Are you on the hunt for a new gas boiler and want to know which boiler installation company is the most reliable or factors to consider when choosing boiler installers?
Choosing a gas boiler installer is one of the most important home decisions you’ll make. A poor installation can leave you with higher energy bills, an unsafe and unreliable system, or costly repairs down the line.
The Gas Safety (Installation and Use) Regulations 1998 require anyone carrying out work on gas appliances like boilers as part of their business to be competent and registered with the Gas Safe Register. There are many rules to consider, and with dozens of companies promising the “best deals” or “quick installations,” it’s easy to feel overwhelmed or pressured into a choice that doesn’t fully suit your home.
To help you cut through the noise, we’ve reviewed and compared the UK’s top boiler installation companies, not just based on price, but on real customer experiences, transparency, warranty cover, service quality, and long-term value. Whether you’re looking for a smart boiler with app control, a reliable installer with fixed pricing, or just someone who will turn up on time and do the job properly, we’ve researched so you don’t have to.
From household names like British Gas to fast-growing disruptors like Heatable and Boxt, you’ll find the pros, cons, and unique strengths of each provider, plus honest advice to help you choose with confidence.
Quick Takeaways on the Best Boiler Installers UK 2025:
- Boxt, Heatable, and Boiler Central offer fixed-price quotes, fast online booking, and next-day installation across much of the UK.
- Heatable and Boiler Central provide some of the longest warranties—up to 12 years on selected boilers.
- British Gas is ideal if you want full heating system upgrades, boiler cover, and nationwide service, though it’s usually more expensive.
- Expect to pay £1,800–£3,700 for a new boiler installation, depending on boiler type, property layout, and extras.
- Always check for Gas Safe registration, verified customer reviews, and whether the boiler installers handle warranty registration and aftercare.
- For best value, compare at least three quotes and look for installers who include smart thermostats, filters, or system protection in their packages.
Best Boiler Installers/Companies in 2025
1. Boxt
Why Boxt Stands Out:
Boxt is one of the most talked-about boiler installers in the UK—and for good reason. Backed by Bosch and known for its slick online quoting system, Boxt has made boiler buying feel more like online shopping. You answer a few simple questions, get a fixed price within minutes, and can book an installation in as little as 24 hours.
Key Features:
- Fixed, transparent pricing
- Installs leading boiler brands: Worcester Bosch, Vaillant, Ideal
- Free smart thermostat with some packages
- Excellent online reviews (Trustpilot score of 4.8 from 44,879 reviews)
What We Like:
Boxt is ideal for tech-savvy homeowners who want speed, clarity, and top-tier brands without negotiating with multiple salespeople. The process is entirely online, with clear pricing and optional add-ons. Customers frequently commend the company’s service, highlighting its promptness and helpfulness from the initial quote to the installation process.
Potential Drawbacks:
Not suitable for highly complex installations (e.g., homes with multiple zones or unusual pipework). You won’t get an in-person quote beforehand, which some homeowners prefer.
2. Heatable
Why Heatable Stands Out:
Heatable is another online-first boiler installer with a focus on low prices and fast turnaround. Known for undercutting big players like British Gas, it specialises in combi boiler replacements and offers some of the most competitive deals on Viessmann and Worcester Bosch models.
Key Features:
- Fixed prices with instant online quotes
- Strong warranties (up to 12 years)
- Next-day installation options
- Special pricing on Viessmann boilers
- Excellent online reviews (Trustpilot score of 4.8 from 11,971 reviews)
What We Like:
Heatable is laser-focused on affordability. If you’re after a high-efficiency boiler at a great price with minimal fuss, it’s a solid pick. The user interface is clean, and the financing options are flexible. Customers consistently praise the company’s service, highlighting its excellence and efficiency. Many consumers find the price point impressive and competitive, while the booking process is frequently described as hassle-free and easy to navigate.
Potential Drawbacks:
Customer support is phone and email only—no face-to-face service. Limited to specific brands and system types.
3. Boiler Central
Why Boiler Central Stands Out:
Boiler Central has carved out a niche by offering next-day boiler installation with zero deposit finance and generous warranty cover. It also provides live chat support and more personalised advice than some of the ultra-streamlined competitors.
Key Features:
- Up to 12-year warranties on selected models
- No-deposit finance available
- Installation by Gas Safe engineers across the UK
- Offers Ideal, Worcester Bosch, and Alpha boilers
- Excellent online reviews (Trustpilot score of 4.5 from 6,144 reviews)
What We Like:
Boiler Central balances the digital-first model with more tailored support. Their customer service is responsive, and they publish helpful buyer guides alongside their boiler offers. Customers appreciate the seamless service and booking process. Many consumers have reported positive experiences with the customer service team, finding them helpful and attentive.
Potential Drawbacks:
Not quite as slick as Boxt or Heatable on the quoting side, and deals are not always the cheapest depending on location and boiler type.
4. WarmZilla
Why WarmZilla Stands Out:
WarmZilla positions itself as a budget-friendly option for boiler installation, with the bonus of a free smart thermostat and system filter included in many of its packages. It offers a wide range of brands and an ultra-easy online quote process.
Key Features:
- Instant fixed-price quotes
- Free Google Nest or Hive thermostat with selected boilers
- Warranty options up to 10 years
- Broad range of brands: Alpha, Ideal, Worcester Bosch
- Excellent online reviews (Trustpilot score of 4.7 from 1,845 reviews)
What We Like:
Great value packages and solid customer support. WarmZilla is a good option if you’re on a budget but still want tech perks and a reputable installation. Customers consistently praise the company’s service, highlighting its efficiency and speed. They also appreciate the clear and informative communication throughout the entire process, from initial inquiries to post-installation follow-ups.
Potential Drawbacks:
Slightly lower Trustpilot scores and fewer reviews than Boxt or Heatable. May not offer the same level of detail in aftercare support.
5. British Gas
Why British Gas Stands Out:
While often more expensive, British Gas remains the most recognised name in the industry. With nationwide coverage, 24/7 support, and well-trained engineers, it’s a go-to for homeowners who prioritise reliability and brand reputation.
Key Features:
- Extensive UK-wide coverage
- Boiler & Central Heating Cover options available
- Flexible installation times
- Wide range of boiler brands (including their own range)
- Excellent online reviews (Trustpilot score of 4.3 from 291,059 reviews)
What We Like:
British Gas offers peace of mind and is ideal for customers who want full-service solutions, including maintenance plans and emergency cover. Customers appreciate the efficient and professional service provided by British Gas engineers, who are often described as friendly, polite, and knowledgeable. People highlight the ease of booking appointments online and the promptness of the engineers, who typically arrive on time and complete their work efficiently.
Potential Drawbacks:
Typically more expensive than online-first competitors. Quotes often require a home visit and a sales process.
Best Boiler Installers/Companies Comparison Table
| Installer | Fixed Prices | Finance Options | Boiler Brands | Warranty Length | Best For |
|---|---|---|---|---|---|
| Boxt | Yes | Yes | Worcester, Vaillant, Ideal | Up to 10 yrs | Fast installs, premium brands |
| Heatable | Yes | Yes | Viessmann, Worcester | Up to 12 yrs | Best prices |
| Boiler Central | Yes | Yes | Ideal, Alpha, Worcester | Up to 12 yrs | Tailored support |
| WarmZilla | Yes | Yes | Alpha, Ideal, Worcester | Up to 10 yrs | Best value bundles |
| British Gas | No | Yes | Various + own range | Up to 10 yrs | Full service, brand trust |
What About Local Boiler Installers?
National providers offer convenience, but don’t overlook local Gas Safe engineers. Independent installers may provide more personalised service, lower prices, or better flexibility. Many also work directly with top boiler brands and can offer similar warranties—especially if they’re accredited by Worcester Bosch or Vaillant.
Tips for choosing a local installer:
- Ask to see their Gas Safe ID
- Check Trustpilot or Google reviews
- Compare at least 2–3 quotes
- Ask about warranty registration and aftercare
Did you know the efficiency of your boiler can impact the amount of energy it uses and ultimately impact your heating bill costs? Check out our guide to the best condensing boilers if you are interested to find out more.
Finance Options from Boiler Installers in the UK
Boxt – Flexible Payment Plans
- 0% APR available on selected boilers over 12 or 36 months
- Up to 10 years of finance with interest-bearing options
- No deposit required for most plans
- Instant eligibility check during online quote
- Option to pay upfront or split the cost
Boxt partners with Novuna for consumer credit and is FCA authorised. You can adjust your deposit to reduce monthly payments.
Heatable – Low-Cost Monthly Payments
- 0% APR on selected models (e.g., Viessmann and Worcester)
- Standard plans up to 10 years with interest (typical 9.9% APR)
- £0 deposit required for most options
- The monthly breakdown is shown clearly in the quote
Heatable also works with Novuna and shows repayment costs upfront. Best for affordable monthly deals without hidden fees.
Boiler Central – No Deposit Required
- 0% interest-free finance over 1 or 2 years
- Extended options up to 10 years with interest (typical APR: 9.9%)
- £0 deposit required
- Approval decision during the online quote process
Boiler Central has a strong reputation for making financing accessible, even if you don’t want to pay anything up front.
WarmZilla – Flexible Terms, Low Deposits
- 0% finance available on select boilers over 2 years
- Interest-bearing plans over 3–10 years (up to 9.9% APR)
- Deposit optional (can choose from £0 to £1,000+)
- Finance calculator built into online quote tool
WarmZilla gives you control over deposit and term length. Great for balancing short-term affordability and long-term cost.
British Gas – Widest Finance Range
- Interest-free plans up to 2 years
- Interest-bearing credit over 3 to 10 years (typical APR: 11.9%)
- Custom deposit options (including £0)
- Finance includes installation, boiler, and optional add-ons
- Credit eligibility check handled during home survey
British Gas works with multiple lenders and is FCA-regulated. Best suited for those who want full-service, brand-backed finance—even with higher rates.
Factors to Consider When Choosing Boiler Installers
When you are comparing any type of boiler installation company, these are the factors that you should bear in mind:
Which Boiler Installers Offer a Fixed Price?
A fixed-price quote means you’ll know exactly how much you’re paying before any work begins. It protects you from surprise add-ons, upsells, or price changes once the engineer arrives. It also reflects transparency and professionalism—qualities that are essential when inviting someone into your home to install a major appliance. Fixed prices give you confidence to budget properly and compare offers fairly across different providers.
Who offers it:
- Boxt – Yes
- Heatable – Yes
- Boiler Central – Yes
- WarmZilla – Yes
- British Gas – No (price confirmed after home survey)
Want to learn about all the factors that contribute to a boiler quote? Check out our boiler cost calculator to understand the latest boiler deals and what is factored into a gas boiler replacement estimate.
Which Boiler Installers Offer the Best Warranty Length?
Boiler repairs can be expensive, and a long warranty protects you from those costs for years to come. It’s also a strong signal of confidence in the quality of both the boiler and the installation. Some installers include extended warranties by default, while others only offer them if certain criteria are met. Make sure your installer registers the warranty properly and clearly explains what’s included and how to claim it.
Warranty comparison:
- Heatable – Up to 12 years
- Boiler Central – Up to 12 years
- Boxt – Up to 10 years
- WarmZilla – Up to 10 years
- British Gas – Typically 5–10 years
Which Boiler Installers Offer a Workmanship Warranty?
A boiler warranty only covers faults with the appliance itself, but a workmanship warranty covers any issues caused by the installation process. If a pipe leaks, the pressure drops, or something fails due to a poor fitting, a workmanship guarantee ensures it will be fixed at no extra cost. It’s a sign that the company takes responsibility for its engineers and won’t leave you stranded if problems arise after the job is done.
Workmanship cover:
- Boxt – 12-month installation warranty
- Heatable – Standard labour cover
- Boiler Central – 1-year labour warranty
- WarmZilla – 12 months included
- British Gas – 12-month installation guarantee
Which Boiler Installers Are Qualified and Accredited?
Gas boilers must be installed by a Gas Safe registered engineer—it’s a legal requirement in the UK. Beyond that, some installers have accreditation from boiler manufacturers like Worcester Bosch or Vaillant, which can allow them to offer longer warranties or higher-quality installations.
Always check your engineer is registered by asking to see their ID card, which has a photo of the engineer, their business registration number and personal licence number, company name, the start and expiry date of the card, and a security hologram. The reverse of the card details what kind of gas work the engineer is able to do (ensure it says gas boiler).
Qualification check:
- Boxt – Gas Safe registered
- Heatable – Gas Safe registered
- Boiler Central – Gas Safe registered
- WarmZilla – Gas Safe registered
- British Gas – Gas Safe registered (in-house engineers)
Which Boiler Installers Have the Best Customer Service?
If something goes wrong, or you have a question, you want to speak to someone helpful without long wait times or confusing processes. Good customer service means quick responses, clear explanations, and real support when you need it most. This becomes especially important during colder months or emergencies when you’re relying on your heating system to keep your home safe and comfortable.
Customer service quality:
- Boxt – Excellent live chat and phone support
- Heatable – Phone and email only
- Boiler Central – Responsive live chat and email
- WarmZilla – Friendly support with slightly lower reviews
- British Gas – 24/7 support but mixed ratings
Got a common boiler problem? Check out our quick fix guide on boiler lockout, boiler ignition faults, boiler PCB faults, faulty diverter valves and boiler timer issues.
Which Boiler Installers Offer Next-Day Installation?
Boilers often fail unexpectedly, and waiting several days without heating or hot water can be stressful, especially in winter. Next-day installation availability means less disruption to your daily life and faster restoration of comfort. It’s also a good indicator of how well a company manages logistics and engineer availability. If speed is a priority, this feature can be a deciding factor.
Next-day availability:
- Boxt – Often available
- Heatable – Often available
- Boiler Central – Yes, UK-wide
- WarmZilla – Frequently offered
- British Gas – Usually takes 3–5 days
Which Boiler Installer Offers the Best Choice of Boiler Brands?
Some installers only work with one or two brands, while others give you more variety. The brand affects everything from energy efficiency and lifespan to warranty cover and available features. If you have a preferred make, like Worcester Bosch or Viessmann, it’s worth checking whether your installer can provide it. More choice also means better odds of finding the right fit for your home and budget.
Boiler brand range:
- Boxt – Worcester Bosch, Vaillant, Ideal
- Heatable – Viessmann, Worcester Bosch
- Boiler Central – Ideal, Alpha, Worcester
- WarmZilla – Alpha, Vaillant, Ideal, Worcester
- British Gas – Baxi, Worcester, Glow-worm, own-brand
Which Boiler Installer Offers Installation of Radiators and Water Tanks?
If you’re upgrading your entire central heating system and not just the boiler, you may need new radiators, a hot water cylinder, or system conversions. Some installers only provide boiler swaps, while others offer complete heating packages. Choosing a provider that can handle all your needs simplifies the process and may offer better value than hiring multiple tradespeople separately.
Additional installation services:
- Boxt – Boilers only
- Heatable – Boilers only
- Boiler Central – Radiators and tanks (limited)
- WarmZilla – Full system add-ons available
- British Gas – Full central heating systems available
Which Boiler Installer Has the Best Reviews?
Customer reviews give you real-world insight into how a company treats its customers—before, during, and after installation. High review scores reflect consistent service, while poor ones can highlight patterns like missed appointments, poor aftercare, or unclear pricing. Always look at multiple sources (Trustpilot, Google, Reviews.io) and focus on recent feedback for the most accurate picture.
Trustpilot ratings:
- Boxt – 4.8
- Heatable – 4.8
- Boiler Central – 4.5
- WarmZilla – 4.7
- British Gas – 4.3
How Much Is A New Boiler Installation?
The cost of a new or replacement boiler will vary, depending on your setup. According to the Energy Saving Trust, the average cost for replacing a G-rate gas boiler with an A-rated boiler, with thermostatic radiator valves is £3,700.
What Affects the Cost?
- Boiler type: Combi boilers are usually the most affordable, while system or regular boilers (especially with tanks) cost more.
- Brand and model: Premium brands like Worcester Bosch or Viessmann are more expensive than budget options like Vokera or Glow-worm.
- Complexity of the job: Converting from a system or regular boiler to a combi involves more labour and pipework. In some cases scaffolding may be required, which can increase the price.
- Location: Installation prices can vary based on where you live in the UK.
- Extras: Smart thermostats, magnetic filters, new flue kits, or replacing old radiators will increase the total cost.
Can You Reduce the Cost?
Yes, by:
- Comparing quotes from multiple Gas Safe boiler installers
- Taking advantage of finance plans or 0% interest offers
- Checking if you qualify for government schemes (like the Boiler Upgrade Scheme or ECO4 grants)
You can get a better idea of how much a new boiler for your home may cost using our boiler installation calculator.
Check out our boiler brand price guides and comparisons:
- British Gas new boiler costs.
- How much is it to fit a new boiler?
- How much does a Vaillant boiler cost?
- Baxi boiler costs.
Summary of the Best Boiler Installers/Companies UK 2025
A new boiler is a major investment, and choosing the right installer can make all the difference, not just in the price you pay today, but in how your heating system performs for years to come. The best installers offer more than just fast service or big brand names. They provide clear pricing, generous warranties, and the kind of support that makes you feel confident your home is in good hands.
Whether you’re drawn to the speed and simplicity of online-first companies like Boxt and Heatable, or you prefer the full-service approach of British Gas, the key is finding a provider that matches your needs, not just your postcode. Strong reviews, Gas Safe registration, and the ability to explain your options clearly should be non-negotiables. If you’re upgrading more than just your boiler, look for installers who can handle radiators, tanks, or even full system conversions.
Ensure you compare your options without pressure. Take your time, ask the right questions, and remember: a reliable installer doesn’t just fit a boiler. They keep your home warm, safe, and running smoothly long after the installation is done.
FAQs on the Best Boiler Installers/Companies UK 2025
What Is the Best Boiler Company in the UK?
The best boiler company depends on what you value most—efficiency, reliability, warranty, or price. Worcester Bosch and Viessmann consistently lead the pack for performance and long-term satisfaction, with Ideal and Vaillant also offering high-quality models. Worcester Bosch is known for its service network and engineer-friendly design, while Viessmann boilers stand out for advanced technology and long warranties. Both are trusted brands across the UK.
What Is the Best Boiler in 2025?
In 2025, some of the highest-rated boilers include the Viessmann Vitodens 100-W, Worcester Bosch Greenstar 8000, and the Ideal Logic+ Combi. These models combine high energy efficiency, quiet operation, long warranties, and smart control compatibility. The Viessmann 100-W is especially popular for its 94% efficiency and durable stainless steel heat exchanger. For most UK homes, a high-efficiency combi boiler from one of these trusted brands offers the best balance of performance and value.
What Is the Maximum Life of a Boiler?
Most modern gas boilers last around 10 to 15 years, depending on how well they’re maintained. Annual servicing, water quality, and correct installation all play a role in extending lifespan. While some well-kept boilers can last 18 to 20 years, efficiency usually starts to drop after the 10–12 year mark. If you’re facing frequent breakdowns or rising energy bills, it might be time to consider a replacement.
Which Boiler Has the Highest Efficiency?
Condensing combi boilers are currently the most efficient option for UK homes, with models like the Viessmann Vitodens 100-W and Worcester Bosch Greenstar achieving up to 94% efficiency. These boilers recover heat that would otherwise be lost through the flue, making them more economical than older systems. Look for an ErP A-rating and check that your installer sets up the system correctly to ensure peak efficiency.
How Do I Choose a Boiler Installer?
Start with the essentials: the installer must be Gas Safe registered. From there, check whether they offer fixed-price quotes, strong customer reviews, and warranties of at least 7 years. It’s also worth comparing finance options, installation timelines, and whether they’re accredited by major boiler manufacturers. A good installer won’t just fit the boiler—they’ll help you choose the right one for your home and ensure it runs efficiently for years to come.
Sources and References
Health and Safety Executive – Gas appliances. Get them checked. Keep them safe
Trustpilot – BOXT
Trustpilot – Heatable
Truspilot – Boiler Central
Trustpilot – Warmzilla
Trustpilot – British Gas
Energy Saving Trust – Boiler types explained