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Last updated: 3 November 2023

28kW Boilers – Everything You Need to Know

28kW boiler

There’s a lot to think about when it comes to choosing a new boiler for your home. One of the most important factors to consider is the output size. If you’ve stumbled across this article then you likely already know you need a 28kW boiler for your home. However, if you’re still not 100% sure that’s ok! Here is a guideline you can use to see which output size is likely suitable for your home:

No. of RadiatorsCombiSystemHeat-only
Up to 1024-27kW9-18kW9-18kW
Up to 1528-34kW18-26kW18-26kW
Up to 20 (and over)35-42kW27-40kW27-40kW

But as you can see from the table, output size isn’t the only factor you need to take into account when buying a new boiler. You also need to consider which type of boiler (combi, system, or heat-only) you’d like as well as the efficiency rating and warranty length.

That’s why it’s important to compare multiple 28kW boilers to make sure that you’re getting the one that best suits your needs. In this article we’ll talk you through what some of the available options are in the UK.

Another crucial element to compare when buying a new boiler is the price. However, researching and contacting installers one by one to try and figure out their rates can be a tedious and time-consuming task. Thankfully, GreenMatch can take this burden off your plate!

GreenMatch can quickly connect you with up to 3 qualified heating engineers near you from our vast network of UK vetted installers. This way you can easily compare their prices and avoid being ripped off. Our service is also completely free and non-binding. Click the button below to get your free quotes now and have your new 28kW boiler up and running in no time.

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28kW System Boilers

System boilers are usually a great choice for larger homes. This is because they work alongside a separate water cylinder and so can deliver greater volumes of hot water. In particular, a 28kW system boiler is typically best suited for a house with around 20 radiators.

Below we’ve listed some of the best system boiler options available in 28kW to help you start your decision-making journey.

1. Baxi Megaflo System 28kW Gas Boiler

Baxi is a UK-based company with a long history dating back to 1825, when it was founded by Richard Baxendale. This 28kW system boiler is a popular choice as it’s been designed with lowering your carbon emissions (and reducing your energy bills!) in mind.

The Baxi Megaflo system boiler is compatible with the Megaflo eco hot water cylinder as well as the solar cylinder. This means that it can help you save even more money on heating bills. The main unit also boasts user-friendly controls and comes with a choice of flue lengths for a flexible installation.This particular model is also available in 32kW if you think you might need something a little more powerful than a 28kW boiler, and in 24kW if you think a 28kW boiler might be a little bit excessive for your needs.

  • Efficiency: 92%
  • Liquefied Petroleum Gas (LPG) Compatible: No
  • Central Heating Output: 28kW
  • Warranty: 7 years
  • Estimated price (excl. installation): £852

2. Viessmann Vitorondens 200-T 28kW System Oil Boiler

Viessmann is a German company with multiple offices around the world who strive to deliver quality products. If you want the best system boiler for a large house with 2 or more bathrooms then this 28kW system boiler is likely a good choice for you. However, if you think your heating and hot water needs require more then there’s also a 35kW and a 42kW model available.

The Vitorondens 200-T 28kW comes with a Eutectoplex heating surface, which extends the boiler service life. It also boasts a corrosion-resistant stainless steel heat exchanger and a low jetflow system for optimum heating water distribution. The unit can be connected to the internet through the vitoconnect accessory for operation and service.

  • Efficiency: 97%
  • LPG Compatible: No
  • Central Heating Output: 28.9kW
  • Warranty: 7 years
  • Estimated price (excl. installation): £7,179.60 – £7,410.00

3. Ariston Clas System One 28kW Gas Boiler

Ariston is another leading company in producing heating systems. Its company values include focusing on integrity and excellence, as well as sustainability and customer satisfaction. This 28kW boiler is a great option, however, if you’re having doubts about whether it’s suitable or not for the size of your home then there are less powerful models available for smaller homes.

The Clas System One 28kW boiler runs quietly thanks to its built-in soundproofing technology. Additionally, it has been tested by TUV Rheinland for safety, quality and usability.  

  • Efficiency: 94%
  • LPG Compatible: Yes
  • Central Heating Output: 28kW
  • Warranty: 8 years
  • Estimated price (excl. installation): £1,000

As you can see from the above models, the price of a new boiler can vary a lot. This is also the case for installation costs. Many people unknowingly overspend on this, not realising that there may have been a fairer deal available. That’s why it’s so important for you to compare quotes from multiple installation companies.

At GreenMatch, we can provide you with up to 3 free quotes from qualified boiler installers in your area. This means you can compare them side by side and objectively choose the best deal. What’s more, you’re not obliged to accept any of the offers, so you’ve got nothing to lose. Simply click the button below to get started.

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28kW Combi Boilers

A combi boiler is a lot more compact compared to a system or heat-only boiler as it doesn’t require installing any extra components such as a hot water cylinder. A combi boiler is also able to provide hot water on demand. These two reasons play a significant part in why it is the most popular type of boiler in the UK.

Combi boilers generally have smaller output sizes compared to other types of boilers, meaning they are usually best suited for small- and medium-sized homes. A 28kW combi boiler is usually recommended for homes with up to 15 radiators.

Below we’ve put together a list that includes the best combi boiler of 2024 in the UK in 28kW:

1. Baxi Duo-tec Combi 28kW Gas Boiler

Another great boiler from Baxi is the Duo-tec 28kW combi boiler. Like all of the boilers on this list, Baxi provides modern condensing technology so you can feel assured that your boiler will work to a highly efficient standard

If you have a single bathroom and 10-15 radiators then the 28kW model should serve you well, however, it is also available in 24kW, 33kW, and 40kW if you feel another size would be more fitting to your circumstances.

  • Efficiency: 92%
  • LPG Compatible: No
  • Central Heating Output: 25.9kW
  • Domestic Hot Water Output: 28kW
  • Warranty: 7 years
  • Estimated price (excl. installation): £812

2. Worcester Bosch Greenstar 28CDi Compact Combi Gas Boiler (28kW)

Worcester Bosch is continuously rated as one of the best boiler manufacturers and its Greenstar range in particular is well renowned. All Greenstar CDi Compact combi boilers come with a central heating output of 24kW, however, the domestic hot water output is also available in 32kW and 36KW as well as this 28kW model.

Features of this boiler include a user-friendly display, frost protection, and a low-energy pump to help reduce your energy consumption.

  • Efficiency: 94%
  • LPG Compatible: Yes
  • Central Heating Output: 24kW
  • Domestic Hot Water Output: 28kW
  • Warranty: Up to 10 years
  • Estimated price (excl. installation): £1,000

3. Vaillant ecoTEC Pro 28kW Combi Gas Boiler

Vaillant is a well-established boiler manufacturer with production sites across the world. It takes sustainable development seriously with the implementation of its S.E.E.D.S strategy (Sustainability in Environment, Employees, Developments and products, and Society).

The ecoTEC Pro 28kW combi gas boiler is highly efficient and has frost protection to ensure it performs to a high standard all year round. This model is also available in central heating output sizes from 24.8kW to 25.9kW and domestic hot water outputs from 23.4kW to 30kW, if you’re not 100% sure about committing to a 28kW boiler.

  • Efficiency: 94%
  • LPG Compatible: Yes
  • Central Heating Output: 25.9kW
  • Domestic Hot Water Output: 27.2kW
  • Warranty: 10 years
  • Estimated price (excl. installation): £1,119

As combi boilers are the most popular type of boiler in the UK this means there are a lot of models to choose from. This can be overwhelming even if you have an idea of what to look for. With technical jargon and seemingly small differences between boilers it can be difficult to know what to choose for your home.

GreenMatch can help take some of this weight off your shoulders. We can put you in touch with up to 3 qualified boiler installers, this way you won’t have to spend hours upon hours researching and you’ll have someone you can trust with all your boiler-related questions.

To get started and receive quotes from local installers simply click the button below. And don’t worry about any hidden fees or obligations! Our service is completely free of charge and you’re not required to accept any of the offers you receive.

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28kW Heat-Only Boilers

A heat-only boiler, which you also may know as a regular or conventional boiler, is the traditional boiler heating system in the UK. Heat-only boilers tend to take up the most space out of the 3 types mentioned in this article, as they require both a water tank (typically found in the attic) and a hot water cylinder (typically found in an airing cupboard).

Heat-only boilers typically aren’t recommended by heating engineers, as it usually only makes sense to install one under specific circumstances. For example, if you’re replacing an old heat-only boiler.

If you think a heat-only boiler is the best fit for your home then you can check out this selection of some of the top conventional boilers to give you a better idea of what 28kW options are out there:

1. Navien LCB700 28kW Internal Regular Oil Boiler

Navien started operating in the UK in 2014. Even though it is relatively new to the UK market, this doesn’t mean it’s an inexperienced company. It is one of the world’s best-selling boiler brands, dominating in the USA, Russia, and South Korea.

This 28kW boiler comes with smart controls, including a smart forecast check which enables the boiler to heat your home in relation to the weather outside. It also has a zone control which allows you to control the temperature in 3 different areas of your home separately. Both of these features can help you reduce your heating bills significantly.

There is also an external version of this model available.

  • Efficiency: 93%
  • LPG Compatible: No
  • Central Heating Output: 28kW
  • Warranty: 10 years
  • Estimated price (excl. installation): £N/A

2. Worcester Bosch Greenstar 27Ri Regular Gas Boiler

This is another great boiler from Worcester’s Greenstar range. This particular model is slightly smaller than a 28kW boiler, but it will likely still be sufficient for your heating and hot water needs. If you do feel you might need something with a bit more power then this model is also available in 30kW.

One of the standout features of this boiler is that it is compatible with Bosch’s Greenskies solar panels, so you can reduce your carbon footprint and have a more environmentally-friendly home.

  • Efficiency: 92%
  • LPG Compatible: Yes
  • Central Heating Output: 27kW
  • Warranty: Up to 10 years
  • Estimated price (excl. installation): £1,114

3. Intergas Compact HRE OV Regular Gas Boiler

Intergas prides itself on manufacturing energy efficient boilers which are built to last. This particular model has a constantly modulating fan which automatically adjusts the boiler’s capacity to fit your home’s heating and hot water requirements. This means less valuable energy will be wasted, helping you to save money on your energy bills.

The Compact HRE OV is slightly smaller than a 28kW boiler, however, it should still be sufficient if you have a medium- or larger-sized house with up to about 20 radiators.

  • Efficiency: 93%
  • LPG Compatible: Yes
  • Central Heating Output: 27kW
  • Warranty: 7 years
  • Estimated price (excl. installation): £945

As you can see from this article, there are a lot of options out there when it comes to finding a boiler replacement & installation! In addition to that, there are also numerous boiler installers to choose from… Spending hours upon hours researching and then trying to make a final decision can be overwhelming and long-winded, to say the least.

However, there is an easier way to do things with GreenMatch. We can quickly put you in contact with installers in your area and then you can objectively choose the best offer from them. What’s more, our service is completely free and comes with no obligations. Click the button below to receive up to 3 free quotes from qualified heating engineers near you.

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FAQ

Bronte McClelland
Written by Bronte McClelland, Writer

Brontë is an experienced writer and editor for GreenMatch. Her passion for sustainability and renewable energy drives her to stay at the forefront of green-energy trends.

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