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Keston Boilers: Prices, Review and Boiler Ranges

Keston Boilers: A Complete Guide to their Prices, Reviews, Warranties And a Lot More

Keston is a British boiler brand and manufactures all of its combi, system and heat-only boilers in Hull. Boasting an energy efficiency of 89.6% a 7-year warranty and affordable prices ranging from £1,190 to £1,300, Keston could be a good option for medium-sized and large homes.

The brand offers a small selection of boilers compared to other major boiler manufacturers but the team believes there is a Keston for most homes across the UK. Its boilers come with an admirable performance output of 30kW or 35kW which can heat home with up to five bedrooms, multiple bathrooms and 15 radiators. 

Plus, each Keston boiler is quality control checked to ensure every product is produced to the highest standard and offers the owner complete peace of mind. 

However, are Keston boilers the real deal and as good as the brand and its network of boiler suppliers make out? 

Read on to find more. We’ve been digging up the dirt. 

Aim of the content of this article?

The content Boiler Prices publishes on this website explains the details, specs and brands UK homeowners should consider when purchasing the best boiler for their home at the best price. We intend to help you make the right choice for your home and put you in touch with local suppliers and installers to ensure you get the best price for your boiler. 

To bring you a comprehensive round-up, we research the UK boilers market down to its depths. Scratching below the surface of brand websites and their affiliated suppliers, we report what consumers have to say — and expose the misleading advertorials that paint poor-quality boilers as good purchases. 

The information we provide — together with “our verdict” — is also based on the views and experiences of frontline professionals in the energy consumer industry. Ultimately, the information we provide on this page will help you to determine whether a Keston boiler is the right choice for your home.

By the time you finish reading this page, you will know:

  • The different types of energy-efficient boilers Keston manufactures so that you can decide which type of boiler serves your heating and hot water needs
  • How many kW do you need to comfortably heat your home and meet your real-time hot water demands
  • The cost, models and efficiency of Keston boilers 
  • The boiler specifications and dimensions that can be installed in your home (which type of boiler is best for you)
  • Boiler comparisons that fall into the same price point and star rating as Keston so you can broaden your search easily

Keston: A Trusted Name in Boilers

Keston Boilers has a storied history rooted in innovation and commitment to quality heating solutions. Founded in the late 1980s in Hull, the company quickly established itself as a leading manufacturer of high-efficiency boilers, specialising in the design and production of innovative heating solutions.

The company became known for its pioneering approach to boiler technology, introducing advanced features and functionalities to enhance performance and efficiency. One of the company’s notable innovations was the development of the Keston Heat Engine, a unique heat exchanger design that optimised heat transfer and energy efficiency.

In 2000, Keston Boilers was acquired by Ideal Boilers, a leading manufacturer of heating solutions in the UK. The acquisition provided Keston Boilers with access to greater resources and expertise, further strengthening its position in the market.

Under Ideals’’ ownership, Keston continued to innovate and develop new technologies to meet the evolving needs of customers. The company introduced a range of high-efficiency boilers with advanced features such as modulating burners, digital controls, and in-built frost detection.

Considerations when buying a Keston Boiler

Despite being competitively priced, it’s essential to evaluate whether Keston boilers justify their cost and offer excellent value for money. For those contemplating the purchase of a Keston energy-efficient wall-mounted boiler, it’s prudent to consider the following factors.


New boilers are awarded an efficiency rating, indicating the percentage of fuel converted into usable energy. Boilers with a high-efficiency rating are awarded an A rating due to their ability to consume less fuel than legacy boilers. Keston combi boilers, for instance, deliver a seasonal efficiency rating of 89.6% which is below the UK average and the government’s recommended target of 92%.


Keston boilers boast compact designs, rendering them ideal for installation in constrained areas like kitchens or utility cupboards. Whether opting for the combi or system range, Keston boilers cater to residences of all sizes. However, heat-only boilers, or regular boilers, may not be suitable for spaces with limited room, as they require additional storage for a cylinder and cold water tank. Despite this, they prove more dependable for properties with greater heating and hot water requirements.

Performance Output in kW

The performance output of a boiler is quantified in kilowatts (kW), denoting the amount of heat it can generate and directly influencing its heating capacity. This parameter is crucial in ensuring that the boiler adequately heats your property.

Insufficient kW output may result in the boiler struggling to fulfil heating requirements, particularly in colder seasons. The size of your property plays a pivotal role in determining the suitable kW rating. Larger residences with more rooms and increased heat loss, attributable to factors like poor insulation or expansive windows, necessitate a higher kW output to maintain optimal temperatures.

To ascertain the appropriate boiler capable of meeting your heating and hot water needs, it’s advisable to seek guidance from a qualified and knowledgeable engineer. Utilizing our “get a quote” function allows you to consult with experts at no cost, providing valuable insights without any obligation to purchase.

Ease and Cost of Installation

The accessibility of the installation site and complexities in fitting a particular boiler site can impact labour costs. According to gas-safe engineers,  Keston is one of the easiest to fit and components are readily available in the UK. 

This all means that installation costs, servicing and maintenance tasks are less likely to be stacked up by labour charges. The cost of professional gas-safe installers should be factored into the cost of your new boilers — and bear in mind installation costs are never included in the price shown for the boiler. 

To get the best price, you need to shop around and get quotes from local and national boiler installers. When obtaining quotes, be sure to ask for a price on the boiler and installation. Average fitting costs for Keston boilers are between £1,500 and £1,800, but you might be able to save some money by comparing prices from different installers. 

Take advantage of our free ‘get a quote’ tool for no obligation to buy quotes from boiler suppliers in your local area. 

Also, you must make sure your engineer is registered to fit your new boiler. All gas boilers must be installed by Gas Safe registered engineers to ensure the work is completed not only safely but also legally.

Get your free quote now by clicking the link and filling out the question form.


The length of the warranty is a vote of confidence from the manufacturer. Warranties typically range between 1-10 years, with many brands only offering two or five years in the same price bracket as Keston. The Hull outfit offers a lengthy 7-year warranty, giving consumers more peace of mind.

However, it should be noted that the 7-year warranty is only valid if the boiler is fitted by a qualified Keston engineer and the documents are registered within 30 days of installation. Otherwise, parts and labour are only covered for five years as standard.

Keston Combi Boilers: Compact, Efficient, and Cost-Saving

Combi boilers integrate both heating and hot water functions into a single unit, eliminating the need for separate cylinders or tanks. This space-saving design is particularly advantageous for UK homes with limited space, such as apartments and smaller houses.

This type of boiler also heats water directly from the main supply, delivering hot water on demand whenever needed. This means there’s no waiting time for hot water to be heated in a cylinder, offering convenience and efficiency.

Keston has two combi boiler sizes available, including the C30 with a 30kW output and the C35 with a 35kW output. Typical Keston combi boiler prices range from £1,190 to £1,300, with the C35 costing more than the C30.

The C35 delivers a performance output of 35kW which will heat larger homes of up to five bedrooms and two bathrooms. The 30kW should comfortably heat homes with three bedrooms and up to 10 radiators.

Keston’s combi boiler range is made up of only A-rated solutions that can be converted to LPG for homes that do not have access to the gas grid. Options include:

Note: the prices listed below are the purchase prices for the boiler only. They do not include installation costs.

Keston C30 Combi30kWMedium-sized homes£1,190
Keston C35 Combi35kWLarge-sized homes£1,300

Keston System Boilers Price Range – Good for Homes with Multiple Bathrooms

As Keston system boilers require a separate hot water cylinder, they’re a great choice for medium to large properties with more than one bathroom. They don’t, however, need to be installed with loft tanks, making them a good option also for homes without any spare loft space.

Put simply, system boilers are generally more suitable for dwellings with high heating and hot water demands. Keston currently has one system boiler available, otherwise known as the Keston System S30 with a 30kW output and price tag of around £1,090.

The Keston S30 system boilers can meet higher demands of hot water than most combi boilers of comparable output. It is compatible with homes boasting up to 15 radiators and two bathrooms.

Note: the prices listed below are the purchase prices for the boiler only. They do not include installation costs.

Keston System S3030kWMedium and large homes with more than one bathroom£1,090

Keston Heat Boilers Price Range – Perfect for Large Homes & Light Commercial Properties

Keston heat boilers require water tanks in the loft and a separate cylinder for storing hot water. The Keston heat range is suitable for larger homes and a variety of commercial installations, and up to 6 of these boilers can be installed in a cascade to produce an output of up to 330kW.

There are two heat output options available, including 45kW and 55kW to suit different needs and demands. Prices range from £2,350 to £2,700, depending on the size of the boiler.

Considering a regular boiler is only advisable if your current heating system is compatible with this type. Regular boilers are integral components of complex heating systems comprising multiple parts. Keston’s regular boilers are robust units designed for larger homes with approximately 20 radiators and multiple bathrooms, boasting an extensive 7-year warranty.

Keston Boiler Quotes

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Note: the prices listed below are the purchase prices for the boiler only. They do not include installation costs.

Keston Heat 4545kWLarge-sized homes and light commercial buildings with multiple bathrooms£2,350
Keston Heat 5555kWLarge-sized homes and light commercial buildings with multiple bathrooms£2,700
Keston Boiler Quotes

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Living with your Keston boiler

Keston Boiler Warranties

Your newly installed Keston boiler will come with a 5-year warranty as standard to give you peace of mind that you won’t have to pay for repairs if the boiler breaks down. 

If the boilers are installed by a certified Keston Gas Safe engineer, and the warranty is registered through the Keston website within 30 days of installation, you will be entitled to a 7-year warranty. 

You also need to be aware of the warranty terms and conditions, which must be met by you to keep the warranty valid. For more information on what is covered, the length of the warranty, the terms and conditions and how to register your warranty, you can read our expert guide to the Keston Boiler Warranty

Keston Boiler Controls

When you choose the right boiler controls for your heating and hot water system, you can increase comfort levels, minimise energy consumption and cut the cost of your energy bills. 

And if you own or are about to purchase a Keston boiler, you’ll be pleased to learn that Keston has created a small selection of boiler controls to suit your needs and lifestyle. 

Keston’s boiler controls also make it easier for you to control your system and manage your heating ‘on’ and ‘off’ periods.  If you would like to find out more about the different types of controls available, check out our helpful guide to Keston Boiler Controls

Keston Boiler Cover and Breakdown Options

Your Keston boiler can develop a fault and break down at any time, but the majority of problems tend to occur at the beginning of winter. If it’s a simple fix you should be able to put things right yourself, provided it is safe and you feel confident to do so. 

When it comes to serious boiler issues and those that can only be rectified by removing the boiler casing, these must be dealt with by a Gas Safe registered engineer. As some Keston boiler issues are more common than others, we’ve created a guide that explains the most common Keston Boiler Problems and Repairs and what you need to do next when each of them occurs. 

There’s never a convenient time to experience issues with your Keston boiler but chances are high that a fault will occur with your boiler at some point.

When a fault develops with your Keston boiler, it will enter a lock-out mode and a fault code will appear on your boiler’s control panel. The fault codes should help your engineer identify problems and work out what needs to be done to get your boiler working again. 

Some Keston boiler fault codes can be cleared by simply resetting the boiler but the majority of fault code-related problems will need to be resolved by a Gas Safe registered engineer. If your Keston boiler is showing a fault code and you’re trying to find out what the code means, you can refer to the table in our handy guide to Keston Boiler Errors and Fault Codes.  

Keston Boiler Surveys and Reviews

One of the best ways to get a good feel for a boiler brand and its products is to analyse customer reviews on trusted consumer review sites such as Trustpilot.

Having looked on Trustpilot, it appears that some Keston boiler owners are not happy with their purchase. Keston Boilers is currently rated ‘poor’ and at the time of writing (April 2024) only has a rating of 2.4 from a total of 5.

What’s more, there are only a few good reviews and they are mainly from customers that left a review not long after installing a Keston boiler. Of the 35 customers that have left a review, 68% only left one star and said, the quality of the boilers leaves a lot to be desired. 

Having said that, the reviews are sporadic and limited. With just 35 reviews over four years, the company is not proactive in encouraging its customers to leave reviews. That may be because they are concerned about bad reviews, or because they do not have a large customer service team that can manage online marketing strategies. 

Feedback on Keston boilers tells a similar story on Review Centre. From 43 reviews, 39 are complaints about their Keston boiler breaking down regularly. 

So, before purchasing a Keston boiler, it might be worth looking at its Trustpilot page and any other reputable consumer sites you can find before you decide to purchase a Keston boiler. 

How do Keston boilers compare with other boiler brands?

At the surface level, Keston easily matches rival boiler brands. They offer an industry-standard five-year warranty which can be extended to seven years, have been awarded A-rated seasonal efficiency and offer 30kW and 35kW performance output for under £1400. 

On paper, all these metrics compare and compete with leading boiler brands including Keston’s parent company Ideal. They can also beat some of the low-end models offered by Baxi, Glow-worm and Viessmann that only offer two or five-year warranties depending on the model.

However, there is a huge question mark over whether Keston’s boilers are more reliable than the less expensive models offered by these other brands. You could purchase a boiler for half the price that is just as reliable. 

It may be worth paying less for comparable boilers, but a little bit more for better quality and more reliable boilers. 

Boiler Prices Verdict on the Keston Boilers: 1/5

The lack of consumer reviews and unreliable information from around the web makes it difficult to assess Keston boilers with any conviction. However, we don’t feel as though we can score Keston any higher than 1 out of 5.

First of all, the vast majority of Keston customers who have left reviews do not paint a picture of positivity. The overriding theme suggests these boilers are unreliable and problematic. 

In addition, it’s telling that Keston is not featured on the Which? survey we usually use as an indicator and comparison tool to determine the quality and reliability of a boiler. The Which survey reaches out to over 10,000 boiler owners who have experienced faults or breakdowns with their boilers in the previous six years. 

There is also some fog around the seasonal energy efficiency and SEBDUK rating of Keston boilers. During our research efforts, we found affiliate websites quoting a 93% ErP and as high as 97% seasonal rating. However, Keston does not divulge the precise percentages on their website or sales literature, stating quite simply that their boilers are “A-rated” and “high” energy efficient. 

If the seasonal energy saving was 93% or 97%, Keston would state that figure publicly given it’s above average and worthy of mention. We did find one website that shows Keston boilers have an energy efficiency of 89.6% which just creeps into the A-rated category. 

Digging deeper, we found the current A-rating is measured against 89.6% SEBDUK 2009 which is below average. We got this information from Keston’s official spec sheets. The figures quoted by other sites are measured against the outdated SEDDUK 2005. This is why you have to be careful about the information provided on affiliate websites. Always do your research. 

So, why buy a Keston boiler?

One of the great things about choosing a Keston boiler is that you’ll be supporting a British manufacturer that’s available to offer professional help and advice 364 days a year. 

Also, the brand offers industry-standard warranties with its boilers and the option to extend your guarantee to 7 years simply by ensuring the boiler is installed by a Keston system fitter and registered on the Keston website within 30 days of the installation. 

Keston boilers are not the cheapest solutions on the market and you might get better quality for the same money, or comparable quality for less.

Why You Can Trust Boilers Prices

Boiler Prices were established in 2013 to help you identify the best boiler for your home and to get access to the most affordable boiler quotes from a central location without having to waste time shopping around. Our service is fast, efficient and effective. We source the best quotes offered by national installers and local boiler installers. 

But it’s all very well and good reading the information we publish on our website, but how do you know you can trust the advice we provide? 

Well, first and foremost, we want to assure you that Boiler Prices does not have any direct affiliation with Keston or any other boiler manufacturer. The information we present is 100% unbiased, impartial and given to the best of our knowledge. 

Moreover, we source our information from customer feedback, and recognised review websites (like Which? and Energy Savings Trust etc) together with gas-safe engineers and other professionals working in the energy and heating sector. 

We appreciate that UK homeowners want to know if these new energy-efficient boilers are reliable, efficient and available for a good price. Boiler Prices not only step in to provide information you can trust, but we also save you hours having to research the extensive boiler market.

For the best and most cost-effective boiler prices, you will have to do some shopping around. We recommend getting a quote from a national installer and a local boiler installer to see which gives you the best price. When you use Boiler Prices as your platform to look for boiler prices this is what we provide you with as a matter of course.

Boiler Prices have been providing UK homeowners with trustworthy information and boiler price comparisons since 2013. Not only that but our founder, Duncan Cumming has over a decade of experience in the boiler industry working directly with consumers. He is fully aware that reliable information needs to be improved in the boiler market and knows the questions homeowners want answered. 

All these factors make Boiler Prices the most trusted source of information about energy-efficient boilers – because we provide up-to-date and accurate information together with honest appraisals that say it how it is.

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