UK's Trusted Boiler Installer 
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As soon as your boiler starts showing age or breaks down altogether, finding a new boiler, along with a reliable installer becomes a top priority. You don’t just want anyone installing your new boiler - you want a trusted professional who can deliver high-quality work, fair prices and lasting peace of mind.
Choosing the right boiler installer can make all the difference. A smooth installation means better energy efficiency, lower heating bills and fewer problems down the line. However, with so many installers across the UK, knowing who to trust can feel overwhelming.
That’s where this article comes in. Here, you’ll find a carefully curated list of the best boiler installers in the UK. These companies are known for outstanding service, certified engineers and positive customer reviews.
Whether you’re replacing an old gas boiler, upgrading to a combi model or exploring the latest energy-efficient heating systems, you’ll be able to compare options and choose the right installer for your home and budget.
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| Boiler Installer | Trustpilot Score | Number of Reviews (Trustpilot) |
|---|---|---|
| 1. Glow Green | 4.7 | 13,390 |
| 2. BOXT | 4.8 | 50,810 |
| 3. E.ON | 4.5 | 179,637 |
| 4. British Gas | 4.3 | 311,351 |
| 5. iHeat | 4.8 | 9,833 |
Trustpilot scores and review counts in all tables were accurate at the time of data collection: November 28, 2025. Note that these values may change over time.
| Boiler Installer | Trustpilot Score | Number of Reviews (Trustpilot) |
|---|---|---|
| Glow Green | 4.7 | 13,390 |
Glow Green is a national boiler installer that focuses on giving you a simple, hassle-free way to upgrade your heating system. You can get a quote online, spread the cost with finance options and have your new boiler fitted by qualified engineers who work to modern energy-efficiency standards.
As well as installing new boilers, Glow Green also offers ongoing servicing and maintenance, so you have support long after the installation is complete. This mix of competitive pricing, flexible payment plans and a strong focus on customer service is what makes Glow Green stand out as one of the best boiler installers in the UK.
Beyond boilers, Glow Green also installs other home energy products including air conditioning, heat pumps and solar panels, so you can improve both your comfort and your energy efficiency with a single, trusted provider. This wider range of installations means you can future‑proof your home, lower your energy bills and make your property greener while dealing with one company that understands your overall heating and energy needs.
Good to Know:
Glow Green is proud to be accredited installers of Worcester Bosch, Vaillant & Glow-worm boilers.
Gas Safe certified which ensures that your installation will be completed to the highest standard, with full paperwork issued.
Trusted by thousands with over 13,000 Trustpilot reviews, successfully trading for over 14 years.
Work is undertaken by fully qualified, registered & accredited engineers.
What Have Customers Said?
"Having a boiler fail on you is a daunting experience but with Glow Green we received a problem free service with everything sorted within days. Best price, quickest installation with a lovely friendly engineer who did a great job with no problems. Everything running perfectly now, better than before! I would have no hesitation recommending this company! Very pleased!" - Trustpilot
Ready to get a new boiler installed? Get your free, no-obligation boiler quote with Glow Green today!
| Boiler Installer | Trustpilot Score | Number of Reviews (Trustpilot) |
|---|---|---|
| BOXT | 4.8 | 50,810 |
BOXT is a national boiler installation company that focuses on making the whole process quick, simple and transparent for you. You start by answering a few questions about your home online, then see clear, upfront prices for a range of boilers without any hidden extras, so you know exactly what you’re paying for.
The company focuses on supplying and fitting modern, energy-efficient boilers from well-known manufacturers, with installation carried out by qualified, Gas Safe registered engineers for your safety and peace of mind. You can often choose flexible payment options, including paying monthly, which helps you spread the cost of a new boiler to suit your budget.
While BOXT also offers other home products, boilers remain at the heart of what they do, from combi replacements to full central heating upgrades. The combination of fixed pricing, quick online quotes and fast installation is what makes BOXT a popular choice when you are looking for a convenient way to get a new boiler installed.
What Have Customers Said?
"We needed a new boiler when our old one finally packed in. Ordered a Worcestor Bosch through the Boxt website on the Wednesday evening, and it was installed and running by Friday lunchtime. Easy ordering process, and great communications via the app and text messages. Parts turned up at 6.30am on installation day, and engineer was here an hour later. Ian was very friendly and efficient, and explained the work and boiler controls etc. Old boiler and packaging all taken away. Very pleased - thanks!" - Trustpilot
| Boiler Installer | Trustpilot Score | Number of Reviews (Trustpilot) |
|---|---|---|
| E.ON | 4.5 | 179,637 |
E.ON is one of the UK’s major energy companies and also offers boiler services designed to help you move to a more efficient heating system with confidence. You can get help choosing between different boiler types, understanding running costs and finding options that could reduce your energy bills over time, so you feel more in control of your home heating.
When you arrange a new boiler through E.ON, the focus is on replacing older, less efficient models with modern boilers that are better for both your wallet and the environment. Many customers value the way queries are handled quickly, with staff taking the time to investigate issues properly and look for better deals where possible, which adds a more personal, supportive feel to the overall service.
What Have Customers Said?
"Always found E.on have the most professional customer telephone contact compared to other energy suppliers. The phones are answered quickly, any requests, problems or queries are easily dealt with and there’s a personal touch because they’re likely to be friendly. When I last moved house I did ring round suppliers to get the best deal but I was being told by all companies there was no gas supply at the new home. That was evidently untrue, a new gas central heating boiler had been installed a few days after the house was bought and it was working well. Only E.on had the gumption to investigate the problem, transpires the house was named when built not numbered as it is now. For such a large company to care about their customers/potential customers is a rarity, well done E.on. Special mention to Leigh, think she was working from Wales, spoke to her yesterday, she answered my query then looked at my contract for a cheaper option and found one. Thank you." - Trustpilot
| Boiler Installer | Trustpilot Score | Number of Reviews (Trustpilot) |
|---|---|---|
| British Gas | 4.3 | 311,351 |
British Gas is one of the best-known names in UK home energy and has a long track record of supplying, installing and looking after boilers. As a large national provider, it gives you access to a wide network of qualified engineers, a choice of modern, energy-efficient boilers and the reassurance that help can be arranged quickly when you need it most.
If you need a boiler in a hurry, British Gas can often move from survey to installation within just a few days, with teams that understand how important heating and hot water are for your household, especially if you have young children or vulnerable family members. Engineers typically arrive on time, work efficiently and aim to leave your home clean and tidy, which helps make the whole experience feel professional, organised and reassuring when you are dealing with a stressful boiler breakdown.
What Have Customers Said?
"Urgent boiler replacement required. Appointment booked with British Gas online Sunday, 29/11. Survey date confirmed for Thursday, 4/12. Planning team called before 10am on Friday 5/12, confirming we were booked in for boiler replacement on Monday 8/12. Took in to account that we had child under age of 5 years old. Engineers arrived 8am Monday 8/12 and were done by 3pm. Professional efficient, clean, friendly. We are incredibly impressed. Thanks to Phillip Butler and the team for their great work today." - Trustpilot
| Boiler Installer | Trustpilot Score | Number of Reviews (Trustpilot) |
|---|---|---|
| iHeat | 4.8 | 9,833 |
iHeat is a UK boiler installation company that focuses on giving you a quick, straightforward way to sort a replacement when your old boiler lets you down. You can get an online quote in minutes, compare competitive fixed prices and choose from a range of boilers that come with reassuring warranty cover, which helps you feel more confident about the investment.
The service is designed to be as smooth and hassle-free as possible, from clear pricing on the website through to the actual installation in your home. Some customer reviews have said that installers typically protect your floors and carpets, work cleanly and leave everything tidy around the boiler, while support teams are on hand through online chat to answer questions quickly and keep you updated at each stage.
What Have Customers Said?
"I was recommended to go to Iheat as my boiler was broken down and I was struggling to find a local plumber. The website was easy to use and the prices were really competitive- especially with the added warranty it was a no brainer. The installation was smooth and faultless- Greg covered all my carpets and flooring ensuring no mess was left behind and everything was clean and tidy around the boiler I also used the live chat and got fast responses without any hassle." - Trustpilot
Even though we have provided you with our 5 best boiler installers in the UK, it still helps to know what to look for when you are making your final choice.
Ultimately, the installer you pick will affect how well your new boiler performs, how safe and efficient your heating system is, and how smooth and stress-free the whole process feels from quote to completion.
Here are the key factors to think about:
Always check that your installer is Gas Safe registered as this is a legal requirement for anyone working on gas boilers. You should also look for additional accreditations from boiler manufacturers or recognised trade bodies as these can show extra training and expertise.
Make sure the installer has experience with the type of boiler you need, whether it’s a combi, system or regular boiler. If you are changing boiler type or upgrading an older system, an installer who regularly handles similar jobs will be better placed to give you the right advice.
Take time to read recent customer reviews to see how the company performs in real homes. Look for patterns around punctuality, tidiness, communication and how they handle problems, rather than focusing on one or two extreme comments.
A good installer will give you a clear, written quote that breaks down the cost of the boiler, installation and any extras. Avoid companies that are vague about pricing or pressure you to make a quick decision, as this can be a warning sign.
Check what boiler warranty is included and whether the installer offers their own workmanship guarantee. It is also worth asking about servicing, repairs and emergency support, so you know who to contact if something goes wrong later.
If your boiler has broken down, how quickly they can survey and install may be very important. Ask about lead times and how long the installation is likely to take, so you can plan around any disruption.
Notice how easy it is to get in touch with the installer and how clearly they answer your questions. Friendly, helpful communication from the start usually reflects how they will treat you throughout the installation and beyond.
If you prefer to spread the cost, look for installers that offer finance, monthly payments or flexible options. Make sure you understand the total amount you will pay, including any interest or fees, before you agree to anything.
For this article, around ten of our boiler engineers and heating experts shared the qualities they believe every good installer should have, and these became the benchmarks each company had to meet.
Here are the main things taken into account when selecting the top boiler installers:
Installers were chosen based on strong, repeated praise from customers, not just one-off comments. Feedback about overall satisfaction, reliability and whether people would recommend the company again played a big part.
Extra weight was given to companies where engineers and support teams kept you informed at every stage. This includes advance calls before arrival, clear explanations of the work being done, and taking the time to answer questions about your boiler and controls.
Installers that made it easy to arrange a quote, survey or virtual assessment were favoured. Being able to quickly identify the right boiler and secure an installation date without confusion or delay was an important consideration.
Companies whose engineers arrived when they said they would, worked efficiently and completed installations or services in good time scored highly. This reliability matters even more when you are without heating or hot water.
Careful, neat work was a key factor, including how well the boiler was fitted and how tidy the property was left afterwards. Installers who protected your home, minimised mess, and left everything clean and orderly stood out.
Extra credit went to installers whose engineers took time to walk you through how to use your new boiler, thermostat and controls. Offering practical tips, answering follow-up questions and even checking related issues showed a higher standard of service.
Companies that checked in after installation or servicing, and offered clear routes for support if anything wasn’t quite right, were rated more highly. Ongoing care and responsiveness after the job is done are crucial for long-term peace of mind.
Once you have chosen an installer, you still need to decide whether to keep your current boiler type or switch to a different one, depending on your home and hot water needs. Understanding the main options makes it much easier to have a useful conversation with your installer and feel confident in your final choice.
Here are the main types of boilers you are likely to come across:
Combination (combi) boilers: A combi boiler gives you heating and hot water from a single compact unit, without any separate water tanks or cylinders. This makes it a great choice for smaller homes or flats, especially if you only have one main bathroom and want to save space.
System boilers: A system boiler works with a hot water cylinder but does not need a big cold water tank in the loft. It suits medium to larger homes with more than one bathroom because it can supply hot water to several taps or showers at the same time without the pressure dropping too much.
Conventional or regular (heat only) boilers: A conventional boiler uses both a hot water cylinder and a cold water tank, so it is usually found in older properties that were designed with this layout in mind. It can cope well with high hot water demand, but it takes up more space and is often less efficient than modern combi or system setups.
Electric boilers: An electric boiler runs on electricity instead of gas or oil and is generally quiet, compact and simple to look after. It can be a good option if your home is not connected to the gas grid or if you want a cleaner, low‑emission system, particularly when paired with renewable electricity.
If you're thinking about having your new boiler supplied and fitted by Glow Green, here are some of the key reasons why choosing us can work in your favour:
Every boiler comes with a solid warranty that protects you for years, so you can relax knowing your investment is covered against unexpected issues.
Thanks to our position as a major UK supplier, you get great value through bulk buying power, plus a price match guarantee that ensures you are not overpaying compared to anywhere else.
We are official installers for trusted names like Worcester Bosch, Vaillant and Glow-worm, which means you benefit from specialist knowledge and manufacturer-backed quality.
All work is carried out by Gas Safe registered engineers, guaranteeing safe, professional installation with full documentation provided for your records.
Thousands of homeowners trust us, shown by over 13,000 positive Trustpilot reviews after more than 14 years in business, proving consistent reliability.
Every single installation is thoroughly checked for compliance, so you know the work meets the highest quality and safety requirements without cutting corners.
You can tell a boiler installer is qualified by checking that they are registered with Gas Safe for gas work and hold any relevant industry accreditations or manufacturer approvals.
As you can imagine, this is the number one question customers ask. At Glow Green, we have created an online quote tool that lets you see a personalised price instantly by answering a few basic questions about your home. The tool factors in details like the size of your property and your heating needs, then gives you a tailored quote with different boiler and payment options to suit your budget. This means you get a much clearer idea of what you are likely to pay before you commit to going ahead.
Most standard boiler swaps can be completed in one day, while more complex installations or system changes can take two days or longer. Your installer should explain how long your specific job is likely to take before any work begins.
The best type of boiler for your home depends on your property size, number of bathrooms, hot water demand and existing pipework. A good installer, such as Glow Green, will ask you detailed questions and recommend a suitably sized combi, system or regular boiler based on your situation.
Yes, you can usually swap a boiler for a heat pump, but it is not a like‑for‑like replacement and often needs more work to your heating system. Because of this, it is important to have a proper survey done by an installer who is experienced with both boilers and heat pumps, such as Glow Green. They can assess whether your home is suitable, explain what upgrades might be needed, and help you decide if switching from a boiler to a heat pump is the right option for your budget and comfort.
