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Last updated: 6 November 2023

24kW Boilers – Everything You Need to Know

24 kw boiler

So you know you need a 24kW boiler for your home, but maybe you’re not sure about the boiler type or which brands offer efficient 24kW boilers – thankfully, you’ve come to the right place! In this article, we’ll talk you through your options for each type of boiler to help give you a head start on your decision-making journey.

But before we get into it, it’s first good to clarify if a 24kW boiler is a good fit for your home. Checking the number of radiators you have in your home is usually a good indicator of what size of boiler you’ll need. Furthermore, if you have high heating and hot water demands, such as your household using multiple bathrooms at the same time, then you might need to opt for a system or heat-only boiler rather than a combi. The table below is a rough guideline:

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

It’s important to reiterate that this table is only a guideline and it’s always best to check with a professional heating engineer which output size you need based on your own circumstances, such as the number of bathrooms you have. On top of that, it’s actually a good idea to talk to multiple heating engineers.

Why is this a good idea?

Because this way you can compare installation costs to make sure you get the best deal for your boiler. At GreenMatch, we can provide you with up to 3 free quotes from boiler installers in your area so you can objectively compare them and choose the best offer.

If you already have an idea of what you’re looking for and want to compare offers as quickly as possible, simply click the button below to get started. Or if you want to get a better overview of what boiler models are out there then keep on reading!

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24kW System Boilers

System boilers are some of the best boilers for large houses, with multiple bathrooms, as they work in conjunction with a hot water storage cylinder (this is what you typically find in an airing cupboard) to help meet high hot water demands.

We’ve put together a shortlist of some of the top system boilers available in 24kW below, to give you an idea of what’s currently on the UK market.

1. Worcester Bosch Greenstar 4000 24kW System Gas Boiler

Worcester Bosch is one of the most highly respected boiler manufacturers in the world and its Greenstar range is well-renowned as it has won the “Which? Best Buy” award multiple times. So you know you’re in safe hands if you decide to install this boiler in your home.

This model features wireless connectivity with the Bosch EasyControl, making it easy for you to manage your energy consumption. Also, if you’re looking to make your heating system more environmentally friendly, then you can combine this model with Bosch’s Greenskies solar panels.

For those whose homes aren’t connected to the gas grid, there is also an LPG (liquefied petroleum gas) model available.

    • Efficiency: 94%
    • LPG Compatible: LPG model available
    • Central Heating Output: 24kW
    • Warranty: Up to 10 years
    • Estimated price (excl. installation): £1,100 (inc. VAT)

2. Ideal Logic Max S24 (24kW) System Gas Boiler

Ideal offers a range of top boilers and its Logic Max system boiler is no exception. The key features of this model include a large digital display and user-friendly controls. It also comes with frost protection so you can feel assured that your boiler will work efficiently all year round.

If you’re not sure whether the 24kW model is the right fit for your home, there are also 15kW, 18kW and 30kW output options available for this specific model, so you’re likely to find one that suits your needs.

    • Efficiency: 94%
    • LPG Compatible: No
    • Central Heating Output: 24.2kW
    • Warranty: 10 years
    • Estimated price (excl. installation): £1,049 (inc. VAT)

3. Viessmann Vitorondens 200-T 24kW System Oil Boiler

If you don’t have access to the gas grid and are looking for an oil-fueled boiler then the Vitorondens 200-T 24kW system boiler from Viessmann is a great choice. It is designed to help you save time and money on installation due to its pre-fitted control unit and thermal insulation. This model is also easy to control as you can connect it to wifi through the Vitoconnect accessory.

If you’re not sure whether you might need a little less or more power than a 24kW boiler can offer, then this model is also available in 20kW, 28kW, 35kW, 42kW and 53kW so you’re sure to find something suitable for your home’s needs.

    • Efficiency: 97%
    • LPG Compatible: No
    • Central Heating Output: 24.6kW
    • Warranty: 7 years
    • Estimated price (excl. installation): £7,229 (inc. VAT)

As you can see, there are many reliable and highly efficient 24kW system boiler options to choose from. However, what may influence your decision when it comes to choosing a model are the installation costs. Installation costs can vary massively depending on factors such as the installers rates and whether or not you’re getting a like-for-like boiler replacement & installation.

Finding the best deals can be hard as there are so many different installation companies out there to compare. Researching which companies are best could potentially take up hours of your valuable time. Thankfully, however, with GreenMatch there is an easier way to do it – where you can save both time and money.

We can quickly connect you with up to 3 qualified heating engineers near you from our network of vetted boiler installers. You can then easily compare their offers and choose the best deal. And don’t worry – our service is completely free and non-binding, so you have nothing to lose. Click the button below to get your free quotes now and have your new 24kW boiler installed in no time.

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24kW Combi Boilers

Combi boilers are the most popular type of boiler in the UK, and for good reason: they’re compact and can provide hot water on demand. As well as being a compact unit, combi boilers don’t require any additional tanks or cylinders, making them perfect for smaller homes.

Below we’ve listed some of the best combi boilers of 2023 in the UK available in 24kW that you should look out for:

1. Ariston GENUS ONE NET 24kW Combi Gas Boiler

Ariston is part of the Ariston Thermo Group, which is a global brand with nearly 100 years of experience behind it. The GENUS ONE NET is one of its top boilers and has been designed with easy installation in mind: it’s lightweight, has frontal access to all components, and has colour coded parts. This means having your boiler installed and serviced should be a breeze.

This model comes with a lot of great features, one of the most unique being that it has an optional full zone management kit. You can manage up to 7 separate heating zones in your home, meaning that you can have each zone at the perfect temperature depending on your needs and how much time you spend there; this will also help you to reduce your energy bills.

    • Efficiency: 94%
    • LPG Compatible: Yes
    • Central Heating Output: 22kW
    • Domestic Hot Water Output: 26kW
    • Warranty: 12 years
    • Estimated price (excl. installation): £1,700 (inc. VAT)

2. Ideal Logic Plus C24 (24kW) Combi Gas Boiler

Another great boiler from Ideal is its Logic Plus combi boiler. In this range, all 3 combi boilers come with the same central heating output size of 24.2kW, however, each one comes with a different domestic hot water output. If you have multiple people in your household and require a lot of hot water on a regular basis then the C30 or C35 models might be a better fit.

Some notable features of this 24kW combi boiler include a preheat function and a large backlit display. It also has frost protection, which ensures that your boiler is able to function at optimum levels no matter the weather.

    • Efficiency: 94%
    • LPG Compatible: No
    • Central Heating Output: 24.2kW
    • Domestic Hot Water Output: 24.2kW
    • Warranty: 7 years
    • Estimated price (excl. installation): £847 (inc. VAT)

3. Vaillant ecoTEC Pro 24kW Combi Gas boiler

Vaillant is a global boiler manufacturing company with a focus on sustainable development. It has implemented its own strategy called S.E.E.D.S (Sustainability in Environment, Employees, Developments and products, and Society) to ensure that it stays on track with its sustainability targets.

This 24kW combi boiler comes with Vaillant’s aquaCOMFORT warm start feature (a preheat function), frost protection, and has been Quiet Mark approved. This particular model is also available in 2 other sizes: 28kW and 30kW. The latter being a good choice if you have 2 bathrooms.

    • Efficiency: 94%
    • LPG Compatible: No
    • Central Heating Output: 24.8kW
    • Domestic Hot Water Output: 23.4kW
    • Warranty: 10 years
    • Estimated price (excl. installation): £1,015 (inc. VAT)

Considering combi boilers are the most popular type of boiler in the UK, it’s no surprise that there are an abundance of models to choose from. This means there’s likely to be a boiler that fits your needs perfectly, however, this also means that the sheer amount of choice can be overwhelming.

At GreenMatch, we can help ease this burden and make your decision-making process much simpler. We can put you in touch with up to 3 qualified boiler installers, so you won’t have to spend precious hours trawling the internet looking for reputable companies with good reviews, and you’ll have an expert you can rely on in no time.

To get started and receive free quotes from installers in your area simply click the button below:

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24kW Heat-Only Boilers

A heat-only boiler, also known as a regular or conventional boiler, is the type of heating system you’ll likely find in older British homes (built pre-1970s). This boiler type typically isn’t recommended for modern homes by heating engineers, partially due to the extra components required (such as a cold water tank and a hot water cylinder).

However, with that being said, newer models are still being manufactured as modern, efficient and convenient replacements for those with an existing heat-only setup. We’ve compiled a list of some of the top heat-only boilers below:

1. Biasi Advance OV 24kW Heat-Only Gas Boiler

Biasi prides itself on providing reliable, user-friendly and high-performing boilers at affordable prices. The Advance OV has been made with efficiency and reliability in mind.

This 24kW boiler comes with built-in weather compensation which, alongside an optional temperature probe, can automatically react to the weather outside, ensuring that you don’t freeze or waste money.

If you’re not sure whether you need the full power of the 24kW model, there are also 15kW and 18kW options available.

    • Efficiency: 92%
    • LPG Compatible: Yes
    • Central Heating Output: 24.4kW
    • Warranty: 5 years
    • Estimated price (excl. installation): £625 (incl. VAT)

2. ​​Baxi 424 Heat 24kW Heat-Only Gas Boiler

Baxi is one of the top UK boiler manufacturers. It is also known for manufacturing some of the most lightweight boilers available on the market at 19.5kg; .including the 424 Heat model. These lightweight boilers mean that the installation process should go much more quickly and smoothly.

If you have up to 15 radiators in your home then this 24kW boiler is likely a good fit. However, if you have about 10 radiators or less in your home then there are also 12kW, 15kW and 18kW options available. Likewise, if you have an extra bathroom in your home and need some more power then there is also a 30kW model.

    • Efficiency: 93%
    • LPG compatible: No
    • Central Heating Output: 24kW
    • Warranty: 5 years
    • Estimated price (excl. installation): £754 (incl. VAT)

3. Worcester Bosch Greenstar 24Ri (24kW) Heat-Only Gas Boiler

Considering the Greenstar boiler range has received the “Which? Best Buy” award for 11 consecutive years, we decided to include another model from it on our list: the Greenstar 24Ri.

This model is also built with the environment in mind, as it is compatible with Worcester Bosch Greenskies solar panels and is able to run on a 20% hydrogen blend (which means you’ll be ready if the national grid switches from 100% natural gas to a hydrogen blend in the future).

If you’re having doubts about whether the 24kW boiler is right for you, don’t worry, as this model is also available in smaller output sizes from 9kW to 21kW, as well as more powerful 27kW and 30kW outputs.

    • Efficiency: 92%
    • LPG compatible: Yes
    • Central Heating Output: 24kW
    • Warranty: Up to 10 years
    • Estimated price (excl. installation): £954 (incl. VAT)

As already mentioned, heat-only boilers aren’t recommended by heating engineers, unless it’s a like-for-like replacement. This is why it’s important to talk to a professional before replacing your boiler to ensure that you’re not wasting thousands of pounds installing the wrong type of boiler for your home.

By clicking the button below we can put you in touch with up to 3 qualified boiler installers who can help you find the perfect boiler for your home, as well as offer you the best deals. And don’t worry about any hidden fees or obligations! Our service is completely free and you’re not required to accept any of the offers you receive.

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24kW Electric Boilers

Electric boilers can be a great option when used alongside a green energy provider or your own solar panels in the UK. However, 24kW electric boiler models, and other larger output sizes, are not commonly available. This means electric boilers are generally best suited for smaller homes.

With that being said, the Electric Heating Company does offer their Astro electric combi boiler in the UK as a 24kW model. Some benefits of this boiler include:

    • 100% efficiency
    • Can be used for underfloor heating
    • Minimal maintenance required
    • Quiet when operating

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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