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Which is the Best 28kW Combi Boiler?

Becky Mckay
By: Becky Mckay
Updated: 8th January 2024

Best 28kW Combi Boiler

For smaller properties equipped with 1 bathroom and around 10 radiators, a 28kW boiler emerges as an ideal and cost-effective choice. In this guide, we present to you some top manufacturers and popular models to consider:

  • ATAG i28C
  • Baxi EcoBlue Advance
  • Heatline Capriz 2
  • Navien NCB
  • Potterton Titanium
  • Vaillant ecoTEC Pro
  • Worcester Bosch Greenstar 28CDi Compact

If you require a new 28kW combi boiler quickly but don't know where to begin, don't fret, we've got you covered.  Here at  Boiler Guide, we boast a vast network of certified heating engineers from all across the UK and can put you in touch with up to 3 heating engineers in your area. This way, you can effortlessly compare their quotes and swiftly choose the best offer for your household.

Our service is completely free and you're under no obligation to accept any of the quotes. Simply click the button below to get your free boiler quotes now and have your new combi boiler installed without delay.

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Is a 28 kW combi right for my home?

Before selecting a  28kW boiler that best fits your home, it's crucial to ensure that it will meet your energy needs. The best way to do so is by consulting a Gas Safe Registered engineer for their expert opinion.

How many radiators can a 28kw combi boiler run?

To provide you with a rough estimate,  a 28kW combi boiler would comfortably be able to meet the heating and hot water demands of a home with 1 bathroom and around 10 – 15 radiators. For larger homes, do not fret! We've also compiled the best 30kW and 40kW combi boilers for you to check out:

Best 28kW combi boilers in 2024

If your property is suited to accommodate a  28kW combi boiler, then your options are anything but limited. Below you'll find a table listing the best 28kW combi boilers, including some budget-friendly options, as well as more premium models.

Best 28kW Combi Boilers Seasonal Space Heating Efficiency ErP Rating Standard Warranty
ATAG i28C 94% A 10 years
Baxi EcoBlue Advance 89.1% A 10 years
Heatline Capriz 2 89.3% A 2 years
Navien NCB 93% A 7 years
Potterton Titanium 91.1% A 7 years
Vaillant ecoTEC Pro 94% A 2 years
Worcester Greenstar 28CDi Compact 92% A 5 years

ATAG i28C

ATAG places a high level of trust in the reliability and performance of their boilers, exemplified by their  10-year warranty as a standard for every purchase. As a testament to the impressive qualities of the ATAG i28C model, the extensive warranty package is followed by some great boiler features:

  • Compact size: Dimensions  of 700 x 440 x 355mm (HxWxD)
  • Impressive flow rate: About  11.5 litres per minute (at 35°C temperature rise)
  • Smart temperature control: Fitted with a  weather compensator that automatically changes temperature based on outside conditions  - further helping to lower energy bills
  • Lifetime guarantee: Contains  an iCon heat exchanger that  comes with a lifetime guarantee
  • Enhanced efficiency: When used alongside the ATAG ONE Zone controller, the ErP energy efficiency rating is increased from A to A+

The ATAC iC range of combi boilers is also available in outputs of 24kW, 36kW, and 40kW - making them a suitable option for properties of various sizes.

Baxi EcoBlue Advance

Introducing the Baxi EcoBlue Advance combi boiler range, renowned for its reliability and efficiency, and with a model to accommodate most household energy needs.  Here’s what the Baxi EcoBlue Advance combi boiler 28kW output model has to offer:

  • Ease of use: Renowned for their user-friendly  controls
  • High flow rate: Boasting up to  11.5 litres  per minute
  • Ease of installation: Designed for  straightforward installation, which will ultimately save you time and money
  • Environmentally friendly: Class 5 NOx rating which will help to make your home heating system more environmentally friendly.

Baxi EcoBlue Advance combi boilers are also available in output ratings of 24kW, 33kW, and 40kW.

Heatline Capriz 2

Heatline may not be the most widely recognised name amongst homeowners, but the manufacturer enjoys a solid reputation with installers for being an affordable and effective energy solution.

  • High hot water flow: Heatline boilers deliver  an impressive hot water flow rate of 11.4 liters  per minute
  • Enhanced speed: The boilers are fitted with a Grundfos pump, speeding up the delivery of hot water to your taps.
  • Winter resilience: Even in  freezing winter temperatures, the boiler operates efficiently thanks to a frost protection feature
  • Efficiency boost: The inclusion of an aluminium heat exchanger allows the boiler to run at highly efficient levels

The Heatline Capriz range only includes one other boiler which has an output rating of 24kW.

Already got your eye on a boiler for your home? Ensuring that you made the right choice goes further than the first pick. Customers often find themselves spending weeks on price comparisons and strenuous online research for a bargain. Here at Boiler Guide, we want to save you the headache by vetting installers for you!

Simply click the button below to begin, and we will deliver 3 free quotes to you from accredited Gas Safe Registered engineers, free of charge and obligations.

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Navien NCB

Navien NCB combi boilers are engineered for maximum efficiency, ensuring better savings on your energy bills. To achieve such efficient performance, Navien boilers have several features built-in as a standard:

  • Flexible flue lengths: To give you greater choice when it comes to deciding the location of your boiler
  • Premium materials: Constructed using stainless steel and brass components for increased efficiency
  • Energy efficiency: Through the fully modulating unit, energy waste is always kept to an absolute minimum
  • High flow rate: Delivers at 16.1 litres per minute (at 25°C temperature rise)

Combi boilers with output ratings of 24kW, 30kW, and 40kW are also available in the Navien NCB range.

Potterton Titanium

Potterton, a member of the Baxi Group, unsurprisingly offers a range of highly efficient Titanium boilers with an extensive 7-year warranty. Here are some features of their combi boiler 28kW model:

  • Flexible flue lengths: Flue options up to 20 metres give greater flexibility when it comes to finding a location for the boiler
  • High flow rate: Delivers hot water to taps at a high rate of 11.5 litres per minute
  • Recognised for excellence: Potterton Titanium boilers are endorsed  by the Energy Saving Trust

The Titanium range also includes more powerful 33kW and 40kW models as well as a smaller 24kW combi.

Vaillant ecoTEC Pro

Vaillant has consistently upheld its image as a trusted boiler manufacturer with some highly impressive options. While a 2-year standard warranty might fall short of its competitors, the option to extend it to 7 years is available when installing with a Vaillant Advance installer. Here are some key features:

  • High efficiency: Fitted with a low NOx burner and fan for increased efficiency
  • Winter resilience: Frost protection keeps the boiler running through freezing winter conditions
  • High flow rate: Switch on the ‘aquaCOMFORT’ mode to speed up delivery of the hot water to the taps
  • Energy conservative: Modulation range of 1:4 to ensure that only the necessary amount of energy needed at any one time is used
  • Less noise: Quiet Mark accreditation so you can be confident that you won’t be disturbed

Whether you need a lower or higher output than 28kW, the Vaillant ecoTEC range also includes outputs of 24kW and 30kW.

Worcester Bosch Greenstar 28CDi Compact

Worcester Bosch, a leading boiler manufacturer, is renowned for their Greenstar range of highly efficient and top-performing boilers. Amongst them, the CDi Compact range all have a central heating output rating of 24kW, while this particular model offers a 28kW output for domestic hot water.

  • Compact design: As the name suggests, this is designed to fit discreetly within a kitchen cupboard or similar spot, saving you plenty of space.
  • Ease of use: Often celebrated for its user-friendly  controls and easy-to-navigate display
  • Energy conservative: Electrical usage is kept at a minimum thanks to the  fitting  of  a low-energy pump
  • Frost protection: Helps  to prevent the boiler from freezing when installed in a garage or loft
  • High efficiency: Install the 28CDi alongside the Bosch EasyControl and it will achieve an ErP A+ rating for efficiency

The 28CDi is the least powerful model in the range, with more powerful 32kW and 36kW units also available.

28kW combi boiler prices: Costs in the UK

28kW combi boiler prices can vary based on several factors such as manufacturer, model, output size, and ease of installation. Typically, a new boiler costs around £1,000. Prices can fluctuate depending on the aforementioned factors, so consulting with a professional installer will give you the most accurate financial picture.

Best 28kW Combi Boilers Potential Cost (excluding installation)
ATAG i28C £1,050
Baxi EcoBlue Advance £1,228
Heatline Capriz 2 £560
Navien NCB £635
Potterton Titanium £959
Vaillant ecoTEC Pro £1,034
Worcester Bosch Greenstar 28CDi Compact £1,312

As well as the cost of the unit, 28kW combi boiler prices will also depend on the installation process. These costs will depend on the type and simplicity of the installation work involved and will vary from installer to installer. A typical combi boiler installation will cost around £500 to  £1,000.

To ensure that you're not overpaying for installation costs on your combi boiler, it's important to compare quotes from different heating engineers.  Typically, this can be a tedious and stressful task, as you have to spend hours researching individual installers and contact each installer one by one for a quote. Thankfully, our team at Boiler Guide can help make your life easier by taking care of the vetting for you.

We can provide you with up to 3 free quotes from qualified heating engineers available near you. This means you can easily compare the quotes side by side and ensure you're getting the most out of your money.

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Best 28kW off-grid combi boilers

If your property isn't connected to the gas network, you can't install a gas boiler. However, there is good news! Some of the best 28kW combi boilers are LPG compatible. LPG, short for Liquified Petroleum Gas, is a gas that is stored at the property, rather than being delivered through pipes on demand. Check out the table below to find  the best 28kW combi boilers that are LPG compatible in the table below:

Best 28kW Combi Boilers LPG Compatible?
ATAG i28C Yes
Baxi EcoBlue Advance No
Heatline Capriz 2 No
Navien NCB Yes
Potterton Titanium No
Vaillant ecoTEC Pro Yes
Viessmann 200-W Yes
Worcester Greenstar 28CDi Compact Yes

Alternatively, off-grid properties could have an oil boiler installed. The best 28kW combi boilers we’ve highlighted above are all gas boilers and won’t run on oil. However, the Worcester Bosch Greenstar Heatslave II could also be suitable for properties with 1 bathroom and around 10 radiators.

Combi Oil Boiler Output Rating Seasonal Space Heating Efficiency Rating Warranty Potential Cost (without installation)
Worcester Bosch Greenstar Heatslave II 32 kW 91% 2 Years £2,350

Get free boiler quotes today

To install a new combi boiler, you'll require a certified heating engineer to carry out the installation.  Here at  Boiler Guide, we have a nationwide network of certified heating engineers, allowing us to link you to experts in your area.

Getting started is easy, simply fill out our quick 30-second online form that details your home requirements and needs.  Soon after, you'll be provided with 3 free tailored quotes from certified installers in your area, giving you the freedom to choose the best bargain. Click the button below to begin!

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FAQ

What is the best 28kW combi boiler in the UK?

Luckily, there is no shortage of choice when it comes to popular 28kW combi boilers in the UK. Several manufacturers, such as ATAG, Worcester, or Vaillant, are applauded for the quality and efficiency of their 28kW boilers. For a more thorough breakdown of the top 28kW boilers in the UK, check out our comparison table.

How many radiators can a 28kW combi boiler run?

A typical 28kW electric combi boiler is capable of heating up to 10 – 15 radiators, making them a very suitable heating option for a medium-sized home.

Is a 28kW boiler big enough?

A 28kw combi boiler is an ideal choice for a medium-sized house of 2 to 3 bedrooms and a total of 10 to 15 radiators. For medium to larger homes with more bedrooms and radiators, a combi boiler with a higher output would be required.

What is the cheapest 28kw combi boiler?

From our breakdown of the most popular 28kW combi boilers in the UK, the Heatline Capriz 2 emerges as the cheapest option to purchase. Nevertheless, it is important to keep in mind that factors such as home conditions, installation difficulty, and the outgoing boiler system can all affect your overall installation costs.

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Becky Mckay

About the author

Becky Mckay

Becky has been a writer at Boiler Guide since 2021. Her vast boiler knowledge means she’s ready to help with any home heating query, big or small!

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