A combination or ‘combi’ boiler acts as both a central heating boiler and also a high-efficiency water heater in a single compact unit. Combi boilers heat water immediately from the trunks when you turn on a tap so that you do not require a cold water storage tank or a hot water storage cylinder on the rooftop.
Combi boilers combine heating and hot water in a single device that may be used on demand. Combination boilers may run on a variety of fuels, making them excellent for new installations or replacing older, inefficient versions. Compact combi boilers are available from the UK’s main manufacturers in a variety of power (KW) ratings. For small, medium, and large households, as well as certain commercial applications, the range includes a variety of products with varying guarantee lengths.
It’s usually easier and less expensive to set up, and it’s also less expensive to run. Several Suppliers and Companies, as well as various manufacturers and distributors, have introduced combi boilers, and there are many Combi Boilers for Sale on Linquip. There is a complete list of combi boiler services on the Linquip website that covers all OEM fleets. Linquip vendors can assist you with this. Please contact Combi Boiler Experts in Linquip to learn more about how to connect with a diverse group of service providers who consistently deliver high-quality products.
They are also cost-effective and energy-efficient as water is boiled spontaneously rather than being heated and collected in a cylinder. An additional benefit is that hot water is produced at mains pressure, which indicates that you could get a mighty shower without the requirement for a separate pump.
In summary, combi boilers have the following features:
- Compact sizes make combi boilers ideal for smaller homes
- Perfect where there is little or no attic space
- No need for a hot water cylinder allows extended living space
- No cold water storage tank frees up an attic for conversion
- No risk of attic pipework freezing
- They typically have the cheaper installation cost due to the less pipework needed
For more information about combi boilers, visit here.
List of 12 Best Combi Boilers in 2024
According to the factors that we will mention in this article, Here is the List of 12 Best Combi Boilers of 2024:
- Ideal Logic C30 Buy Now
- Worcester Bosch Greenstar 30i Combi Boiler Buy Now
- Alpha E-Tec 28kW Combi Boiler Buy Now
- Worcester Bosch Greenstar 8000 Buy Now
- Viessmann Vitodens 100-W Buy Now
- Vaillant ecoTEC Exclusive with Green iQ Combi Buy Now
- Baxi 200 Combi Boiler Buy Now
- Potterton Assure 36KW Buy Now
- Betacom₄ Combi Boilers Buy Now
- Viessmann Vitodens 050-w Buy Now
- Ariston Clas ONE Combi Boiler – Clas ONE 30kW Buy Now
- Navien NCB Combi Boiler Series – NCB-240/110H Buy Now
How We Selected the Best Combi Boilers of 2024
Selecting a proper combi boiler is crucial for your home’s heating and hot water needs. A combi boiler acts as both a central heating boiler and a high-efficiency water heater in a single compact unit. Combi boilers heat water immediately from the trunks when you turn on a tap, so you do not require a cold-water storage tank or a hot water storage cylinder on the roof. Combi boilers combine heating and hot water in a single device that may be used on demand. Combination boilers may run on a variety of fuels, making them excellent for new installations or replacing older, inefficient versions.
We picked the best combi boilers of 2024 by analyzing more than 15 web pages and hundreds of products and reviews, consulting with our experts, and considering various factors such as efficiency, size of the property, hot water usage, existing system, heat loss, etc. We also considered customer feedback and ratings to ensure that we provided you with the most reliable and trustworthy information possible. Our team of experts has years of experience in the industry and has helped thousands of homeowners find the perfect combi boiler for their specific needs. We are confident that our selection of the best combi boilers of 2024 will help you make an informed decision when choosing your next boiler.
Energy Efficiency Ratings: We evaluated each combi boiler’s energy efficiency rating, such as the Annual Fuel Utilization Efficiency (AFUE) and the Seasonal Efficiency of Domestic Boilers in the UK (SEDBUK) rating. Higher efficiency ratings not only ensure lower carbon footprints but also translate to reduced utility bills over time. This criterion is particularly crucial in the context of rising energy costs and growing environmental concerns.
Warranty and After-Sales Support: The length and comprehensiveness of the warranty offered with each combi boiler were considered critical factors. A longer warranty period indicates the manufacturer’s confidence in their product and offers peace of mind to homeowners. We also looked at the quality of after-sales support provided by manufacturers, including the availability of spare parts, the responsiveness of customer service, and the presence of a reliable network of certified technicians for installation and maintenance. This ensures that the boilers we recommend are not only top-performing but also backed by adequate support throughout their lifespan.
Different Types of Boilers
If you’re going to replace your boiler, we are here to assist you in picking the best boiler for your specific requirements and budget. Doing the arduous work for you, our guide to the best combi boilers in 2021 looks at the best boilers for a particular purpose.
All modern boilers these days are condensing boilers. Condensing boilers can be extremely similar, and this is why every detail includes. To arrange this article, we have looked at the internal elements employed in each of these boilers and looked at how this explains the quality and long-term efficiency.
To enter the topics, let’s first describe the available types of boilers.
- The combi boiler: The combination boiler is compact and profoundly efficient, making it proper for small places or properties that do not have sufficient space for a boiler. These boilers operate as both a central heating unit and a water heater. They operate by heating water directly from the pipes, so they do not need a hot water storage barrel or cold water vessel. Nevertheless, it’s essential to note that it is not feasible to run two showers or baths simultaneously utilizing a combi boiler, and hence this type may not fit households with multiple bathrooms.
- The conventional boiler: Also recognized as the regular or traditional boiler, conventional boilers consist of both a water storage tank and a cylinder, and consequently, they need more space. Conventional boilers can provide large volumes of hot water to various bathrooms and taps simultaneously and are perfect for larger households. They are also compatible with solar thermal arrangements, making them an energy-efficient alternative.
- System boiler: Like a conventional boiler, a system boiler needs a hot water storage cylinder but not a water container. This is because several of the main components, including the expansion vessel and pump, are assembled into the system. System boilers are regularly easier to maintain as there is no requirement for a tank, excluding the worry of any leaks or damage. If you own a home that doesn’t possess space for a tank but has several bathrooms, a system boiler may be fitting.
Are Combi Boilers Being Phased Out?
In 2025, the standard will take effect. After 2025, the International Energy Agency has said that no new gas boilers should be sold. All gas boilers should be prohibited by 2033, according to the UK’s official climate consultants, to reduce the UK’s additional contribution to climate change.
In all new-build homes by 2025, gas boilers will be replaced with renewable heating systems. This is part of the government’s plan to reduce CO2 emissions to zero by 2050.
Buying Guide for the Best Combi Boiler
To ensure you pick the right boiler, several considerations should be taken into account. Whether you are substituting an aged boiler in your new home or this is your first time purchasing one, the subsequent factors will assist you in choosing the right boiler for your application. It is crucial to note that an expert and sophisticated gas engineer will be capable of advising you on the best boiler for your home and needs.
Efficiency
If you have central gas heating, your boiler will estimate around 60% of your home’s CO2 emissions. This offers your choice of boiler a key superiority if you’re looking to diminish your energy bills and carbon footprint. Boiler efficiency is an indispensable part of our boiler reviews. The reality is that there is not much variation in boiler efficiency when it comes to modern condensing boilers, i.e. most will be around 90% efficient. Substituting an old-fashioned non-condensing boiler with a new condensing system can enhance efficiency by as much as a third. It also saves you a meaningful amount on your energy bills. But the key to obtaining the most efficient modern boiler is choosing the right kind and size boiler for your house.
Size of Property
The type of boiler you pick will depend on how many areas you possess and your property’s size. In addition to producing hot water, your boiler will also probably be the central source of heating for your home, and accordingly, you need to pick a big enough boiler to heat your entire property. Domestic boiler size is estimated in terms of heat output, ranging from 5 to 35 kW.
Hot Water
The type of boiler you need also depends on your hot water usage. If there is possible to be a requirement for hot water simultaneously at various outlets, then a conventional boiler or a system boiler, which comprises a hot water cylinder, may be more proper than a combi boiler; however, this depends on whether there is adequate space available.
Existing System
It is also essential to consider your current boiler system. Do you want to keep the same system, or would a modified boiler be better adapted to your property? In the majority of situations, maintaining the same system is more efficient and less costly. Though, there are cases when a shift to a different system can save households bills in the long run and run more efficiently. More traditional properties may prefer to renew their boiler with a new system.
Heat Loss
There is no point in having an effective boiler and warming system if most of the heat that is being produced is escaping your home. Not only is this a waste of energy, but you could get a surprisingly high bill from your electricity supplier.
There is a calculation that can be applied to work out how much heat your property is missing. It considers the room area, the number of radiators, doors, and windows, and the quality of insulation in your home. A specialist can calculate how much heat your house will dissipate on the coldest day of the year and apply this information to work out the optimum boiler size.
Choose an Experienced Engineer
It would be best if you always chose an expert engineer who has particular experience in carrying out your work. Look for a well-established company or a trader who has been in the business for a couple of years; this will guarantee they know what they are doing. Do not hesitate to ask to see samples of their previous work or read past customers’ reviews.
Here, we introduce some of the best combi boilers of 2021. As we are going to introduce all of the significant features and options of the best combi boilers, you can readily buy one by following this article.
Top Combi Boilers Reviews
1. Ideal Logic C30
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | Up to 10-year warranty |
| Output | 30kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
If you’re seeking a new combi boiler, then the Ideal Logic C30 Combi Boiler could be an excellent option for you. The ideal is another brand granted for the quality of their boilers and assessed on their affordability. If you seek the best boilers in 2021, you should look at the collection they have prepared.
The Logic C30 Combi Boiler is a section of the brand’s innovative ErP (Energy-related Products) range of products. This selection of boilers is all compliant with the EU’s ErP rating system, which the Union introduced in 2015.
Being both a combi boiler and part of this energy-efficient range from Ideal Logic makes this solution an exceptional option for environmentally-conscious homeowners attempting to diminish their carbon footprint and also save money on their energy bills.
2. Worcester Bosch Greenstar 30i Combi Boiler
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | 10-year warranty |
| Output | 30kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
The Worcester Bosch Greenstar i range is the fabulous boiler range that everyone has discovered of combi boilers. There is a great reason for it too. This boiler is outstanding at what it does at the right value. Secure, simple to use, and in everyone’s cost range. It is not the most affordable boiler you can purchase, but you can get all you expected from a boiler.
The Greenstar i range is available in various outputs, but we believe the 30i will be getting installed. Just the correct amount of power coupled with great efficiency and hassle-free heating – all backed up with a tremendous 10 years warranty as standard.
3. Alpha E-Tec 28kW Combi Boiler
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | 10-year warranty |
| Output | 28kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
Alpha Innovations are swiftly growing as a household preferred choice. These are [laced in our list due to the exceptional value the Alpha E-Tec range proposes. Heat exchangers are made from stainless steel and with 10 years warranty express this boiler is built to last. It may not have the Worcester or a pedigree but can absolutely give them a run for their budget. Small and compact, this brand of boilers is earning recognition.
4. Worcester Bosch Greenstar 8000
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | 12-year warranty |
| Output | 30kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
Worcester Bosch has been recognized as the market head, and for a good reason, they have provided some of the best modern combi boiler choices for years. They have consistently delivered the best quality products and boilers in the UK, which is why they rank among one of the best combi boiler manufacturers in 2021. They have obtained so many awards for a few of their boilers, providing you with more reasons to buy a Worcester for your current boiler installation.
5. Viessmann Vitodens 100-W
Buy Now on Amazon for US$12,974
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | Up to 10-year warranty |
| Output | 30kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
The Viessmann Vitodens 100-w is another well-known brand that is trusted due to the high quality of their boilers, and they have also been encouraged for their affordability. If you are seeking the best boilers in 2021, you should glance at their available models.
6. Vaillant ecoTEC Exclusive with Green iQ Combi
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | Up to 10-year warranty |
| Output | 30kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
Vaillant is another famous brand, producing combi boilers. Most lately, their EcoTec range has become their most famous product line. They do not have behind their company branding as Worcester does, but the support network is there. They suggest exceptional warranties and a service team to help with obstacles for boilers that are under warranty. Ordinarily, their products have a 2, 3, or 5-year warranty assigned to them.
7. Baxi 200 Combi Boiler
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | 3-year warranty |
| Output | 28kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
Baxi might not be counted amongst the premium boilers of the market, though they surely have some premium goods backed up by award-winning customer service and great warranties, so if you are searching for a deal, you might find it in a BAXI combi boiler. Like other brands, BAXI offers a variety of boilers, including regular, system, and combis. Regarding their price range, they are slightly less than a Worcester Bosch equivalent.
8. Potterton Assure 36KW
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | 5-year warranty |
| Output | 36kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
Potterton apprehends a thing or two about boilers, having produced their efficient and reliable systems since 1850. Potterton has joined the Baxi heating group in 2000 and has manufactured qualified and affordable products since.
9. Betacom₄ Combi Boilers
Specifications
| Boiler Type | Combi Boiler |
| Fuel Type | Gas |
| Boiler Warranty | 5-year warranty |
| Output | 30kw |
| Energy Rating | A Rated |
| Boiler Controls | Wireless controls |
| Smart Thermostat Compatible | Yes |
| System Cleanse | Yes |
| Boiler Filter | Yes |
General Descriptions
Glow-Worm tends to sit in the “best of the rest” category, with other boiler makers such as Vokera and Potterton. Glow-Worm is a cheap boiler brand. They tend to be utilized on budget renovations and rental properties. Reliability-wise, they are surely not known for being up there with Worcester, Ideal, Vaillant, and Baxi.
That said, they do offer 2 and 5-year guarantees on their boilers, so in the short term, they are cost-effective. However, it is not all bad news. Glow-Worm boilers are typically priced as “special offers” at local plumbing retailers. So, that suggests they are cheap to buy and affordable to install. Expect Glow-Worm to be priced comparable to Vokera boilers, if not a little more affordable.
10. Viessmann Vitodens 050-w
One of the greatest combi boilers we have come across is the Viessmann Vitodens 050-w. It is completely dependable, hydrogen-ready to 20%, and being German-manufactured, you can be confident that there will be years of trouble-free heating. In comparison to the other boilers on our list that utilize aluminum, the Viessmann Vitodens 050 employs a stainless steel heat exchanger, which is better and will last far longer and be more dependable—everything you want in a boiler. Since its arrival last year, the 30kw version of the Viessmann Vitodens 050-w combi boiler has outsold the 25kw version and is currently ahead of the most recent Worcester 4000 boiler. Regarding mid-range combi boilers, the Vitodens 050 is not the most costly boiler, costing less than its top rivals. This Viessmann combi boiler is ideal for kitchen cabinets since it is small, compact, and extremely quiet. It has a 10-year warranty from Viessmann or a 12-year warranty from Boiler Central. Not only that, but Viessmann also has a dependability record of over 98% and is rated outstanding on Trustpilot. The math simply works out for this comb heater.
The Ariston Clas ONE Combi Boiler is part of Ariston’s high-efficiency series designed for residential use. The Clas ONE 30kW model, particularly, stands out for its combination of performance, energy efficiency, and user-friendly features. It incorporates modern condensing technology that captures heat usually lost in older boilers, ensuring more efficient use of fuel and lower heating bills. This model is especially known for its quiet operation and compact design, making it suitable for installation in various home sizes, including those with limited space. Furthermore, the Ariston Clas ONE 30kW boasts user-centric features like a backlit LCD display for easy control and monitoring, as well as a range of in-built safety mechanisms to ensure reliable operation. The boiler is compatible with Ariston’s range of controls and accessories, allowing for a more customized heating experience. Its design focuses on both functionality and aesthetic appeal, making it an attractive addition to a home’s utility setup.
The Navien NCB-240/110H is part of Navien’s innovative NCB series of combi boilers, renowned for their energy efficiency and versatility. This particular model is designed to provide both home heating and hot water in a single, compact unit, making it an ideal solution for homes where space and efficiency are paramount. It’s equipped with advanced condensing technology, which allows for higher efficiency by capturing more heat from the combustion process, leading to reduced energy consumption and lower utility bills. One of the standout features of the NCB-240/110H is its dual primary and secondary heat exchangers made of stainless steel, which offer durability and resistance to corrosion. This boiler is also known for its eco-friendly profile, as it produces low NOx emissions, aligning with many modern environmental standards. Additionally, it offers considerable flexibility in installation and piping, making it a viable option for various home layouts. A combi boiler is a high-efficiency central heating boiler and water heater in a unique compact unit. Combi boilers heat water directly from the pipes when you turn on a tap so that you do not require a hot water storage barrel or a cold water storage container in the roof space. They have the following advantages: They have the following limitations: For larger houses with several bathrooms, especially with showers in use simultaneously, a system boiler with a large hot water barrel is almost always a more suitable option. Bigger combi boilers have been produced to provide appropriate amounts of hot water, but they make the heating system less efficient. One can expect most current combi boilers to last at least 15 years. Many companies offer a 10-year warranty for their products. It’s Forbidden. To install a boiler, you require to be on the Gas Safe Register. If you ever hire someone to manage your boiler, you can check that they are on the register, i.e. they have a Gas Safe Identification Card and a license number. Without it, you are breaking the law by carrying out this sort of work. If you need a modern boiler and you have limited space in your home, you comprehend how vital it is to have the proper combi boiler. Whether you require hot water or heating demands, you won’t get very far without the proper boiler. These types of boilers are really essential for a broad range of purposes, from heating the required water for your bathrooms to providing the proper amounts of heat to your home for your comfort. The proper boiler can perform everything you require for a comfortable apartment. Taking the best gas combi boiler guarantees that you have one that is durable and efficient. It holds your central heating system operating at the ideal temperature with hot water ready as and when you demand it. Here we have introduced 9 of the best combi boilers widely accepted as excellent choices for your home. According to your budget, you can select the proper one. We have also specified the pros and cons along with specifications and general descriptions of these selected combi boilers. We have also discussed various essential parameters of selecting an appropriate combi boiler from different perspectives. By using Linquip RFQ Service, you can expect to receive quotations from various suppliers across multiple industries and regions. Click Here to Request a Quotation From Suppliers and Service Providers Read More on LinquipSpecifications
Boiler Type
Combi Boiler
Fuel Type
Gas
Boiler Warranty
10-year warranty
Output
3.2 to 32kw
Energy Rating
A Rated
Boiler Controls
Wireless controls
Smart Thermostat Compatible
Yes
System Cleanse
Yes
Boiler Filter
Yes
General Descriptions
11. Ariston Clas ONE Combi Boiler – Clas ONE 30kW
Specifications
Boiler Type
Combi
Fuel Type
Natural Gas
Boiler Warranty
Typically 2 to 5 years (varies by supplier and can be extended)
Output
30kW
Energy Rating
A-rated for heat and hot water
Boiler Controls
Backlit LCD display with user-friendly interface
Smart Thermostat Compatible
Yes (compatible with various smart controls)
System Cleanse
Built-in auto-diagnostic system
Boiler Filter
Optional (compatibility with various external filters)
General Descriptions
12. Navien NCB Combi Boiler Series – NCB-240/110H
Specifications
Boiler Type
Combi
Fuel Type
Natural Gas/Liquid Propane
Boiler Warranty
Typically 10 years on heat exchanger, 5 years on other parts (varies by supplier)
Output
Heating: 110,000 BTU/h; DHW: 199,000 BTU/h
Energy Rating
ENERGY STAR® certified
Boiler Controls
Front panel control with intuitive display
Smart Thermostat Compatible
Yes, compatible with select models
System Cleanse
Self-cleaning system for maintenance and efficiency
Boiler Filter
Not included; compatible with external filters
General Descriptions
FAQs about Combi Boilers
What is a combination boiler?
What are the benefits of a combi boiler?
What are the limitations of a combi boiler?
Which one is better: combi or system boiler?
How long does a combi boiler last?
Can I install my combi boiler?
Conclusion
Download The 12 Best Combi Boilers of 2024 PDF
Buy Equipment or Ask for a Service
I have a Navien natural gas combi boiler that is 10 years old. It is starting to fail on the hot water demand. There are only 2 people in my hometown that are certified to service Navien. These 2 people are in different service companies. And for both, service is scheduled 1 month out, leaving one with cold showers for too long!
What boilers have the best support?
Location: Eugene, Oregon, USA
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