As combi boilers get smaller and more efficient components, their overall size also becomes compact and now you find small boilers that can provide high outputs. This helps when you are looking for boilers that can fit into kitchen cupboards out of sight. But most powerful boilers don’t fit into a standard size kitchen cupboard.
Best compact boilers
These are the best compact combi boilers on our list:
- Worcester Bosch 28 CDI Compact.
- Ideal Logic C30.
- Baxi 600.
- Viessmann Vitodens 050-W.
- Alpha E T-Tec 28.
Scroll down to see why we have chosen these models.
Difference between small and compact boilers
Although you may think they are the same, there is a difference in the trade. A small combi boiler is when the power output in kilowatts is between 24 and 30kW, rather than the bigger 36-42kW range. A compact boiler is when its dimensions are comparatively less than other models from the same manufacturer.
As manufacturers produce the latest boiler models, their aim is to meet both the technical and aesthetic demand of the customer, where the boiler is both powerful enough to provide adequate hot water and heating, but also be out of sight as much as possible to not get in the way.
What size boiler do I need?
Choosing the right size boiler for your needs is a very important decision, both for comfort and your pocket. The main factors to consider are the number of rooms in the property, the number of occupants, the number of bathrooms and demand for hot water.
When do you need a small boiler?
Small and compact combi boilers are ideal if you have limited room as they can fit into tight spaces. A small flat or apartment will be comfortably supplied with heating and hot water with one of these boilers, but they are powerful enough for larger properties too.
Are combi boilers suitable for small flats?
Combi boilers integrate hot water and heating systems into one compact unit so are perfect for small flats or homes, without the need for a separate tank. Out of the 3 different types of boiler systems, combis are the most suitable for smaller properties. Many manufacturers produce combi boilers for those having limited space.
What dimensions is a standard kitchen wall cupboard?
The industry standard and most popular height for kitchen wall units is 720mm (72cm), 360mm (36cm) in depth and 450mm (45cm) wide. If a boiler is wall mounted, you will want to fit it in a cupboard that matches the dimensions of the other kitchen units without sticking out.
Best small boilers compared
| Combi Boiler Brand | Power Output (kW) | Height (mm) | Width (mm) | Depth (mm) |
| Worcester Bosch 28cdi Compact | 28 | 690 | 390 | 280 |
| Ideal Logic C30 | 30 | 700 | 395 | 278 |
| Baxi 600 | 30 | 700 | 390 | 285 |
| Viessmann Vitodens 050-W | 29 | 707 | 400 | 350 |
| Alpha E-Tec 28 | 28 | 712 | 440 | 255 |
All the boilers we have chosen fit within these dimensions and there is enough clearance for them to be serviced when the time comes. They are also familiar brands known to be reliable.
Best Compact Combi Boilers
All the boilers here are available from Boiler Central on the link below:
Worcester Bosch, Ideal heating, Baxi and Viessmann all produce some of the most efficient small boilers on the market and there are good deals to be had for the reliability and cost effectiveness of their products. This is another reason we have chosen these particular boilers in the list. They are ideally priced for the long term with Boilercentral.com
Pros
- Dimensions 690mm Height x 390mm Width x 280mm Depth
- Suitable for small, medium and large-sized properties with one or two bathrooms
- Fits in a standard kitchen cupboard
- Simple boiler control knobs with clear temperature display
- Low energy pump reduces electrical usage
- User-friendly displays for ease of use
Cons
- The Worcester Bosch 28CDi Compact may have limited heating power, potentially not suitable for larger homes or high heating demands.
- It is priced higher compared to some other models, which could be a drawback for those on a budget.
- While marketed as compact, it still requires sufficient installation space, making it less suitable for tight spaces or properties with limited room.
The Worcester Bosch 28CDi Compact is a reliable and efficient combi boiler that offers several advantages. With its compact size, it is ideal for smaller to medium-sized homes, providing reliable heating and hot water solutions.
It boasts high energy efficiency ratings and advanced features, such as modulating pumps and user-friendly controls, allowing homeowners to optimize their energy consumption and achieve cost savings. The Worcester Bosch 28CDi Compact is also known for its durability and reliability, backed by the reputation of the Worcester Bosch brand.
It is a suitable choice for households looking for a compact and efficient heating solution that delivers consistent performance.
Pros
- Dimensions 700mm Height x 395mm Wide x 278mm Depth
- Suitable for small, medium and large-sized properties with one or two bathrooms
- Fully modulating operation to low outputs
- Compact and lightweight
- Wide range of additional flue options
- An easy to see pressure gauge
Cons
- Limited Warranty: The Ideal Logic C30 has a shorter or more limited warranty, which may impact long-term buyer confidence.
- Higher Noise Levels: Users have reported increased operational noise with the Ideal Logic C30, potentially affecting the desired level of quietness.
- Compatibility Limitations: The Ideal Logic C30 may have specific compatibility requirements, which could limit its use with certain heating systems or components, leading to potential installation or upgrade challenges.
The Ideal Logic C30 is a versatile and efficient combi boiler that offers a multitude of benefits. With its compact size and modern design, it seamlessly fits into any home decor.
The boiler provides reliable heating and hot water solutions, ensuring comfort and convenience throughout the household. The Ideal Logic C30 is known for its high energy efficiency and intelligent features, such as programmable controls and frost protection.
It offers easy installation and maintenance, making it a practical choice for both homeowners and installers. With its quiet operation and durability, the Ideal Logic C30 delivers long-lasting performance and peace of mind.
Overall, the Ideal Logic C30 is a reliable and user-friendly heating solution that provides optimal comfort and energy savings for households.
Pros
- Dimensions 700mm Height x 390mm Width x 285mm Depth
- Compact and lightweight design
- Can be installed in a standard cupboard
- Simple to use controls with LCD display
- Comes with 7 year warranty
Cons
- Limited Hot Water Output: The Baxi 600 may have a relatively lower hot water output, potentially not meeting the needs of households with high hot water demands.
- Noisy Operation: Some users have reported that the Baxi 600 produces more noise during operation, which can be a drawback for those seeking a quieter heating system.
- Limited Compatibility: The Baxi 600 may have specific compatibility limitations, which could restrict its use with certain heating system setups or accessories, potentially causing inconvenience or additional costs during installation or upgrades.
The Baxi 600 is a reliable and efficient combi boiler that offers several benefits. With its compact size and high-quality performance, it is well-suited for small to medium-sized homes.
The boiler provides reliable heating and hot water solutions, with advanced features such as digital controls and energy-saving technology. The Baxi 600 is known for its efficiency, helping homeowners optimise energy consumption and reduce utility costs. Additionally, it offers ease of installation and maintenance, making it a convenient choice for both homeowners and installers.
Overall, the Baxi 600 is a dependable heating solution that provides comfort, efficiency, and peace of mind to households.
Pros
- Dimensions 707mm Height x 400mm Width x 350mm Depth
- Ideal for installation in a kitchen cupboard
- Low CO2 emissions for reduced environmental impact
- LCD display for easy operation
- Class A-rated for energy efficiency
- Ideal for properties with up to 10 radiators with one bathroom
Cons
- Higher Initial Cost: The Viessmann Vitodens 050-W may come with a higher upfront price, potentially impacting affordability.
- Complexity of Installation: Installing the Viessmann Vitodens 050-W can be more intricate, requiring professional expertise for a successful setup.
- Limited Availability: The Viessmann Vitodens 050-W may have restricted availability in specific regions, potentially making it harder to find for potential buyers.
The Viessmann Vitodens 050-W is a high-quality and efficient combi boiler that offers several advantages. It provides reliable heating and hot water solutions for residential properties, delivering exceptional performance and energy efficiency.
The boiler is known for its advanced features, including modulating burners and user-friendly controls, allowing homeowners to optimize comfort and energy savings. The Viessmann Vitodens 050-W is built with durable components and offers easy installation and maintenance, ensuring convenience for both homeowners and installers.
Overall, it is a dependable heating solution that provides efficient and comfortable home heating for households.
Pros
- Dimensions 712mm Height x 440mm Width x 255mm Depth
- High efficiency boiler at 93%
- Compact boiler for smaller properties
- Easy to access and use controls
- Seven-year warranty given as standard with this boiler
Cons
- Limited Warranty: The Alpha E-Tec 28 may have a shorter or more limited warranty, potentially affecting long-term satisfaction.
- Higher Noise Levels: Users have reported increased operational noise with the Alpha E-Tec 28, potentially compromising desired quietness.
- Limited Spare Parts Availability: Some users have experienced difficulties in finding or obtaining spare parts for the Alpha E-Tec 28, which can cause inconvenience during repairs or maintenance.
The Alpha E-Tec 28 is a reliable and efficient combi boiler that offers numerous advantages. With its compact and sleek design, it is an excellent choice for modern households seeking an aesthetically pleasing heating solution.
The boiler provides reliable heating and hot water, ensuring comfort and convenience throughout the home. The Alpha E-Tec 28 is known for its energy efficiency and advanced features, such as intelligent controls and modulation technology, allowing homeowners to optimize their energy usage and reduce utility costs.
It offers hassle-free installation and maintenance, making it a convenient option for both homeowners and installers. Overall, the Alpha E-Tec 28 is a dependable and stylish heating solution that delivers optimal performance and satisfaction to households.
A comparison of Worcester Greenstar 28CDi Compact and the Ideal Logic C30
| Features | Worcester Greenstar 28 CDi Compact | Ideal Logic C30 |
|---|---|---|
| Hot Water Output (kW) | 28 | 30 |
| Efficiency Rating | A (ErP) | A (ErP) |
| Energy Efficiency | 94% | 94% |
| Flow Rate (liters per min) | 11.4 | 12.1 |
| Condensing | Yes | Yes |
| Dimensions (H x W x D, mm) | 690 x 390 x 280 | 700 x 395 x 278 |
| Warranty | Up to 10 years | Up to 7 years |
| Display/Controls | LCD Display | LCD Display |
| Flue Options | Horizontal or Vertical | Horizontal or Vertical |
| Additional Features | – Compact size for space-saving | – User-friendly controls |
| installation | – Frost protection | |
| – Quiet operation | – Energy-saving features | |
| – Easy installation |
Which Compact Boiler is Right For You?
Based on the comparison, the Worcester Greenstar 28 CDi Compact is better suited for a small household due to its slightly lower heating and hot water output, as well as its compact size.
The Ideal Logic C30, with its higher heating and hot water output, would be better suited for a larger household with higher heating demands. Additionally, the Ideal Logic C30 offers a higher flow rate, which can provide better performance in larger households requiring simultaneous hot water usage in multiple locations.
View Them Both At BoilerCentral.com Now
Kitchen cupboard safety clearances
Usually, room sealed boilers don’t require much space (under 10mm) when built into a cupboard, but with the door open, need around 500mm. It is important to remember that boilers need servicing and enough space must be left for this and when repairs are needed, the engineer will require adequate access. Check with the manufacturer for the boiler you install.
Related Articles:
- The Boiler Service Checklist: What’s Involved?
- Combi Boiler Pros and Cons: Explained And Compared
- When To Replace Your Boiler: Look for These Signs
*The information in this article should be used for general guidance only and not as financial advice. Full details are on the link in the footer to our disclaimer page. Always discuss your requirements with a competent and suitably qualified professional before undertaking any work.