‘Best combination boiler,’ I’ll say ‘Heatline by Vaillant Carpriz 2 24c 24KW.’ Well, at least that’s what pops in my brain almost all the time.

First off, as you’ll take a look at this boiler, you’ll know it will dominate your area with its shimmering aesthetics. The sleek design blended in with the slim body will make you go wow.

Other boilers may disappoint you. At least, when it comes to durability, a lot of boilers often turn out to be a drop-dead machine as you use it for months. With Carpriz 2 24c 24KW, you can taste the difference.

The boiler comes with heavily-built, automotive-grade construction.And the best part? It’s made of pure aluminum that survives all the beatings for years.

Not just looks and durability;you want to have the best taste of functionality, don’t you? This boiler is the perfect catalyst for you then.

The boiler is rated A and has scored 89.3% on the SEDBUK 2009 efficiency rating test. So, when I say it is a high-efficient boiler, I don’t bluff at all.

Hold your horses mate, don’t let your eyebrows go up. Just because I said it’s a high-efficient boiler, don’t start counting your energy bills.  Thanks to the Grundfos modulating pump, the boiler minimizes the use of energy while utilizing it for maximum power.

It’s been labeled with ERP, so you’re getting fewer energy bills at the end of the month.

Your boiler won’t get the freezes in Winter asthe product comes with an in-built frost protection system. This keeps your boiler hot enough to keep on doing its heating job.

To make sure you get the ultimate usercomfort, it comes with easy and user-friendly controls that allow you to experience all the convenience. Besides, the digital diagnostic display adds more beauty to it.

Since it’s lightweight and compact, you won’t face any complication in storing or carrying it.

Key Features

  • The automotive-grade pure aluminum construction confirms its durability
  • It’s a Grade A boiler with an 89.3% efficiency score
  • The boiler feeds on less amount of energy and reduces your energy bills for being ERP-friendly
  • The in-built frost protection system protects its body and pipe against frosts
  • It has got a digital LED display, compact shape for ultimate user comfort

2# Heatline By Vaillant Capriz 2 28kw Combi Boiler

HEATLINE BY VAILLANT CAPRIZ 28KW COMBI BOILER

So, you like everything about Heatline by Vaillant, but you want to take a different taste. Well, you can give the Carpriz 2 28 KW combi boiler a try.

When it comes to boiling the water and churning out an impressive amount of heat, this boiler is a 10 on 10 without any question. The mind-boggling features tell you that it’s worth your every penny.

Durability matters a lot to you, and this boiler makes sure you don’t have to run after a new one within months. It boasts an automotive-grade aluminum construction that ensures maximum durability to survive all the beatings for years to come.

As you run it, the boiler doesn’t get on your nerves with weird buzzing sounds that you usually get from all those mainstream junks, no.  It’s super-quiet, and it will stay quiet over the years.

Furthermore, it beats the pants off every other boiler out there with its efficiency rate,scoringan impressive 89.3% on the SEDBUK 2009 efficiency-test. Do you know what this means? It utilizes all its energy to boil up the water faster than anything else.

But hey, being efficient simply does not mean it will raise your energy bills at the end of the month. Thanks to the Grundfos modulating-pump, the boiler minimizes the amount of energy it uses. In fact, it’s rated A and has an ERP energy-labeling, which certifies its contribution to reduce your energy bills.

When it’s freezing cold in the winter, your boiler won’t fail to heat everything up. It comes with an in-built frost protection system that prevents it from getting all frozen up.

To make sure you get the ultimate user comfort, it has got the analog timer, which is easy to use 24/7. The modern LCD diagnostic display, on the other hand, adds a more premium outlook to it.  It’s lightweight and takes only a few minutes to install, so there’s no chance of getting any drag.

Key Features

  • It’s durable enough to last for years, thanks to the automotive-grade aluminum construction
  • Scored 89.3% in the SEDBUK efficiency test, so you won’t have any doubt about its performance
  • Rated Grade-A with ERP label on it. This ensures it eats up a little amount of energy
  • To protect it from freezing cold, the boiler has got an in-built frost protection feature
  • The LCD display lets you experience improved user-interference

3# Heatline By Vaillant Capriz 2 28c 28kw Combi Boiler

HEATLINE by Vaillant CAPRIZ 28KW Combi Boiler

Still looking for the best combination boiler? You might want to check out the HEATLINE by Vaillant CAPRIZ 2 28C 28KW Combi Boiler. What hasn’t it got? Durability, functionality, outlook, you name it. The boiler has got everything to meet your taste.

First off, as you take a look at it, you’ll know for sure that this boiler is an absolute premium one. The posh look it boasts will let you know it deserves your money.

The digital LCD display it has got gives you not only user comfort but also shimmers a next-gen vibe that enhances its beauty as it blends in with the sleek design.

But hey, all that glitters is not gold, right? At least, you’ll see a lot of boiler with good outlooks in the marketplace, but most of them will turn you down with their low-end quality.

This boiler turns the table, though. It’s been made with heavy-duty automotive grade aluminum. The whole construction makes it durable enough to survive all the tough-condition for years.

So, you got the beauty and strength. What about its performance? Heatline wins here as well with its jaw-dropping efficiency. It utilizes all of its energy and converts it to the power it needs to offer you hot boiled water.

With ascore of about 89.3% on the SEDBUK 2009 efficiency-test, the boiler providesthe ultimate boiling experience you’ll ever get.

But here’s the fun fact. Even though it boasts an outstanding heating capacity, the boiler requires very less input electrical energy. I’m not kidding. The Grundfos modulating-pump is there to minimize the energy consumption it takes from your power source.

Besides, the boiler has been rated A that comes with an ERP energy-labeling to reduce your energy bills. So, at the end of the month, you get to save a lot of money as well.

In the freezing days, you may face issues with other boilers while getting heated. But this boiler will keep doing its heating job as it does forthe rest of the year. Thanks to its in-built frost protection feature, it stays safe from getting frozen up. As a result, you can expect those hot boiled water even when the temperature is on the minus.

Key Features

  • It boasts a premium-quality outlook with a sleek design and slim shape
  • Heavy-duty automotive aluminum structure helps it to survive for years
  • It has scored 89% in the efficiency test, so you can expect a high-efficient performance
  • Since the boiler is ERP-labeled, it reduces your energy bills
  • There’s no chance of getting frosts on the pipes during winter, thanks to the in-built frost protection system

4# Ideal Exlcusive2 24Kw Combi Boiler

Ideal Exlcusive2 24Kw Combi Boiler

Ideal Exclusive 2 24kw is one of the top rated combi boilers that have made it to the pinnacle ofthe marketplace right now.It stands out completely against its competitors, and you should get your hands on it.

The boilerhas a 24-kW central heating output, which makes it one of a kind as an entry-level product. If you have an apartment or own a small house, this one is the perfect catalyst for you. It has a 9.9 Liters-per-minute water-flowrate, which should be enough for you and your family.

If you are worried about all those unwanted buzzing noises, it’s time to wave them off. Ideal Exclusive2, even though being a high-efficient boiler, makes no sound at all during operation. Besides, it has achieved a Quiet-Mark certification, as well.

The more carbon emission your boiler can reduce, the less energy it will use up to work. Even though Ideal Exclusive2 24Kw Combi boiler does all the heating job like a beast, it’s not that power-hungry at all.

This boiler is ERP rated, which means, it minimizes the carbon emission and needs less amount of energy to run. It uses this small amount of energy to get all juiced up.As a result, you get to save a lot of energy bills at the end of the month.

Just when I said ‘less amount of energy,’ don’t mistake my words for its efficiency at all. The boiler boils your water unlike anything else with its 94% efficiency rate, which obviously is a grade A. So, the next time you question its power, you might want to check these features.

As far as your comfort is concerned, you will find an easy-operating experience and it’s just a piece of cake.  It has got a standard control-panel that features advanced mechanical dials.

Also, the LED digital display lets you figure out faults when there’s any malfunction. You’ll find the controls on the full-display. It’s a next-gen alternative to those boilers that have controls behind their flaps.

Key Features

  • You can boil up to 9.9 Liters of water per minute with this boiler
  • The boiler has achieved quiet-mark certification, so you get a silent boiling operation
  • It reduces your energy bills since it’s an ERP-labeled product
  • It is 94% efficient when it’s about boiling water quickly
  • The LED display, along with the easy-to-access controls, gives you easy user-interference experience

5# Ideal Exclusive2 30Kw Combi Boiler

Ideal Exclusive2 30Kw Combi Boiler

So, you love the boilers from Ideal Exclusive, but you want to check other models, as well. The Ideal Exclusive2 30Kw combi boiler is one of the most efficient ones if not the most efficient boiler you’ll find.

It has got alluring aesthetics that will push you to get your hands on it. But just as it looks, it focuses on the functionality more.

As you take a look at it, the digital LED display will catch your attention. You notice it’s got something more than usual. It’s the size. Unlike the usual boilers, you’ll find this display quite larger. As a result, you get to experience improved user-interface.

Connecting your boilers with your system can give you a bummer. The wires get twists and tangles, and most importantly, some of them do not even have tight connectivity. And the next thing you know, your wires are pulled off.

This boiler changes the whole game. It has got Open-Therm wirings that give you improved connectivity to your water system. Besides, you can connect it with Boiler Plus since the Ideal Exclusive2 30Kw combi boiler is compliant to it, as well.

When it comes to using energy, the boiler utilizes everything to get powered up and turn your water scalding hot. However, you don’t have to worry about your energy bills, though.

Even though the boiler uses all of its energy to juice-up, it feeds on alittle amount of the whole energy from your power source. Besides, it’s one of those few boilers that have been rated Grade-A and labeled with ERP, so it reduces the energy use to save your bills.

As you turn on the boiler, it heats up the water and boils it super fast, making sure you’re getting 12.4 liters of hot boiled water per minute.

Lastly, you’ll love the boiler because it’s very light in weight and you can carry it using your bare hands. The manufacturers constructed it in such a way that you’ll be getting easy access to all of its components whenever you want to.

Key Features

  • It has a larger LED display compared to the typical ones
  • The Open-Therm wirings let you experience improved connectivity without tangles and twists
  • It’s an ERP-labelled boiler, so it minimizes your energy bills at the end of the month
  • The boiler boils up to 12.4 liters of water per minute
  • It’s lightweight, so you won’t have a hard time lifting it

6# Ideal Exclusive2 35Kw Combi Boiler

Ideal Exclusive2 35Kw Combi Boiler

Ideal Exclusive2 35Kw can be your best buy combi boiler that comes at an affordable price, yet with jaw-dropping features. The key difference it has compared to other boilers from Ideal Exclusive is the flow-rate of water it comes with.

Yep, if you want to have a hotter water-flow rate within almost the same budget range from Ideal Exclusive2 series, you should pick this one, keeping your eyes closed. This model prepares 14.5 Liters of scalding hot water per minute.

To take your comfort zone to the new heights, the boiler has got everything covered like a pro. The digital LED display not only dominates the outlook but also helps you to experience improved user interference with its large screen.

Connecting your boiler with your water supply systems won’t be a problem from now on. The boiler backs you up with Open-Therm wirings that connect to almost all types of water supply systems easily. No tangles, no twists like your earphones.

Heat is what you need, right? Most combi boilers use up too much energy to get powered up. At the end of the month, you’re just left with regret as you get the increased energy bills.

Let the Ideal Exclusive2 35Kw deal with the game. It is ERP certified, which ensures that this boiler feeds on less amount of energy from your electrical power source. You don’t have to doubt its efficiency as it scored 91% on the SEDBUK rating test in 2005.

So, being one of the boilers that use up this much energy to power you up with everything, this one can be the most reliable combi boiler for you.

Key Features

  • It prepares 14.5 Liters of hot water per minute for you
  • The digital LED display lets you focus on malfunction easily since it’s larger in size
  • With its Open-Therm wiring system, you’re getting easy connectivity to the power source
  • The boiler is ERP certified, so you won’t have to worry about energy bills anymore
  • It ensures a highly efficient performance since it scored 91% in the SEDBUK efficiency test

7# Worcester 7733600010 Combi Boiler

Worcester 7733600010 Combi Boiler

Looking for the most efficient combi boiler? If you own an apartment or live in a small house, Worcester 7733600010 combi boiler can be the perfect pick for you. It swanks exhilarating features that will make you say, ‘Take all of my money!’ It’s this good.

You can say goodbye to those days when your boiler used to take your water bills to its boom. Worchester has got your back now. It uses very less amount of energy since its ERP-friendly, for which you’ll be able to cut down your energy bills by 15 to 20% easily every year.

One of the most important reasons I recommend Worcester is for the fact that it holds the heat in it and re-uses it for later use. I mean you don’t see that every day, do you? This is one more reason your energy bills will stay to their limits.

Don’t mistake its energy-consumption power for its efficiency. The boiler may use less energy but utilizes every bit of it to stay true to its heating-job. It’s a Grade A boiler that boils your water more quickly than ever.

Boilers that have their controls on their backs are disappointing. You literally have to struggle a lot to get to the controls to start the heating operation. Worcester saves you from the drag with its simple controls as they’re easy to access.

I got a question for you. When’s the time of the year, people usually face problems with their boilers? You’re right, WINTER! Typical boilers have pipes that get frozen up in the winter, and you can’t do anything about it.

Or CAN YOU? This boiler from Worcester is an exception.It has got an in-built frost protection system that keeps its body and the pipes hot even in winter. As a result, you get to use your boiler for years.

Worried about the storage? The boiler is pretty compact in shape, so even if you got places with space issues, the boiler could easily fit inside almost anywhere. It’s lightweight, so you won’t have a hard time carrying or lifting it.

Key Features

  • The boiler reduces your energy usage and bills by 15 to 20% annually
  • It is a Grade-A boiler, which ensures high-efficient performance
  • You can have easy access to its controls and experience the ultimate user-comfort
  • Its built-in frost protection system saves it from frost 24/7
  • The boiler is compact in shape, so you won’t have any problem fitting it in even in small space

8# Worcester 7733600032 Combi Boiler

Worcester 7733600032 Combi Boiler

This7733600032 is another great model from Worcester thatpeople are craving for. The reasons? Well, you’ll have your answer if you take a look at its features.

First off, this model actually focused more on the compactness. Let it be anywhere, bathroom, kitchen, and you name it, the combi boiler will blend in perfectly almost anywhere. 

Plus, it actually adds more décor to your house. I mean, you’ve seen the boilers with all those big pipes. Them being exposed can mess up the looks of your house.

The 7733600032 from Worcester is one of those few boilers available in the market that do not require any exposed pipework. You can easily mount it on the wall, thanks to its metal-wall mounting frame. The pipes will be left behind without being exposed.

Typical combination boilers emit a lot of carbon dioxide and nitrogen dioxide, which can be harmful to your health. If you have one of these, it needs to go right away.

Get on your hands on Worcester 7733600032 instead. It comes with an eco-friendly attribute that reduces carbon dioxide and nitrogen dioxide emissions by minimizing the carbon footprint.

In the winter, you don’t have to worry about your boiler anymore. There’s no chance of this one getting the frosts. Thanks to the in-built frost protection system, the insides and the outsides of the boiler stay warm all the time.

With all that being said, let’s not forget about its efficiency. It boils the water faster than anything else. But don’t you worry about the energy bills though. This boiler scored above 90% when it comes to efficiency in the SEDBUK BAND rating test.

Ultimately, this means you get to use up to 15 to 20% less amount of energy altogether throughout the year. As a result, it will save you money, as well.

Key Features

  • This boiler has a very compact shape, so it’s easy for you to fit it even in a small space
  • You can mount it on the wall without the pipework being exposed
  • It minimizes the emission of carbon footprints reducing your health risk
  • The built-in frost protection system prevents the pipe from getting frozen
  • The boiler scored 90% in the SEDBUK BAND rating test

9# Worcester 7733600052 Combi Boiler

Worcester 7733600052 Combi Boiler

Woah! Don’t get shocked as I bring you another unique model from Worcester. I can’t just stop talking about this brand;it’s that good. Worcester 7733600052 is the latest model from this giant, so if I skipped it, I would be doing an injustice to you.

Doesn’t matter if you own an apartment or a small house;this combi boiler can blend in perfectly to fit your space and, most importantly, your taste. With this combi boiler in your house, you get from 10.2 to 12.3 Liters of water per minute.

Surprisingly, you’re getting all your water boiled up in exchange for very low energy costs. The boiler has been rated Grade A in the SEDBUK rating and labeled as ERP-friendly. It has crossed a 90% efficiency rate like a pro, which is obviously a plus for you as it’s cutting your energy cost to 15 to 20%.

Boilers can be a threat to your health if you rely on the typical ones. Most of them emit carbon dioxide and nitrogen dioxide, which are quite injurious. With Worcester 7733600052, you won’t have to worry about this problem.

It is completely eco-friendly and minimizes the carbon-footprint emission, for which, you stay without being exposed to any threat.

This boiler has got loads of features, yes. But there’s no room for you to think that it’s hard to use it because it’s not.  For your ultimate comfort zone, this boiler churns out easy-to-use controls. The large digital display will let you see how the boiler is operating.

You can easily control the temperature by using the knobs that the boiler shows off. Just simply turn them clockwise or anti-clockwise to adjust your desired temperature.

Plus, you don’t have to worry about frosts appearing on the pipes of your boiler when it’s winter. The in-built frost protection feature has got your back. It ensures the boiler stays warm 24/7.

Key Features

  • You can boil up to 12.3 Liters of water per minute
  • The boiler has scored over 90% in the SEDBUK efficiency test
  • It reduces your energy bills and usage to 15-20%
  • The boiler is completely eco-friendly and reduces carbon footprint emission
  • Its in-built frost protection system prevents frost from appearing on the boiler

10# Sigma Dual 20Kw Combi Boiler

Sigma Dual 20Kw Combi Boiler

Your search for the best combi boiler may end right now with the Sigma Dual 20Kw combi boiler. This one is a different one as you’ll need it if you want to do some gasification job.  Not only water, but you can also fuel pellet, wood, and oil with this stunning beast.

Wait, are you worried about the ashes? You don’t want to get your place messed up, do you? Well, this boiler takes care of all the mess all by itself. With its advanced self-cleaning system, the boiler gets rid of all the ash leftovers like a pro.

Normal pellet combi boilers do not have much of a space. This can be a drag when you want to burn an impressive amount of wood or pellet in one go.But this boiler changes the game with its 6mm large filling space made of high-quality stainlesssteel.

Efficiency matters a lot, but most boilers simply eat up all the energy from your power source, but they never tend to offer you the functionality you need. The combi boiler from Sigma is an exception. It uses only a small amount of energy to stay efficient enough to heat a large amount of wood and pellet.

The boiler comes with an 89% efficiency rate,which makes it one of the most powerful boilers available in the market right now that deals with all the gasification works.

When it’s about boiling water, the boiler offers you the best taste. Unlike any other boilers, you can heat up to 175 liters of water in one go with 90 degrees Celsius of temperature at max.

Key Features

  • With this boiler, you can burn woods, pellets, oil along with water
  • The advanced self-cleaning system gets rid of the ash-leftovers easily
  • You can burn a lot of woods and pellets in one go, thanks to the 6 mm of wide space
  • It has scored 89% in the efficiency rate test
  • You can boil up to 175 Liters of water altogether

What to Look for Before Buying Combi Boiler

So, you’re going to buy a combi boiler? Cool. However, do you know you can end up buying the wrong product if you don’t have any idea on what features to look for?

Chill out! I’m going to let you know the things you need to consider before buying a combi boiler.

Durability

Obviously, you want your product to last for the long run. So, make sure you buy a boiler that is made out of heavy-duty material. I prefer going for the boilers that are made of automotive-grade pure aluminum construction.

Which Size Should You Go for?

Getting the right sized boiler is a must for your home. You don’t want something that is neither too small nor too big for you, right? Besides, the size of your apartment or home matters, as well. Based on the size of your apartment or your home, you have to decide which boiler size you should go for.

For example, if you have a small house with 1 or 2 bedrooms and with about 10 radiators and 1 bathroom, you can go for the size ranging from 24 to 27kW.

Let’s say, you have a medium-sized apartment or a house with 3 to 4 bedrooms. You also have about 15 radiators and up to 2 bathrooms. I’ll suggest you go for the boilers within 28 to 34 kW size range.

Boilers with around 35 to 42kW size range are the best choices for you if your house is a large one with about 4 bedrooms, 20 radiators, and more than 2 bathrooms.

Is It ERP-Labeled?

Getting a boiler that is ERP-friendly is a must if you want to save your energy bills at the end of the month. If your boiler is an ERP-labeled one, it will turn a very little amount of energy into high-efficiency output. As a result, you’ll get the power you need,and, in the meantime, your energy cost will be saved.

Efficiency Score

Another way to test if your boiler is efficient or not is by checking out the SEDBUK efficiency score. Go for the boilers that scored at least 89.3 %. These boilers will give you mind-blowing performance, preparing red-hot boiled water. The more score, the better.

Flow Rate

If your boiler does not boil an impressive amount of water per minute, it won’t do you any good. And if I were you, I would go for the boilers that boil at least 9 liters of water per minute.

Frequently Asked Questions

1. Which is best, combi boiler or condensing boiler?

If you want to save your energy bills, a combi boileris the best pick for you. Besides, they use up very little space to fit in and heats up the water fast.

2. What are the pros and cons of a combi boiler?

Combi boilers are compact in shape, save your money, and offer you high-efficiency. However, if it breaks down, you can say goodbye to your central heating, as well.

3. Can a combi boiler run hot water and heating at the same time?

No, it cannot.

4. Can a combi boiler run a power shower?

The short answer is NO. You’ll need a separate hot water cylinder for a power shower, and combi boilers do not have one.

5. What type of shower do I need with a combi boiler?

You can go for either an electric shower or a digital one. Also, these boilers are compatible with mixer showers, as well.

6. How long do combi boilers last?

If you buy a good-quality combi boiler, it will last about 15 years.

Conclusion

Well, now that you’ve read about the best combi boilers, it’s time for you to put on your jacket and get yourself one. The boilers I’ve talked about are the hot-running products in the market place now. Even though some of them have few drawbacks, but at the end of the day, all of them hold stunning features.


So, no matter what you get, I can tell this for sure that if you get one of these boilers, you’re definitely going to win.

You may also like to read: Best Rheem Hybrid Water Heater Reviews

My name is Bob Carter and I’m in charge of the research team for Best Choice Makers. Professionally I’m an electrician. I’ve dealt with several electronics, electrical installation and maintenance projects for home, business, and organizations. Finally, with 'Best Choice Makers' I’ll be able to share my experience with you guys. Apart from being an electrician, I’m a passionate guitar player.

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