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The Best UK Combi Boilers 2021
Like any big-ticket purchase, searching for the best combi boiler can be a challenge. With so many options available and at varied price points, it is hard to know which boiler to choose. However, that’s where we come in. As an independent boiler installation company, we’ve done the hard work for you and picked out the best combi boilers available to purchase in 2021.
To put together this comprehensive list, we have considered the following:
- Price
- Warranty
- Design
- Material quality
- Flow rate
- Customer feedback
- Customer service
- Awards and accolades
In this list, we have looked at combi boilers from the following manufacturers:
- Viessmann
- Worcester Bosch
- Vaillant
- Ideal
- Baxi
- Ariston
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Viessmann Combi Boilers
Founded in Germany in 1917, Viessmann is a fourth-generation family company and operates in 31 countries around the world. Whilst relatively new to the UK, opening their UK office in 1989, Viessmann’s UK domestic boiler market share continues to grow year-on-year.
There are many reasons why Viessmann is quickly becoming a leader in the UK domestic boiler market. Importantly, they know what their customers require and deliver excellent results.
Crucially, every boiler in the Viessmann range is equipped with their patented Inox-Radial stainless steel heat exchanger. This technology efficiently converts the supplied energy into heat whilst consuming lower amounts of fuel, emitting lower CO2 emissions and having less impact on the environment. This efficiency contributes to higher savings on your annual energy bills.
Viessmann boilers are also renowned for their high hot water flow rates.
Viessmann’s quality has continuously been recognised, with the Vitodens range having received Which? Best Buy awards since 2017 based on the reliability of the boilers.
Viessmann Vitodens 200-W
Price (Installed): £3300 (inc. VAT)
| Manufacturer | Viessmann |
| Model | Vitodens 200-W |
| Condensing | Yes |
| Efficiency Rating | 98% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10-year comprehensive warranty when installed by a Viessmann trained installer |
| Mounting | Wall Mounted |
| Weight | 33kg |
| Dimensions | 700mm (Height) x 450mm (Width) x 360mm Depth) |
The Vitodens 200-W is available in the following sizes: 26kW, 30kW and 35KW
| kW Size | Flow Rate |
| 26kW | 10.3 l/min |
| 30kW | 12.3 l/min |
| 35kW | 14.5 l/min |
The Viessmann Vitodens 200-W is a powerful gas condensing boiler designed to be installed in larger homes. A combination of efficiency, low emissions and future-proof technology make it a standout choice as one of the best combi boilers available in 2021.
Our thoughts on this boiler are echoed by the UK’s largest independent consumer body, Which?, who named the boiler one of their ‘Best Buy’ boilers.
A wall-mounted boiler, the Vitodens 200-W is suited to homes with more than one bathroom.
Noted for its efficiency, the boiler has an A ErP energy rating.
Whilst its future-proof technology includes integrated WiFi for remote operation wherever you are and compatibility with the ViCare app, which enables a Viessmann trained installer to be automatically notified in the event of a fault.
Viessmann Vitodens 200-W Features:
- 98% Energy efficiency – almost all of the fuel used is converted into heat
- 5-inch colour touchscreen
- Easy to operate Vitotronic control unit
- Can be controlled via a smartphone app
- Environmentally responsible MatriX cylinder burner
- High-quality Inox-Radial stainless steel heat exchanger
- Lambda Pro Control Plus combustion controller ensures consistently high energy efficiency
- Automatically adjusts to different gas types (natural gas, LPG, biogas)
- Very quietest boiler – operating at just 34 decibels
- Compact dimensions – only 450 mm wide
- Pressure release valve and condensate combined
- Energy efficiency class: A
- Optional remote fault notifications for Viessmann trained installers
- 10-year comprehensive warranty
Read our detailed Viessmann Vitodens 200-W review
Like what you hear about the 200-w? Get a free online quote by entering your postcode below, then hitting the green button!
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Viessmann Vitodens 050-W
Price (Installed): From £2100 (inc. VAT)
| Manufacturer | Viessmann |
| Model | Vitodens 050-W |
| Condensing | Yes |
| Efficiency Rating | 93% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10-year comprehensive warranty when installed by a Viessmann trained installer |
| Mounting | Wall Mounted |
| Weight | 36kg |
| Dimensions | 707mm (Height) x 400mm (Width) x 350mm (Depth) |
The Vitodens 050-W is available in the following sizes: 29kW and 35kW
| kW Size | Flow Rate |
| 29kW | 12.3 l/min |
| 35kW | 14.5 l/min |
The Viessmann Vitodens 050-W is an entry-level option in the Viessmann range. However, whilst being entry-level, this isn’t a budget boiler.
Allowing it to stand out from other combi boiler options at a cheaper price point, the Vitodens 050-W is equipped with Viessmann’s patented Inox-Radial stainless steel heat exchanger for efficiency and energy savings.
Offering compact dimensions, low weight and quiet operation, the Vitodens 050-W makes for an ideal choice for installing into a living space in properties with up to three bedrooms. These compact dimensions also make it an ideal replacement for boilers in multi-storey buildings, where it can be connected to one vertical flue system as a series of up to five boilers.With an integrated water heating system, this combi boiler offers instantaneous hot water. Whilst the optional tado° thermostat and smartphone app allows it to be controlled online wherever you are. Our thoughts on this boiler being one of the best combi boilers available in 2021 are echoed by the UK’s largest independent consumer body, Which?, who named the boiler one of their ‘Best Buy’ boilers.
Viessmann Vitodens 050-W Features:
- Integrated high-quality stainless steel Inox-Radial heat exchanger
- Stainless steel cylinder burner
- Integral instantaneous water heater
- Low CO2 emissions for reduced environmental impact
- Digital user interface with LCD display for easy operation
- Optional room thermostats, plug-in time clock and wireless receiver
- ErP energy rating: A
- 10-year comprehensive warranty
Read our detailed Vitodens 050-W review
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Viessmann Vitodens 100-W
Price (Installed): From £2500 (inc. VAT)
| Manufacturer | Viessmann |
| Model | Vitodens 100-W Combi Gas Boiler |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10 year comprehensive warranty when installed by a Viessmann trained installer |
| Weight | 38kg |
| Dimensions | 700mm (Height) x 400mm (Width) x 350mm (Depth) |
The Vitodens 100-W is available in the following sizes: 26kW, 30kW and 35kW
| kW Size | Flow Rate |
| 26kW | 10 l/min |
| 30kW | 12 l/min |
| 35kW | 14.5 l/min |
Viessmann’s best-selling gas condensing boiler, the Vitodens 100-W is an ideal boiler option for smaller homes including flats, apartments and homes with a single bathroom and up to 20 radiators.
With a 94% efficiency rating, the Vitodens 100-W is one of the most efficient combi boilers available to purchase in 2021. Due to these high-efficiency levels, the Vitodens 100-W has an A ErP energy rating.
As a premium boiler, it’s positioned perfectly as a bridge between affordable combi boilers and top-of-the-range boiler options.
Viessmann Vitodens 100-W Key Features:
- High-quality stainless steel Inox-Radial heat exchanger
- Environmentally responsible MatriX cylinder burner
- Backlit LCD touch screen display
- Pressure release valve and condensate combined for easy installation
- Compact design and low Weight
- Quiet operation with low fan speed
- Low CO2 emissions for reduced environmental impact
- Optional room thermostats available
- Up to 10 year extended warranty available
- LPG conversion kit available
Read our detailed Vitodens 100-W review
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Viessmann Vitodens 111-W
Price (Installed): From £3300 (inc. VAT)
| Manufacturer | Viessmann |
| Model | Vitodens 111-W |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10 year comprehensive warranty when installed by a Viessmann trained installer |
| Central Heating Max. Output | 35 kW |
| Mounting | Wall Mounted |
| Weight | 64kg |
| Dimensions | 900mm (Height) x 600mm (Width) x 480mm (Depth) |
The Vitodens 111-W is available in the following sizes: 26kW and 35kW
| kW Size | Flow Rate |
| 26kW | 18 l/min |
| 35kW | 20 l/min |
With a cylinder loading system and an integrated 46-litre stainless steel storage tank, the Viessmann Vitodens 111-W is a wall-mounted storage boiler ideal for family homes with a higher demand for heating and hot water.
Designed for demanding usage, the Vitodens 111-W is equipped to fill a standard 140-litre bath in under 8 minutes.
Whilst the optional tado° thermostat and smartphone app allows it to be controlled online wherever you are.
Viessmann Vitodens 111-W Key Features:
- Modulation ratio of up to 1:6
- Wall-mounted – allowing greater flexibility for boiler position
- User-friendly control via backlit LCD touchscreen
- Output availability ranges between 4.7 to 35 kw
- DHW (Domestic supply is equivalent to 150L unvented cylinder – due to the advanced CLS (Cylinder Loading System)
- Integration with smart thermostats such as Nest and Tado
- Sturdy casing
- Can be positioned in a number of rooms such as utility room or bathroom
- 46 litre capacity stainless steel integrated storage tank
Read our detailed Viessmann Vitodens 111-W review
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Ariston Combi Boilers
Ariston is an Italian manufacturer who has been producing boilers since 1960. Seen as a mid-range boiler brand, they are well-established throughout Europe and are an emerging brand in the UK.
Predominantly known for space-saving boilers, Ariston offers options for both commercial and domestic applications.
Ariston is held in high regard by heating professionals due to its constant investment in research and product development. It is this research and development which allows for simplified and efficient installation and maintenance.
We believe Ariston stands out for their value for money, offering efficiency, future-proof technology and a great warranty for a mid-range price point.
Ariston Clas One
Price (Installed): From £1780 (inc. VAT)
| Manufacturer | Ariston |
| Model | Clas One |
| Condensing | Yes |
| Efficiency Rating | 90% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | 8 Year Parts and Labour Warranty, when installed by an Ariston recommended installer |
| Central Heating Max. Output | 30kW |
| Mounting | Wall Mounted |
| Weight | 29kg |
| Dimensions | 745mm (Height) x 400mm (Width) x 401mm (Depth) |
The Clas One is available in the following sizes: 24kW, 30kW and 38kW
| kW Size | Flow Rate |
| 24kW | 10.4 l/min |
| 30kW | 12.5 l/min |
| 38kW | 15.5 l/min |
The Ariston Clas One is a lightweight boiler option which not only comes recommended by us but is also a Good Housekeeping UK Reader Recommended product and is an Energy Saving Trust endorsed product. It is these accolades which make this boiler stand out in Ariston’s range.
Key to the Ariston Clas One’s efficiency is its use of Ariston’s patented Xtratech stainless steel heat exchanger.
It comes with an 8-year warranty, which is great for its price point, plus high-end features such as a large backlit display, compatibility with the Ariston Net app, an energy-saving ‘Auto’ function and an easy-to-use mechanical clock. Whilst its lightweight construction makes it suitable for wall mounting.
Ariston Clas One Key Features:
- Xtratech™ stainless steel heat exchanger
- High domestic hot water flow rates
- “Auto” function technology
- Comfort function
- High-efficiency pump
- 1:7 modulation ratio
- Quiet operation starting at 49dB
- Lightweight unit starting at 29kG
- 8-year warranty
- “A” ErP rated for optimum energy efficiency
- Large backlit display
- Includes LPG conversion kit
- Ariston NET compatible
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Worcester Bosch Combi Boilers
Worcester Bosch boilers have long been held up as an example of excellent, award-winning design in the boiler industry. Long established in the UK market, the company was originally founded as Worcester in 1962, before becoming part of the Bosch Group in 1996 and becoming Worcester Bosch.
Worcester Bosch is currently the UK market leader for domestic boilers, with all of their combi boilers being manufactured at their UK headquarters in Worcester. The high standards of manufacturing associated with their Greenstar boilers have seen this range awarded a Which? Best Buy for the past 11 years.
Worcester Bosch Greenstar CDi Compact
Price (installed): From £2,100 (inc. VAT)
| Manufacturer | Worcester Bosch |
| Model | Greenstar CDi Compact |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10 years when installed by an accredited installer |
| Mounting | Wall-mounted |
| Weight | 32.9kg |
| Dimensions | 690mm (Height) x 390mm (Width) x 280mm (Depth) |
The Greenstar CDi Compact is available in the following sizes: 28kW, 32kW and 36kW
| kW Size | Flow Rate |
| 28kW | 10 l/min |
| 32kW | 11.5 l/min |
| 36kW | 12.9 l/min |
The Worcester Bosch Greenstar CDi Compact is a combi boiler designed for larger homes for two or more bathrooms.
A highly efficient boiler, the Greenstar CDi Compact has an efficiency rating of 94%.
However, unlike other boilers at this price point which utilise stainless steel heat exchangers, this boiler’s aluminium heat exchanger is great for thermal conductivity initially but over time this can become prone to corrosion. Due to this, efficiency can be affected.
Worcester Bosch Greenstar CDi Compact Key Features:
- The highest hot water flow rate of the Greenstar combi wall mounted range
- Simple boiler control knobs with clear temperature display
- Low energy pump reduces electrical usage
- Frost protection is included, reducing frost risk if installed in a garage or a loft
- Larger two bathroom properties can be supplied by higher output options
- Wide choice of controls enables greater comfort and economy
- Instantaneous hot water, always available
- Inbuilt keyless filling link making it easy to refill your system
- Large Condensesure style siphon built into the boiler – eliminates frost risk
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Worcester Bosch Greenstar i
Price (Installed): From £1,600 (Inc. VAT)
| Manufacturer | Worcester Bosch |
| Model | Greenstar i |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10 years when installed by an accredited installer |
| Central Heating Max. Output | 24 kW |
| Mounting | Wall-mounted |
| Weight | 31.7kg |
| Dimensions | 710mm (Height) x 400mm (Width) x 330mm (Depth) |
The Greenstar i is available in the following sizes: 25kW and 30kW
| kW Size | Flow Rate |
| 25kW | 9 l/min |
| 30kW | 10.8 l/min |
The Greenstar i is Worcester Bosch’s most popular boiler and the most affordable option in their range. It’s an ideal choice for small to medium sized homes with just a single bathroom.
Its design allows for simple controls and function, and gets the job done. Having said that, there are perhaps better boiler installation options to go for at a similar price point.
Worcester Bosch Greenstar i Key Features:
- Simple boiler controls with clear information display
- Condensate discharge resilient to freezing up to -15°C
- Wide choice of controls enables greater comfort and economy
- Low energy pump reduces electrical usage
- Hot water instantly heated from cold mains
- Achieves an A+ ErP package efficiency rating for heating when installed with a Wave smart internet-connected control
Worcester Bosch Greenstar 8000 Style
Price (Installed): From £2000 (inc. VAT)
| Manufacturer | Worcester Bosch |
| Model | Greenstar 8000 Style |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 12 years when installed by an accredited installer |
| Mounting | Wall Mounted |
| Weight | 53kg |
| Dimensions | 780mm (Height) x 440mm (Width) x 365mm (Depth) |
The Greenstar 8000 Style is available in the following sizes: 30kW, 35kW, 40kW, 45kW and 50kW
| kW Size | Flow Rate |
| 30kW | 10.7 l/min |
| 35kW | 13.1 l/min |
| 40kW | 14.3 l/min |
| 45kW | 16.1 l/min |
| 50kW | 17.9 l/min |
This powerful boiler from Worcester Bosch features a brand new design catering much more to the modern market. It’s capable of delivering up to 50kw, which makes it one of the most powerful wall-hung boilers available. With its large size, it is designed for large homes with more than 1 bathroom.
Worcester Bosch Greenstar 8000 Style Key Features:
- LPG model available
- EasyControl Compatible
- Central heating output 30-35kw
- One of Worcester Bosch’s quietest boilers
- Easy-to-use full-colour boiler display
- Wireless connectivity with the Bosch EasyControl smart thermostat
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Vaillant Combi Boilers
Founded in 1874, Vaillant is a German boiler manufacturer and is one of the leaders in the European heating industry.
A pioneer in boiler technology, Vaillant firstly patented the “closed-system” gas-fired bathroom boiler in 1894, and then pioneered the combi boiler over 35 years ago.
Along with Worcester Bosch, Vaillant has proven themselves to be strong competitors in the UK since first entering the market. As a result, they’ve used this experience to become a top manufacturer, creating front-running products in the industry.
One of Vaillant’s strengths is its development and focus on systems that utilise sustainable energy sources. With high-efficiency ratings and low emissions, they’re proved themselves to be a great choice.
Alongside Viessmann, Vaillant has been a leader in domestic boilers for many years. While many of the boilers in their range still use an aluminium heat exchanger (which definitely has its fair share of negatives), the ecoTEC Plus Combi uses stainless steel which offers greater efficiency. Due to this, many put Vaillant above Worcester Bosch.
Vaillant is also the owner of UK-based budget boiler brand, Glow-worm.
Vaillant ecoTEC Plus Combi
Price (Installed): From £1,748 (Inc. VAT)
| Manufacturer | Vaillant |
| Model | ecoTEC plus 832 Combi Gas Boiler |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10 years when installed by a trained installer |
| Central Heating Max. Output | 25.7 kW |
| Mounting | Wall Mounted |
| Flow Rate | 13 l/min |
| Weight | 60kg |
| Dimensions | 720mm (Height) x 440mm (Width) x 338mm (Depth) |
The ecoTEC Plus Combi is available in the following sizes: 25kW, 32kW, 35kW and 38kW.
| kW Size | Flow Rate |
| 25kW | 10.5 l/min |
| 32kW | 13.0 l/min |
The Vaillant ecoTEC Plus Combi is a high performance yet flexible boiler built in Britain and suitable for a range of domestic applications.
With no need for a storage tank, the ecoTEC Plus Combi is equipped to deliver hot water within 5 seconds with a flow rate of up to 15.9 litres per minute.
Vaillant ecoTEC Plus Combi Key Features:
- Stainless Steel Heat Exchanger
- High performance, control and efficiency
- Precision heating to reduce your fuel bills
- A wide range of heating control options, from a simple boiler timer right up to the vSMART™ smartphone app
- Delivers hot water within 5 seconds (and no need for a storage tank or cylinder)
- 5-year guarantee as standard, with 7 to 10 years available when you book a Vaillant Advance installer
- A flow rate of up to 15.9 litres per min for fast hot water*
- ErP A rated for both hot water and heating efficiency
- Works with LPG where required
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ecoTEC exclusive with Green iQ Combi Boiler
Price (Installed): From £2,173 (Inc. VAT)
| Manufacturer | Vaillant |
| Model | ecoTEC exclusive with Green iQ |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10 years when installed by a trained installer |
| Mounting | Wall Mounted |
| Flow Rate | 17.8 l/min |
| Weight | 50kg |
| Dimensions | 720mm (Height) x 440mm (Width) x 474mm (Depth) |
The ecoTEC exclusive with Green iQ combi boiler is available in the following sizes: 35kW and 43kW.
| kW Size | Flow Rate |
| 35kW | 14.5 l/min |
| 43kW | 17.8 l/min |
This boiler is one of Vaillant’s most eco-friendly boiler options, with 85% of its parts being recycled once it’s reached the end of its life. It’s also compatible with vSMART control, so you can take control from your phone or tablet.
Vaillant ecoTEC exclusive with Green iQ Combi Boiler Key Features:
- Two combination models covering 35 or 43kW output
- A flow rate of 17.8 litres per min for fast instant hot water
- ErP A rated for both hot water and heating efficiency
- Works with LPG where required
Vaillant ecoTEC plus combination store
Price (Installed): From £2,203 (Inc. VAT)
| Make | Vaillant |
| Model | ecoTEC plus Combi Gas Boiler |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | No |
| Warranty | Up to 10 years when installed by a trained installer |
| Mounting | Wall Mounted |
| Flow Rate | 15.9 l/min |
| Weight | 60kg |
| Dimensions | 720mm (Height) x 440mm (Width) x 600mm (Depth) |
The ecoTEC plus combination store combi boiler is available in the following sizes: 38kW
| kW Size | Flow Rate |
| 38kW | 15.9 l/min |
This boiler is one of Vaillant’s most eco-friendly, with 85% of its parts being recycled once it’s reached the end of its life. It’s also compatible with vSMART control, so you can take control from your phone or tablet.
Vaillant ecoTEC plus Combination Store Key Features
- Two combination models covering 35 or 43kW output
- ErP A rated for both hot water and heating efficiency
- Compatible with LPG
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Ideal Combi Boilers
Ideal Boilers first began way back in 1906 in the UK. As they entered the 1920s, they began to take boilers from basements, and move them into the familiar kitchen area that many of us are used to today. As a result of this extensive experience, they have proved themselves as pioneers in high-efficiency technologies.
With a focus on customer usability, Ideal are continually developing their products while retaining their key principles – quality, innovation and value.
Today, Ideal maintains a reasonable share in the UK market, scoring highly on reviews for those of us who want something affordable and reliable.
Amongst their accolades, the Ideal boilers range consists of Energy Saving Trust endorsed products and Good Housekeeping Reader Recommended products.
Ideal Vogue Combi
Price (Installed): From £1,834 (Inc. VAT)
| Manufacturer | Ideal |
| Model | Vogue Combi |
| Condensing | Yes |
| Efficiency Rating | 93% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 10 years when installed by an Ideal recommended installer |
| Mounting | Wall Mounted |
| Weight | 33.8kg |
| Dimensions | 740mm (Height) x 445mm (Width) x 330mm (Depth) |
The Vogue combi boiler is available in the following sizes: 26kW, 32kW and 40kW
| kW Size | Flow Rate |
| 26kW | 10.6 l/min |
| 32kW | 13.1 l/min |
| 40kW | 16.4 l/min |
The Vogue is Ideal’s premium offering. There are three different outputs available for this range (26, 32 and 40). The first and last of which have an efficiency rating of 91.1%, while the 32KW has an efficiency rating of 91%. While there are others on this page with better efficiency, this boiler could still potentially save you money.
Ideal Vogue Combi Key Features:
- Fully colour display thanks to backlit LCD screen backlit 3.5” LCD full-colour display
- Easy to read pressure gauge
- Multi-functional buttons offer a lot of options for control
- LPG conversion available
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Ideal Logic+ Combi Boiler
Price (Installed): From £1,345 (Inc. VAT)
| Manufacturer | Ideal |
| Model | Logic Combi+ |
| Condensing | Yes |
| Efficiency Rating | 94% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Warranty | Up to 7-year boiler warranty & 10-year warranty on the heat exchanger when installed by an Ideal recommended installer |
| Mounting | Wall Mounted |
| Weight | 29.2kg |
| Dimensions | 700mm (Height) x 395mm (Width) x 278mm (Depth) |
The Logic+ combi boiler is available in the following sizes: 24kW, 30kW and 35kW
| kW Size | Flow Rate |
| 24kW | 9.9 l/min |
| 30kW | 12.4 l/min |
| 35kW | 14.5 l/min |
The Logic+ Combi from Ideal is a solid choice for those of us looking to replace our current boiler with something more efficient. With a compact size, it can also fit neatly into a typical kitchen cupboard.
Known for its quiet operation, it does a good job of working silently in the background. With a decent warranty length (7 years), it’s a certainly a good choice – but you’ll have to work hard finding an installer with a close relationship with the manufacturer in order to get anything better.
Ideal Logic+ Combi Boiler Key Features:
- Made in the UK
- Fits neatly into most cupboards
- Good Housekeeping Reader Recommended 2018
- Built-in frost protection
- Energy Saving Trust endorsed
- 7-year warranty & 10-year warranty on heat exchanger
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Ideal Vogue Max Combi
Price (Installed): From £1,706 (Inc. VAT)
| Manufacturer | Ideal |
| Model | Vogue Max Combi |
| Condensing | Yes |
| Efficiency Rating | 93% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | Yes |
| Standard Warranty | Up to 10-year warranty |
| Mounting | Wall Mounted |
| Weight | 33.8kg |
| Dimensions | 740mm (Height) x 445mm (Width) x 330mm (Depth) |
The Vogue Max combi boiler is available in the following sizes: 26kW, 32kW and 40kW
| kW Size | Flow Rate |
| 24kW | 10.6 l/min |
| 30kW | 13.1 l/min |
| 35kW | 16.4 l/min |
The Vogue Max Combi boiler is Ideal’s more recent entry into the premium market. By combining the benefits of the Vogue Gen2 along with a system filter, Ideal does their best to give you everything you need. If you’re willing to invest more money towards your heating, this might be worth a look but prepared for a high price tag.
Ideal Vogue Max Combi Boiler Key Features:
- Easy to read pressure gauge
- Compatible with Ideal controls
- Fault modes accompanied by full-text support
- Accessible user interface with a 3.5in colour LCD display
- Stylish design with simple cover over controls and large dials
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Best Baxi Combi Boilers
Baxi has been manufacturing boilers in the UK since 1866. Throughout this time, they have grown to become a solid company with a rich history and now employ over 6,400 people throughout Europe. Baxi is a household name in the UK and is quickly becoming a well-known company in other countries in Europe too.
Combi boilers form a significant part of Baxi’s range. Across their range of EcoBlue, Duo-tec, Megaflow and Platinum combi boilers, Baxi has options to suit almost any size and type of home.
Baxi is frequent recipients of many industry awards, including those from H&V News and HVR Awards.
Baxi combi boilers typically range from £650 to £1,200.
Baxi 200 Combi
Price (Installed): From £1,550 (Inc. VAT)
| Manufacturer | Baxi |
| Model | 200 Combi |
| Condensing | Yes |
| Efficiency Rating | 89% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | No |
| Standard Warranty | 5 Years |
| Central Heating Max. Output | 28 kW |
| Mounting | Wall Mounted |
| Flow Rate | 9.8 l/min |
| Weight | 26kg |
| Dimensions | 700mm (Height) x 395mm (Width) x 279mm (Depth) |
The 200 Combi boiler is available in the following sizes: 24kW and 28kW
| kW Size | Flow Rate |
| 24kW | 9.8 l/min |
| 28kW | 11.5 l/min |
The Baxi 200 Combi is a compact boiler option, which is designed to fit in a 290mm deep kitchen cupboard.
Weighing just 26kg, the Baxi 200 Combi is lightweight and can be wall-mounted. Offering future-proof abilities, this boiler has a front LCD display and can be operated remotely by using the dedicated app for smartphones and tablets.
Whilst not a revolutionary boiler, the Baxi 200 Combi is a decent choice for a boiler replacement at a great value price point. It is this value for money which earns the boiler a place in this list.
Baxi 200 Combi Key Features:
- Available in outputs 24 and 28kW
- Simple hanging bracket
- Choice of flue lengths
- Compatible with uSense smart control
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Baxi 400 Combi
Price (Installed): From £1,800 (Inc. VAT)
| Manufacturer | Baxi |
| Model | 400 Combi |
| Condensing | Yes |
| Efficiency Rating | 89% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | No |
| Standard Warranty | 5 Years |
| Central Heating Max. Output | 28 kW |
| Mounting | Wall Mounted |
| Flow Rate | 11.5 l/min |
| Weight | 21.5kg |
| Dimensions | 700mm (Height) x 395mm (Width) x 279mm (Depth) |
The 400 Combi boiler is available in the following sizes: 24kW and 28kW
| kW Size | Flow Rate |
| 24kW | 9.8 l/min |
| 28kW | 11.5 l/min |
Much like the 200 series, the Baxi 400 Combi boiler is an example of a typical modern condensing gas boiler that can fit in your kitchen cupboard. With ‘A’ rating for efficiency and smart room thermostat capabilities, you can stay in control of the temperature.
Baxi 400 Combi Key Features:
- Available in outputs 24 and 28kW
- Stand-off frame optional
- Choice of flue lengths
- Compatible with uSense smart control
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Baxi Duo-tec Combi
Price (Installed): From £1,810 (Inc. VAT)
| Manufacturer | Baxi |
| Model | Duo-tec Combi 28 Gas Boiler |
| Condensing | Yes |
| Efficiency Rating | 92% |
| Energy Efficiency Class | A Rated |
| LPG Compatible | No |
| Standard Warranty | 7 Years |
| Mounting | Wall Mounted |
| Weight | 41.7kg |
| Dimensions | 780mm (Height) x 450mm (Width) x 345mm (Depth) |
The Duo-Tec Combi boiler is available in the following sizes: 24kW, 28kW, 33kW and 40kW
| kW Size | Flow Rate |
| 24kW | 9.8 l/min |
| 28kW | 11.5 l/min |
| 33kW | 13.5 l/min |
| 40kW | 16.4 l/min |
Baxi’s Duo-Tec is a condensing gas combi boiler that’s more suitable for medium to larger homes. With features such as the built-in frost thermostat and uSense smart control – the Duo-Tec can achieve an efficiency rating of up to 88.6%. While not as high as some competitors, they still show a commendable focus on efficiency and lowering those energy bills.
Baxi Duo-tec Combi Key Features:
- Available in outputs 24, 28, 33 and 40kW
- Flow rate up to 16.4 l/min
- Full wall mounting jig
- Various flue lengths available
- Compatible with uSense smart control
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Which combi boiler is best for your property?
We’re all aware of how fast technology can evolve. That’s why to answer the question of which boiler is best in 2021, there are a few things to consider that may not be obvious. The main consideration being the size of your property and your hot water demands.
What’s the best combi boiler for a flat or 1-2 bedroom property?
If you have a reasonably small property with around 1 or 2 bathrooms or a flat with one bathroom, you won’t need a high capacity boiler to meet your demands. With a combi boiler, you can enjoy all the saved space thanks to the lack of a cold water storage tank or hot water cylinder.
Winner: Viessmann Vitodens 100-W
On top of becoming a recipient of Which? Best Buy for several years running, the Vitodens 100-W is proof that Viessmann know exactly what they’re doing in 2020.
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What’s the best combi boiler for a 3 bedroom property?
A typical 3 bedroom house will have 1 bathroom, with an additional ensuite and toilet if necessary. A slightly higher capacity boiler between 29-35kw will be sufficient for a property of this size.
You also have the option of a storage combi boiler. These combi boiler alternatives have a built-in hot water storage tank. This means that depending on your mains water pressure, a product like the Viessmann 111-W Storage Combi Boiler can give you up to 20 litres per minute easily.
Winner: Viessmann Vitodens 111-W Storage Combi Boiler
As mentioned above, the Vitodens 111-W serves as an excellent choice for providing you with the hot water you need.
What’s the best combi boiler for a property with more than 4 bedrooms?
If you’re the owner of a larger home with more bedrooms, the demand for hot water will naturally go up along with it. We can’t recommend a small capacity combi boiler to be installed in this kind of scenario, as it won’t be able to cope with the multiple showers, taps and appliances being used at the same time.
However, as we’ve mentioned above, there are some high capacity storage combi boilers that can also be suitable.
Winner: Viessmann Vitodens 111-W Storage Combi Boiler
Which combi boiler has the highest hot water flow rate?
Out of the combi boilers we have recommended here, the Viessmann Vitodens 111-W 35kW combi boiler has the best hot water flow rate. Offering up to 20l/min, this boiler is equipped to provide hot water to multiple sources simultaneously and can fill a standard bath in just 8 minutes, whilst also supplying a sink or washbasin at the same time.
Why have we ranked Viessmann boilers higher than other brands?
Ultimately, the reason for this comes down to the quality of Viessmann’s stainless steel heat exchanger. There is no doubt that stainless steel is a better metal for efficiency. This is due to the higher chromium content making the metal less resistant to corrosion and staining, increasing its durability and ensuring its efficiency.
Stainless steel is extremely resistant to corrosion in a wide range of pH levels. Whereas for aluminium, if the special manufacturer-recommended heat transfer fluids and inhibitors are not used to produce and maintain a narrow pH range, it will corrode much faster and get damaged.
Viessmann’s entire boiler range is equipped with their patented Inox-Radial stainless steel heat exchanger. This is very beneficial if you are looking for a longer-term investment towards the energy efficiency of your home.
Viessmann’s heat exchanger is manufactured in-house, this saves on sourcing costs and makes the price lower for the customer.
Many of the other established manufacturers use aluminium heat exchangers sourced from a third party in France for their combi boilers. Whilst this helps them keep manufacturing costs down and the initial purchase price lower, the use of these heat exchangers is often at the detriment of long-term efficiency.
Why is Durability Important for Energy Efficiency?
If we are comparing two boilers but one has a stainless steel heat exchanger and the other has an aluminium heat exchanger, we will likely see a much quicker drop in efficiency from the boiler using the aluminium component.
As discussed above, this is due to the corrosion faced by aluminium components. If both of these boilers have an energy efficiency rating of 92%, the one with the aluminium heat exchanger will likely drop in efficiency to 85% after just a few years of use due to this corrosion.
The energy efficiency of 92% for a new boiler installation means you’re converting 92% of the fuel into heat, and only losing 8%. In monetary terms that means for every £100 you spend on energy, you’re losing £8. Whilst for a boiler at 85% efficiency, you’re losing £15 on every £100 you spend on energy. That extra £7 lost adds up over time.
In the diagram below, you can see a stainless steel heat exchanger on the left, and a corroded aluminium one on the right. The internet is filled with complaints about aluminium heat exchangers getting damaged due to debris and sludge.
What’s the cost of a new combi boiler?
A straight answer to this question can immediately be tricky. Although the typical price for a new combi boiler could be anywhere between £1,500 to £3,500, the best way to move forward is to speak with a heating professional like Boilerhut to determine your current situation and identify the ideal boiler.
How do I get a combi boiler installed?
If after reading this guide, you have decided a combination boiler is for you, then we will be happy to help.
At Boilerhut, we will provide the information you need and answer any questions you have to help you select a combi boiler which is right for you and your property.
To find out more, either call us on 029 2009 9898 or get a free, no-obligation quote by entering your postcode in the box below.
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