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Best Combi Boilers 2021
If you are searching for the best combi boiler for your needs, we are here to help you.
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.
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What makes a good combi boiler?
Before we start providing our recommendations, it makes sense for us to explain what makes a good combi boiler.
A good combi boiler is one that ultimately meets the specific needs of your household and property. A combi boiler will meet your specific needs by being correctly sized. Choose the wrong size combi boiler and you will either end up spending too much on your heating and hot water, or you will end up not being delivered with the levels of hot water you require. We go on to assist you in choosing the correct size combi boiler for your property further down in this guide.
In addition to being correctly sized, we have also considered the following factors to put together this comprehensive list of the best combi boilers 2021:
- Price
- Warranty
- Design
- Material quality
- Flow rate
- Customer feedback
- Customer service
- Awards and accolades
Is a combi boiler right for you?
To identify whether a combi boiler is right for your property, your main consideration should be the size of your property and your hot water demands.
Combi boilers are great for properties with limited amounts of space, as they don’t require the hot water cylinder or cold water tanks needed with conventional and system boiler systems. However, combi boilers aren’t just for smaller properties. There are now combi boilers available for properties from a 1 bedroom flat to a 4 bedroom house.
To identify whether a combi boiler is right for you, you shouldn’t just be considering the size of your property. You should also be considering the hot water needs of your household. If you have multiple bathrooms and will be utilising multiple showers and taps simultaneously, a combi boiler probably isn’t the best choice for you.
To assist you in determining the best combi boiler for your property, we have selected the best combi boilers for specific property sizes below.
Already know what boiler you need?
Choosing the best size combi boiler for your property
As a rule of thumb, the more bedrooms and bathrooms you have, the higher the output boiler you require. However, to assist you further, we have put together the following table so that you can match the right size boiler to your property size.
| BEDROOMS | BATHROOMS | NUMBER OF RADIATORS | FLOW RATE | RECOMMENDED OUTPUT (KW) | SUITABLE BOILER |
| Up to 2 | 1 | Up to 10 | 10 l/min | 26 | Viessmann Vitodens 100-W Combi |
| Up to 2 | 1 | Up to 10 | 10.2 l/min | 24 | Worcester Bosch Greenstar 25i Combi |
| Up to 2 | 1 | Up to 10 | 9.6 l/min | 24 | Vaillant ecoTEC pro Combi |
| Up to 3 | Up to 2 | Up to 15 | 12 l/min | 30 | Viessmann Vitodens 100-W Combi |
| Up to 3 | Up to 2 | Up to 15 | 12.5 l/min | 30 | Ariston Clas ONE Gas Combi |
| 4+ | 3+ | Up to 20 | 20 l/min | 36 | Grant VortexBlue |
| 4+ | 3+ | Up to 20 | 14.3 l/min | 35 | Viessmann Vitodens 200-W |
Later on in this guide, we have given our recommendations on the best combi boiler models for flats, 1-2 bedroom properties, 3 bedroom properties and properties with more than 4 bedrooms – see our recommendations.
Comparison of the UK’s best-known combi boiler brands
Combi boilers are available from many boiler manufacturers operating in the UK. Below, you will find an overview of some of the most popular combi boiler brands available in the UK.
| Brand | About the brand |
| Alpha
| Alpha has been offering boilers to the UK market for over 50 years. Its current combi boiler comprises the E-Tec Plus, E-Tec and Evoke ranges. Alpha combi boilers utilise stainless steel heat exchangers, come in outputs from 28kW to 38kW, and are available with up to a 13 year warranty. Alpha offers gas combi boilers. |
| Ariston
| Ariston has been producing boilers since 1980, manufacturing its combi boiler range at its production facility in Italy. The company offers four combi boiler ranges – the Alteas ONE Net, the Genus ONE Net, the Clas ONE and the E-Combi ONE. Ariston combi boilers are available in outputs from 18kW to 38kW, feature Ariston’s patented Xtratech™ stainless steel heat exchanger, and are available with up to a 12 year warranty. Aristion offers gas and LPG combi boilers. |
| Atag
| Founded in The Netherlands, ATAG has been designing and manufacturing boilers for almost 70 years. The boilers in ATAG’s combi boiler range, called iC Combination, come in outputs from 24kW to 40kW, feature its iCon stainless steel heat exchanger with a lifetime guarantee, and are available with up to a 14 year warranty on the boiler itself. Atag offers gas combi boilers. |
| Baxi
| Baxi has been manufacturing heating systems in the UK since 1866. Its current combi boiler range comprises the 200 Combi, 400 Combi, 600 Combi, 800 Combi, 636 Combi LPG, Duo-tec Combi, Platinum Combi, Platinum+ 40kW Combi, 400 Combi LPG, 600 Combi LPG and Duo-tec Combi LPG. Baxi combi boilers come in outputs from 24kW to 40kW, feature aluminium heat exchangers, top quality brass components and are available with up to a 10 year warranty. Baxi offers gas and LPG combi boilers. |
| Biasi
| Manufacturing domestic boilers in Italy since the 1940s, Biasi has been providing combi boilers to the UK market since 1990. The current Biasi combi boiler range comprises the Advance Plus 7 Combi and the Advance Combi. Biasi’s combi boiler range is available in outputs from 25kW to 35kW, features stainless steel heat exchangers, and comes with up to a five year warranty. Biasi offers gas and LPG combi boilers. |
| Ferroli
| Founded in Italy in 1955, Ferroli has been providing combi boilers to the UK market since 1988. Ferroli’s current combi boiler range, called Bluehelix Tech RRT, comprises boilers available in outputs from 24.5kW to 34kW, features stainless steel heat exchangers, and come with a 10 year warranty. Ferroli offers gas combi boilers. |
| Glow-worm
| Glow-worm has been producing boilers for the UK market at its production facilities in Derbyshire since 1934. Glow-worm currently offers combi boilers across three ranges – Betacom₄ combi boilers, Easicom₃ combi boilers and Energy 35 Store combi boilers. Across its boiler ranges, Glow-worm offers combi boilers in outputs from 24kW to 35kW. Glow-worm combi boilers feature aluminium heat exchangers and come with up to a 5 year warranty. Glow-worm offers gas and LPG boilers. |
| Grant
| Grant specialise in oil combi boilers and have been providing boilers to the UK market since 1970. Grant currently offers oil combi boilers across the Vortex Blue, Vortex Pro and Vortex Eco ranges. Grant’s oil combi boilers are available in outputs from 21kW to 35kW, feature stainless steel heat exchangers, market leading Riello Blue Flame burners, and come with up to a 10 year guarantee. Grant offers oil combi boilers. |
| Ideal
| Ideal has been providing boilers to the UK market since 1906. The current Ideal boiler offering comprises the Logic Max Combi, Vogue Max Combi, Vogue Gen2 Combi and Logic+ Combi ranges. Ideal combi boilers are available in outputs from 26kW to 40kW, feature aluminium heat exchangers, and come with up to a 12 year warranty. Ideal offers gas and LPG combi boilers. |
| Intergas
| Intergas are a Dutch boiler manufacturer who have been manufacturing boilers for over 50 years. The current combi boilers available from Intergas consists of the Xtreme, HRE, Xclusive, ECO RF and Rapid ranges. Intergas combi boilers are available in outputs from 17kW to 41kW, feature aluminium heat exchangers, and come with up to a 10 year warranty. Intergas offers gas and LPG combi boilers. |
| Navien
| Navien are a South Korean boiler manufacturer who were founded in 1978 and have been providing boilers to the UK market since 2014. Navien’s current combi boilers comprise the NCB and LCB700 ranges. Navien’s combi boilers are available in both oil and gas, come in outputs from 24kW to 40kW, feature stainless steel heat exchangers, and come with up to a 7 year warranty. Navien offers gas and oil combi boilers. |
| Vaillant
| Founded in Germany in 1874, Vaillant has been offering boilers to the UK market since the 1970s. Vaillant’s currently offers the ecoTEC exclusive, ecoTEC plus, ecoTEC plus combi store, ecoTEC pro and ecoFIT pure combi boiler ranges. Recipients of multiple Which? Best Buy awards, Vaillant combi boilers are available in outputs of 24kW to 43kW, feature a stainless steel heat exchanger, and come with up to a 7 year guarantee. |
| Viessmann
| Founded in Germany in 1917, Viessmann has been offering combi boilers to the UK market since 1989. Viessmann’s current combi boiler range comprises the Vitodens 050-W, Vitodens 100-W, Vitodens 111-W, Vitodens 200-W and the Vitodens 222-F. Recipients of multiple Which? Best Buy awards, Viessmann combi boilers are available in outputs from 26kW to 35kW, feature stainless steel Inox-Radial heat exchangers, and come with up to a 12 year warranty. Viessmann offers gas and LPG combi boilers. |
| Worcester Bosch
| Worcester Bosch was originally founded as Worcester in 1962, before becoming part of the Bosch Group in 1996 and becoming Worcester Bosch. Currently the UK market leader for domestic boilers, all of their combi boilers are assembled at their UK production facility in Worcester. Recipients of multiple Which? Best Buy awards, Worcester Bosch’s Lifestyle and Greenstar combi boiler ranges are available in outputs from 24kW to 50kW, feature aluminium heat exchangers, and come with up to a 12 year warranty. Worcester Bosch offers gas, LPG and oil combi boilers. |
Best-rated combi boiler brands 2021
Out of the list above, we have selected the best brands currently offering combi boilers in the UK. This list is in no particular order but has been put together based on the quality of the technology and components utilised, the warranty available, the availability of parts, the after-sales support provided, and the manufacturers’ reputation.
Viessmann
Viessmann is a premium boiler manufacturer offering the highest efficiency combi boilers available in the UK.
Our engineers love Viessmann combi boilers due to the quality of components utilised, notably the stainless steel heat exchanger used across every Viessmann combi boiler model. The quality of this Inox-Radial stainless steel heat exchanger enables Viessmann to stand out as one of the best combi boiler manufacturers due to the grade of stainless steel utilised. Only one grade below surgical steel, the stainless steel used makes these heat exchangers highly resistant to corrosion and enables the boilers to retain their efficiency across the appliance lifetime.
We also recommend Viessmann boilers highly due to the future proof smart technologies they utilise and the comprehensive warranty of up to 12 years that they offer.
Technology and components
- Stainless steel Inox-Radial heat exchangers
- Lambda Pro Control combustion controllers
- Brass parts and components
- Touchscreen LCD displays available on certain boilers
- Compatible with ViCare and tado° smart home technology
- Compatible with solar collectors and heat pumps
- Energy efficiency of up to 98%
Warranty
Up to a 12 year warranty available on Viessmann’s combi boiler range when installed by a Viessmann trained installer. Viessmann’s boiler warranties are comprehensive and cover both parts and labour. So that the warranty remains valid, Viessmann requires customers to register their boiler within 30 days of being installed, and ensure that it is serviced annually by a Viessmann Trained Installer or another Gas Safe Registered engineer.
The stainless steel heat exchanger utilised in Viessmann’s combi boiler ranges is covered separately and has a 10 year guarantee against leaks resulting from corrosion.
Availability of parts
Viessmann has a UK parts distribution centre in Telford and all combi boiler parts are now widely available in all Plumbase stores across the UK, as well as many other plumbing merchants online and in-store.
Reputation
Out of 1,837 reviews, Viessmann UK has a Trustscore of 4.5 and an excellent rating on Trustpilot.
Viessmann combi boilers have also been the recipients of multiple Which? Best Buy awards over the past five years.
Worcester Bosch
Worcester Bosch is the UK market leader in domestic boilers and has built up an excellent reputation over the last 50 years, becoming a household name in the UK. During this time, they have also received a Royal Warrant for supplying boilers to Her Majesty The Queen’s Sandringham Estate.
Technology and components
- Aluminium heat exchangers
- Plastic components
- Combi boiler options available for gas, oil and LPG
- Features the ability to be paired with Bosch EasyControl, which is compatible with Alexa and Google Assistant
- Energy efficiency of up to 98%
Warranty
Worcester Bosch’s combi boiler guarantee covers replacement parts, call out charges and labour costs for up to 12 years. This is subject to specific terms and conditions, including the following: the product must be purchased and installed within the UK or Ireland, it must be installed and commissioned in accordance with Worcester Bosch’s installation instructions, it should be registered within 30 days of installation, it should be serviced annually, it should only be used in a domestic or light commercial environment, and once installed, the boiler should not be moved.
Availability of parts
Worcester Bosch combi boiler parts are widely available in the UK from Screwfix, Plumbase and many other plumbing merchants both in-store and online.
Reputation
Out of 23631 reviews, Worcester Bosch has a Trustscore of 4.6 and is rated Excellent on Trustpilot.
Worcester Bosch combi boilers have been the recipient of multiple Which? Best Buy awards over the past few years.
Vaillant
Technology and components
- Stainless steel heat exchangers
- Compatible with solar collectors and heat pumps
- Features the ability to be paired with Vaillant’s vSmart smart thermostat app, which is compatible with Amazon Alexa
- Energy efficiency of up to 98%
Warranty
Vaillant offers a 7 year guarantee on its combi boiler range when the boiler is installed by a Vaillant Advance installer. The standard guarantee differs across its boiler ranges, this is 5 years for the ecoTEC exclusive with Green iQ and ecoTEC plus, and 2 years for the ecoTEC pro and ecoFIT pure boiler ranges.
Vaillant’s guarantee covers boiler component failures, material and labour charges.
To qualify for Vaillant’s guarantee, your boiler must be registered within 30 days of installation, installation and commissioning of the boiler must be carried out by a Gas Safe registered engineer, the boiler must be serviced annually by Vaillant or another Gas Safe registered engineer and the guarantee does not cover failures caused by contaminated water, or fair wear and tear.
Availability of parts
Vaillant combi boiler parts are widely available at Screwfix, Plumbase, and other plumbing merchants both in-store and online.
Reputation
Out of 14,328 reviews, Vaillant has a Trustscore of 4.6 and is rated Excellent on Trustpilot.
Vaillant was named as the UK’s top-scoring Gas Boiler Brand in the Which? Best Buy 2020 report.
Ideal Heating
Technology and components
- Brass system filters
- Touchscreen LCD displays available on certain boilers
- Quiet operation – with the Logic+ Combi being awarded the Quiet Mark Award
Warranty
Ideal offers up to a 10 year parts and labour warranty on its combi boiler range. In order to remain valid, this must be registered within 30 days of installation, the boiler must be installed and commissioned within 12 months of manufacture by a Gas Safe registered engineer, it must be serviced every 12 months by a Gas Safe registered engineer, and it must not be moved from its place of installation without consent from Ideal.
Availability of parts
Ideal combi boiler parts are widely available at Wolseley, Plumbase, and other plumbing merchants both in-store and online.
Reputation
Out of 6,525 reviews, Ideal Heating has a Trustscore of 4.7 and is rated Excellent on Trustpilot.
Ideal Heating combi boilers have also been endorsed by the Energy Saving Trust and have received Good Housekeeping Reader Recommended awards in 2020 and 2021.
Baxi
Technology and components
- Brass components
- Compatible with Baxi’s uSense smart control
- EasyFill technology makes it easy to top up the central heating system pressure without the need to call an engineer
Warranty
Baxi warranties differ across their different combi boiler ranges. The Baxi 200 range comes with a 3 year standard parts and labour warranty, the 400 range comes with a 5 year parts and labour warranty, the 600 range, 636 Combi LPG and Duo-tec Combi come with a 7 year parts and labour warranty, and the 800 range, the Platinum Combi and the Platinum+ come with a 10 year parts and labour warranty.
Baxi’s standard warranty covers the boiler and integrated controls and is subject to specific terms and conditions including the following: the boiler warranty must be registered within 30 days of installation, the boiler must be installed by a Gas Safe registered engineer, the boiler must be serviced every year by a Gas Safe registered engineer, and the warranty will become invalid if the boiler has been moved from its original place of installation.
Availability of parts
Baxi combi boiler parts are widely available at Wolseley, Plumbase, and other plumbing merchants both in-store and online.
Reputation
Out of 28,551 reviews, Baxi has a Trustscore of 4.5 and are rated Excellent on Trustpilot.
Ariston
Technology and components
- XtraTech™ stainless steel heat exchanger
- 1:7 modulation ratio
- Compatible with the Ariston NET smart app
Warranty
The warranty period differs across the Ariston range, with the E-Combi ONE LPG and E-Combi ONE coming with a 2 year warranty, the Clas ONE coming with a 8 year warranty, and the Alteas ONE NET and Genus ONE NET coming with a 12 year warranty.
Under Ariston’s warranty, Ariston will repair or replace a faulty boiler when the issue is a direct result of materials or workmanship from the manufacturer.
Ariston’s boilers must be registered within 30 days of installation to validate the warranty, they also must be installed in accordance with manufacturer’s instructions, be installed by a Gas Safe Registered engineer and must be serviced annually, to ensure the warranty remains valid.
Availability of parts
Ariston combi boiler parts are widely available at Direct Heating Supplies, PlumbNation, and Plumbase both in-store and online.
Reputation
Ariston combi boilers come Good Housekeeping Reader Recommended.
Our recommended combi boilers 2021
We have extensively reviewed the current combi boiler ranges of the above manufacturers and narrowed down these into a list of our recommended combi boilers available to buy in 2021. To produce this list, we have called upon the experience and expertise our team of engineers have gained over 40+ years, and we have considered the following factors:
- Price
- Warranty
- Design
- Material quality
- Flow rate
- Customer feedback
- Customer service
- Awards and accolades
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
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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 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
Read our detailed Ariston Clas ONE combi boiler review.
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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
Read our detailed Worcester Bosch Greenstar CDi Compact review.
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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
Read our detailed Worcester Bosch Greenstar i review
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
Read our detailed Worcester Bosch Greenstar 8000 Style review
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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
Read our detailed Vaillant ecoTEC Plus Combi review
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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
Read our detailed Vaillant ecoTEC exclusive with Green iQ Review
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
Read our detailed Vaillant ecoTEC plus Combination Store Boiler Review
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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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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 knows exactly what they’re doing in 2021.
Think you know which boiler you want? Get a quote by entering your postcode below!
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What is 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 is 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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