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The Best Small Combi Boiler and Compact Boilers for 2024

Best compact boilers and small combi boilers available right now

Small combi boilers are one of the most important items for anyone who needs a kitchen cupboard fit, or compact boiler, so make sure you get the best one for your home if you need a small combi boiler.

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Small combi boilers are preferred by 70% of property owners in the UK due to their efficiency, speed, and compact size, therefore, most of the best boiler brands create boilers that are specifically designed to fit into kitchen cabinets.

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What is the smallest combi boiler?

Small combi boilers are a godsend for those with limited space and are the preferred choice for those who live in smaller properties such as studio apartments and flats, so when it comes to finding the smallest combi boilers on the market, Compare Boiler Quotes has you covered.

Get an online boiler quote now! if you want to invest in a combi boiler.

What exactly is a small combi boiler?

Gas combi boilers, also known as combination boilers, heat and supply hot water.

What was the result? Only one small unit. This innovative piece of equipment promises instant hot water, so get the best combi boiler you can for your home to keep you warm all year.

By heating water directly from the mains, it eliminates the need for a cold water tank and a hot water storage cylinder, both of which take up extra space.

Power outputs for small combi boilers range from 24kW to 28kW because they can provide both heating and hot water, these devices have two sole heat output ratings.

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What is the difference between a compact boiler and a small combi boiler?

Most people believe that a compact boiler and a gas combi boiler are the same things, but in the world of boilers, they have very different features which is great news for people looking for specific ways to help keep running costs down.

What does a small combi boiler do?

The power or heat generated by a small gas combi boiler is measured in Kilowatts.

In essence, it has a lower yield than a traditional product but is still ideal for smaller properties with fewer hot water demands.

Two of the most well-known small boilers on the market today are the Worcester Bosch CDi Compact Combi Boiler and the Worcester Bosch Greenstar 4000 combi boiler.

Compact combi boilers

The dimensions of a compact boiler define it, as opposed to a combi boiler.

This is not to say that some small boiler brands are not compact; rather, compact boilers are designed specifically for smaller properties, particularly city centre apartments with limited space.

Small boilers for kitchen cabinets

Compact boilers are thus an incredible choice for customers who want a boiler that can be neatly stored in a small space, such as a kitchen cupboard.

The Worcester Bosch 2000 combi boiler is an outstanding compact combi boiler for small apartments, flats, and homes with 1-2 bedrooms.

Compact combi boiler dimensions

A compact combi boiler should have much smaller dimensions than a standard combi boiler; here are some dimensions from the Worcester compact range.

Height 690mm x Width 390mm x Depth 280mm

Advantages of Using a Small Combi Boiler for Hot Water

Small combi boilers have numerous benefits, the most important of which is that they take up less space.

The best combi boilers are extremely compact in design and do not have a separate hot and cold water storage tank, allowing them to provide a constant flow of hot water. Simply because of these two characteristics, they are ideal for smaller homes.

In addition to their size and performance, they use a clean water supply. This means that the water isn’t stored in a tank and is instead drawn directly from the mains, avoiding common traditional boiler issues like sludge buildup.

Furthermore, they are highly efficient, and homeowners who install combi boilers in their homes will benefit from lower gas and heating bills.

Why do you need a small combi boiler?

There are numerous reasons why you might necessitate a small combi boiler, but we’ve listed a few.

  • Its small size makes it easy to store
  • Extremely effective
  • Central heating and hot water are readily available
  • Drinkable water supply that is clean
  • It will help you save money
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Top Best Small Combi Boilers

There are numerous small combi boilers available, and we’ve highlighted three of the most trustworthy brands below out all the best manufacturers in the UK right now

1. Viessmann Vitodens 050-w 25kw combi

Rated 9.5/10

The Viessmann Vitodens 050-w is a godsent piece of boiler beauty. Viessmann has been around for 105 years to bring you, the attractively priced Vitodens 050-W which is a low-cost gas condensing boiler with compact dimensions, low weight, and quiet operation that will integrate effortlessly into any living space and does not compromise on quality, making it ideal for both new build homes and modernisations.


  • Energy Efficiency Rating: A.
  • High-performance A-rated Pump.
  • Compact Size (400mm x 707mm x 350mm).
  • Easy-to-use digital user interface with LCD.
  • Class A-rated for energy efficiency and Minimal CO2 emissions, resulting in a smaller carbon footprint.
  • Wireless programmable heating controls and smart learning thermostat compatible.
  • LPG Compatible and Converted.
  • Built-in frost stat.
  • The quietest boiler on the market has a 30 kW output at 45 dB and a 30KW output at 48 dB.
  • WiFi built-in for connectivity anywhere
  • PRV and condensate connection combined for quick and easy installation.
  • With Boiler Central, you get 12 years warranty and that’s 2 years extra free worth £500! Anyone else usually offers 10 years.


  • In low-pressure situations, it doesn’t perform well: Like the majority of combi boilers, this boiler performs best in areas with strong water pressure. If not, you might need to buy more booster pumps.
  • Not all hot water outlets may be used simultaneously: The Viessmann Vitodens is best suited for households with just one bathroom. Because it will flow more slowly if multiple hot water taps are turned on simultaneously.

2. Worcester Bosch Greenstar CDI Compact 28kW

Rated 8.5/10

Being one of the most well-known brands in existence today, it should come as no surprise that the Worcester Bosch Greenstar CDI Compact 28kW came out on top of our list. With its cutting-edge features and small size, it’s a favourite among installers and homeowners alike, especially in UK homes with limited space.

Worcester Bosch Greenstar CDi Dimensions

Height 690mm x Width 390mm x Depth 280mm

It is not just one of the smallest combi boilers available, but it is also one of Worcester Bosch’s most affordable choices. Because of its five-star efficiency rating, ease of use, and ease of installation, it is frequently referred to as an entry-level boiler.

Despite being extremely innovative, this boiler’s digital interface is user-friendly and has received the ‘Best Buy Award from Which?’.


  • There are two versions available: 28kW and 32kW.
  • 10-year guarantee + 10-year warranty
  • A-class boiler
  • High performance
  • lower energy and heating costs
  • Awarded the Which? ‘Best Buy Award’ for ten years running.


  • Simple interface
  • Entry-level boiler 

Final thoughts:

When collecting boiler quotes, you can always ask for a compact boiler, which is a wonderful boiler for individuals searching for a basic yet durable product that will fit into the tiniest places and last the test of time.

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3. Ideal Logic Plus 24kW

Rated 8/10

The Ideal Logic Plus 24, which is a sister product to the +30 and +35 range and is shaped like a gas combi boiler, is another best buy because this British-made item is a well-liked option for homeowners looking to invest in a highly efficient, easy-to-use boiler with a simple digital display, as this is useful for those who want to be informed of boiler problems.

The ErP-compliant Ideal Logic Plus 24 Combi Boiler has an A-rating efficiency standard and complies with all EU standards. Excellent for central heating that costs little.

Best small boilers - The smallest combi boilers for 2022 Compare Boiler Quotes

Due to its dimensions and features, this outstanding entry-level alternative is a preferred option for smaller houses, including apartments and single-occupancy properties with one bedroom and one bathroom. It has flow rates of 9.9 litres and central heating output of 24 kW.

Ideal logic plus dimensions

Height 700mm x Width 395mm x Depth 278mm

A seven-year warranty is included with this model, which has dimensions of 700 mm in height, 395 mm in width, and 278 mm in depth. The after-sales care is also rumoured to be top-notch.


  • Exceptional after-sale customer support 
  • British-made 
  • Compact
  • The warranty is 7 years
  • Highly efficient
  • Lower heating and gas bills
  • Instant hot water
  • Easy installation


  • Suited to smaller properties 

Final thoughts:

Another great option for a basic combi boiler is ideal for compact homes, especially those with restricted space.

Get fixed prices online in just 20 seconds – Click here

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A Buyer’s Guide to Small Combi Boilers

There are several things to think about when buying a boiler, including the price and efficiency rating of the new boiler so you can be sure it won’t cost you in the long run.

Best small combi boiler: By Brand

There are several reputable boiler manufacturers to choose from, so you’re probably wondering which is the best combi boiler. Our combi boilers review shows how important it is to take installation into account when choosing a brand. Technicians frequently have a particular brand, and utilising well-known items makes the installation procedure go much more smoothly.

The following are among the reputable boiler producers of today:

small combi boilers


Never overlook checking the warranty on your boiler. This protects you in the event of an issue from unanticipated charges. A boiler with a ten-year warranty, such as the Worcester Bosch Greenstar 25i range, will shield you from any issues that arise during the first ten years of ownership of the equipment, whether a repair or a replacement boiler quote is required. To maintain the boiler warranty, you must perform a service once a year.

best small boilers (warranty)

Avoid brands with bad warranties. If something goes wrong, you will be responsible for paying the bill in advance, and boiler repairs and replacements are not cheap! We cannot emphasise this enough: have your boiler serviced at least once a year! Choosing a less expensive brand to save money will almost certainly end up costing much more in the long run, so choose a boiler manufacturer that offers a 7-year or longer warranty.

Also, be sure to look up boiler service costs before you call an engineer to see what kind of money you will be paying and what can end up affecting the cost of it.


The installation of a new boiler in your apartment or house doesn’t have to be a challenging procedure.

This process will be quick if you choose a high-quality product from a reputable manufacturer, have the skills and resources to install it yourself or know of a professional installer. If you have a specific boiler in mind, you can get installation boiler quotes before you buy. Even if it is slightly more expensive, you should not let this deter you from purchasing the boiler you want because a high-quality boiler will be more cost-effective in the long run.

best small combi boiler

The average boiler installation cost ranges between £1,800 and £2,000. This is determined by the manufacturer, the design, and the difficulty of the installation; for example, removing an existing boiler will be a larger job and may cost more money.

Speaking with a professional before making a purchase will ensure that you select the best gas boiler for your needs; please ask for more details if necessary to receive the best quotes. Right now, the internet has some great new boiler prices, so don’t let the boiler you’re considering be completely wrong for your home before you pay the full installation cost!

Compact combi boilers – Are parts easy to get?

For compact combi boilers, you will need to repair or replace parts if your new boiler stops operating as it should due to a malfunctioning component, such as a diverter valve or heat exchanger and parts can occasionally be expensive, but at this point, contacting a service technician is essential, this can also be avoided by having your boiler serviced annually.

When purchasing a new boiler, the cost may seem reasonable, but parts may be expensive unless you have a long warranty.

compact boilers (small)

Finding a dependable supplier who can deliver the item quickly is crucial whether you or they order the disputed part because as a house without water, especially hot water, isn’t a happy house, so the sooner your boiler is back up and running, the better.

In light of this, it’s important to pick a boiler from a reliable company that is associated with a vast network of installers, technicians, and readily available parts, as a result, a less well-known brand will probably require a more costly and time-consuming fix, in part because specialised parts and technicians are difficult to locate.

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How big are the majority of small combi boilers?

The Worcester Bosch 32CDi Compact Combi Boiler is the smallest boiler currently available on the market. It has a diameter of 280mm, a width of 390mm, and a height of 690mm. The Worcester Bosch brand has never produced a boiler component as small as this one. Their costs are also quite reasonable.

Small Viessmann boiler

It’s a great option for studio apartments and small homes simply because of its size, and it can be tucked away in kitchen cabinets with ease.

Think about how many showers and faucets you use, as well as how many bathrooms your home has when determining the size of the boiler you require.

Use your current central heating output as a guide to determine the type of boiler you need for the best results.

How many years should a compact combi boiler last?

smallest combi boilers

When purchased from a reputable brand and properly maintained, the majority of modern gas boilers last between 10 and 15 years. If your current boiler is getting close to this age, it may be time to replace it.

However, there is no set date for replacing your boiler. It all boils down to the brand, the amount of time you’ve used it, and how well you’ve cared for it.

What is the smallest boiler you can buy for hot water?

The solution is Worcester Bosch 32CDi Compact Combi Boiler.

This is currently the smallest boiler on the market. This is Worcester Bosch’s smallest boiler, measuring only 390mm wide, 690mm tall, and 280mm deep.

This range can be installed in small spaces such as kitchen cupboards due to its small size. See our Worcester Bosch price guide for more information.

Is it possible to install my compact combi boiler?

If you are unfamiliar with the procedure, it is not recommended that you fit your own.

DIY gas work, on the other hand, is legal, so if you have the necessary skills, you may install your combi boiler.

best boilers for small homes

Certain UK boiler manufacturers prefer that you invest in the assistance of their specialist team for safety reasons, insisting that all employees have a qualification in this area or have gone through specific training. If you decide to install the boiler yourself, the warranty may be voided.

Make sure a Gas Safe registered engineer installs it

Our specialists at Compare Boiler Quotes are Gas Safe registered, meaning they have gone through the procedures in providing you with a safe instalment.

Although combi boiler installation is relatively simple, it can be costly, especially if an old water tank must be removed before installing the new boiler, that being said, if it is a quick fix, it can be completed in under two hours, and once installed, it will last for years if properly maintained.

Combi boilers will also significantly reduce your gas bills, often by up to £240 per year with certain models. Furthermore, installing a combi boiler in your home may increase the value of your property.

Is it true that small gas boilers have a shorter warranty?

When purchasing new or replacement products for small gas boilers, it is critical to select a product with an excellent warranty. Check that any small boiler prices you receive include the warranty.

The warranty time limit is an important consideration when choosing between brands. It ensures that the product is covered if something goes wrong, whether it needs to be repaired or new parts are needed.

The majority of boiler manufacturers provide seven to ten-year warranties. For the best results, choose one that will last as long as possible.

That’s why our partners at Boiler Central offer an extended warranty.

– You get a manufacturer warranty with Viessmann or Worcester Bosch, the manufacturer. This includes call-outs, parts and labour – you can use ANY Gas Safe registered person or company, and this would be valid as per your terms with your manufacturer.

– Boiler Central then extend this warranty by 2 years which is exclusive to them. This warranty period is carried out by ourselves and also includes parts, labour and call-outs.

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How much should I pay for a small gas boiler?

One of your home’s most essential appliances is a new boiler, so it’s critical to spend money on a high-quality model. In the long run, if you don’t, you’ll probably end up spending more money—either on repairs or a replacement.

Make sure you are aware of the variations in prices between each range.

Combi boilers are the most popular choice for homeowners in the UK. Why? They provide hot water quickly and effectively, and they work quickly. However, their small size is the main reason for their popularity; additionally, prices vary depending on the type and brand you choose to purchase. Today’s high-quality combi boilers range in price from £500 to £2000.

More expensive styles are often more technologically advanced and better suited to larger homes. Those looking for an entry-level product will find the low-cost options ideal. Always request multiple quotes for the best results.

What size is a small gas boiler?

Small gas boilers are typically designed to produce less than 25 kW of power, making them ideal for studio apartments, flats, and smaller houses. This may vary depending on the number of residents, the number of radiators, and the typical water usage in the home; for example, a gas boiler with a 25kW output can power a three-bedroom house. A smaller boiler may be the best option for you if you are frugal or spend a lot of time away from home.

CHW (central heating output) and flow rate are the specifications for each boiler range that is currently on the market.

You will need to spend more money on a DHW (domestic hot water) boiler with a higher central heating output if your home has more than three bedrooms, a lot of radiators, and a larger family. If taps and showers frequently run simultaneously, this is a necessity.

When should I buy a small combi boiler?

One of the primary justifications for buying a new boiler is when the cost of repairing your current boiler is no longer reasonable. Another issue is that some old boilers won’t turn off when the temperature has been reached, wasting energy. This is referred to as a “dry cycle.”

Small Worcester 2000 boiler

If your current product lacks a thermostat, which prevents you from controlling the heating and wastes a lot of energy, you might also want to consider investing in a new combi boiler.

If your boiler is an older gas combi boiler with a pilot light, because of this, it is a solid sign that a lot of energy is being wasted (a visible flame). Last but not least, whether you have recently bought a home or are preparing to sell it, now is the perfect moment to buy a replacement if you are remodelling an existing property.

Small combi boiler quotes

In conclusion, you want to purchase a new small compact gas combi boiler or our best combi boiler. Visit right away! Online, we can give you a quote in just a few minutes.

Contact our friendly customer service team if you have any questions; they will be more than happy to assist you with your quotes.

Every online quote is fixed, and we can schedule installation for the following day. Try it right now to find out how much today’s prices for a new small boiler will be.

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