The boiler is the heart of every heated home. It keeps your rooms warm in the winter, provides hot water for your bath and dishes, and helps your family stay comfortable year-round. When a boiler breaks down or is too old, the smart move is to call in a trusted expert to install or replace it properly.
London is full of boiler companies, and choosing the right boiler isn’t always easy. Some offer poor service at low prices. Others charge a lot for basic work. Many people spend hours reading reviews to make sure they’re making the right choice.
To make life easier for you, we’ve selected the top 10 boiler installation and replacement companies in London for 2026. Each company on this list is Gas Safe registered, known for quality work, and trusted by thousands of homeowners. We also cover boiler types, the benefits of a new boiler, a simple pre-installation checklist and a rough cost guide.
Let’s start by looking at what a boiler installation actually involves.
What is Boiler Installation and Replacement?
Boiler installation is not just about removing the old unit and installing a new one. It is a complete process that starts with checking your home’s heating needs and ends with a safe, legal and working system.
A trained engineer looks at your radiators, flue and pipework to make sure they are compatible with the new boiler. The engineer then tests the gas pressure, checks the safety valves and makes sure the boiler is running at full efficiency. Once the work is complete, you receive the appropriate paperwork proving that the work meets UK standards.
Replacement follows the same route, but the engineer also removes your old unit and disposes of it safely. A Gas Safe Registered Engineer is required for both boiler installation and replacement jobs as gas work cannot legally be carried out by a general tradesman. This rule keeps your family safe and protects your home from the dangers of leaks, faulty fittings or carbon monoxide.
Top 10 Boiler Installation and Replacement Companies in London (For 2026)
1. Prime Time Boilers
Prime Time Boilers proudly tops our 2026 list. Based in Essex and serving customers across London, Chelmsford, Romford, Colchester, Hertfordshire, Kent and the wider South East, the company has built a strong reputation for honest work, tidy installations and long-lasting boilers. Since 2010, their team of Gas Safe-registered engineers has fitted thousands of A-rated boilers in homes of all sizes. For homeowners looking for new boiler installation in Essex, Prime Time Boilers offers service backed by experienced engineers and strong customer reviews.
What makes Prime Time Boilers the first choice:
- Clear, fixed price quotes and free home surveys with no hidden fees
- A-rated energy-efficient boilers from top brands such as Worcester Bosch, Vaillant, Ideal, Whisman, Baxter and Glo-Warm
- Up to 12 years manufacturer warranty on new boilers, plus a 24-month workmanship warranty
- Next day installation slots for immediate replacement when you don’t have hot water or heating
- A free Honeywell Smart Thermostat worth £300 included with every installation
- Magnetic filter, limescale filter and full chemical flush included as standard
- Flexible finance from just £9.99 per month so you can share the cost with no deposit
- Friendly engineers who explain the full system and controls before you leave
- Gas servicing, oil servicing and heat pumps Full aftercare service including support
Homeowners in London and Essex love the fact that Prime Time Boilers treat every home like their own. From the meticulous dusting of floors before, during and after work to clear communication, they set a standard that others strive to follow. Their Trustpilot and Google reviews show thousands of happy customers, and their trained team are FCA-regulated, Gas Safe approved and MCS accredited.
2. Pimlico Plumbers
Pimlico Plumbers is one of the most well-known heating and plumbing names in London. They have engineers based in the capital and offer same-day services, seven days a week.
- 12-month workmanship guarantee on all installations
- Fixed price every day of the week, weekends included
- Wide stock of A-rated boilers from Ideal, Vaillant and Worcester Bosch
- One hour emergency response for boiler breakdowns
- 24/7 phone line for urgent calls
3. British Gas
British Gas is a household name and one of the largest boiler suppliers in the UK. They have a wide reach in London, and they offer a full quote and install service with a long warranty.
- Free home visit with fixed price quote
- 5 year British Gas warranty on all parts and labour
- Which one? Trusted merchant status
- Flexible finance with £0 deposit options for up to 10 years
- Over 100 boiler models in stock from leading brands
- Carbon monoxide detector and room thermostat included with every installation
4. PCH Boiler Repair London
PCH Boiler Repair London is known for its fast response times and skilled work. Whether you need a full installation or an emergency repair, their team is ready around the clock.
- 24/7 emergency service in central London
- Gas Safe Registered Engineers with years of experience
- Fast installation times with little disruption to your day
- Clear pricing with no hidden fees or surprise charges
- Both residential and commercial jobs covered
5. Heat Knights Boiler Repair
Heat Knights serve South East London and focus on both boiler repairs and full installations. They are renowned for their heating solutions that fit every home.
- Fully qualified Gas Safe Registered Engineers
- A full range of services from installation to servicing and emergency repairs
- Focus on energy saving boiler models to reduce your bills
- Personal service to meet the needs of each customer
- Strong local reputation in South East London
6. London Heating Solutions Ltd
Located in the Sutton area, London Heating Solutions Ltd covers a wide range of boiler jobs. They have strong customer reviews and work on all major boiler brands.
- Full installation, repair and annual maintenance plans in one place
- Reasonable prices without compromising on quality
- High-efficiency boilers to help reduce monthly energy bills
- Trusted by many long-term customers in South London
- Free advice on the best boiler for your home
7. Boiler & Heating Care Ltd
Boiler & Heating Care Ltd offer reliable installation and maintenance services in South East London. Their engineers are Gas Safe registered and are known for their clear pricing.
- Skilled Gas Safe Engineers on every job
- Flexible installation plans to fit any budget
- Regular check-ups to keep your boiler running smoothly
- Open, honest pricing from start to finish
- Support for combi, system and conventional boilers
8. City Boiler Repair
City Boiler Repair is a trusted name in the City area. They handle all types of boilers from combi to system boilers and offer same day service where possible.
- Fast, same day repair and install slots
- Certified engineers with strong technical experience
- Skilled in complex heating systems for older buildings
- Reasonable prices for both homes and small businesses
- Focus on quick fixes with lasting results
9. Extra Maintenance
Extra Maintenance is based in Letchworth, just outside London, and covers North London along the A1 corridor. They work with block managers, landlords and large property owners.
- Gas Safe registered team, with both commercial and domestic expertise
- Full compliance with current UK safety regulations
- Support for block management, landlords and commercial premises
- Planned service schedules to prevent boiler breakdowns
- Fast reactive response to urgent heating issues
10. Efficient Home Energy
Efficient Home Energy serves Bromley and the wider South East London area. They carry out boiler installations along with electrical, EPC and solar services.
- Boiler servicing and full boiler installations from £99
- Fixed quotes with no surprise fees at the end
- Fast booking with same day slots where possible
- Full care and support after boiler is fitted
- One team for all your boiler, electrical and solar needs
Different Types of Gas Boilers You Can Choose From
Before booking any of the above companies, it helps to know which boiler type is right for your home. Here are three main options:
- Combi boilers: These are small and simple. They provide both hot water and heating from a single unit, and they don’t need a separate tank. Combi boilers work best for smaller homes and one-bathroom flats, where space is limited and hot water demand is low.
- Conventional boilers: Also called regular or heating-only boilers, they require a separate water tank and cylinder. They are suitable for larger or older homes with more than one bathroom, and they work well with older pipework that can’t handle the high pressure.
- System boilers: These are best for larger homes with high hot water demand. They work with a hot water cylinder but don’t need a tank in the loft. They provide constant water pressure to multiple taps at once, which is great for busy family homes.
Your engineer will help you choose the right hot water, based on the size of your home, the number of radiators and how much hot water your family uses each day. Choosing the wrong hot water can waste energy and increase your bill, so always trust expert advice.
Key Benefits of Installing a New Boiler in 2026
A new boiler is a smart upgrade for any home. It saves money, provides better comfort and helps the planet too. Here are the top benefits you can expect:
- Lower energy bills: A-rated boilers use much less gas than older models, reducing your monthly energy costs. You could save up to £180 a year by switching from a D-rated to an A-rated boiler.
- Endless hot water: A combi boiler provides a constant flow of hot water on demand, so you never run out during a shower.
- Better water pressure: Showers and taps work stronger and faster with a new boiler.
- Smaller carbon footprint: Modern eco-friendly boilers help you use less fuel and reduce your CO2 output, which is better for the planet.
- Smart heating control: Many new boilers work with smart thermostats like Hive, Nest and tado°, so you can control your heating from your phone even when you’re away.
- Fewer breakdowns: New boilers come with longer warranties, so you spend less on repairs and call-outs.
- Higher home value: A working A-rated boiler increases the value if you’re planning to sell your home.
- Quieter running: Modern boilers run quieter than older units, meaning less banging or rattling in the kitchen.
How to Choose the Right Boiler Installer in London
Not all installers are the same. Here are a few things to check before signing a contract:
- Make sure the engineer is on the Gas Safe Register (you can check the name and licence online for free)
- Ask about the manufacturer’s warranty, as some brands offer warranties of up to 10 or 12 years
- Trustpilot, Google, CheckTrade, or what? See customer reviews on Trusted Trader
- Ask about service and maintenance plans for years after installation
- Get three fixed-price quotes so you can compare fairly
- Check if they offer financing options so you can spread the cost without a large upfront payment
- Ask about a workmanship warranty in addition to the manufacturer’s warranty
- Confirm what’s included in the price (magnetic filter, chemical flush, thermostat, etc.)
A reliable installer will always be open about price, timeline, and care. If a company feels pressured, hides fees, or refuses to provide a written quote, walk away and choose someone else.
Why Prime Time Boilers is The Right Choice For 2026
Every company on this list offers strong service, but Prime Time Boilers stands out for its blend of quality, honest pricing, and thorough care. Their engineers focus on getting the job done right the first time, and they back every install with an industry-leading 12-year manufacturer’s warranty and 24-month workmanship warranty.
What really sets them apart is the extra value packed into every install. You get a free Honeywell Smart Thermostat, magnetic filter, limescale filter and full chemical flush as standard for the £300 price tag. That’s hundreds of pounds in savings compared to many other installers in London.
Whether you live in Essex, East London or the wider Home Counties, their team are on hand to help with a free home survey and clear, no-pressure quote. From small combi swaps to full system upgrades, they treat every job with the same level of care and expertise. Their FCA-regulated finance also means you can start heating your home for as little as £9.99 per month.
Conclusion
A new boiler is the best upgrade you can make in 2026. It cuts your bills, keeps your home warm, adds value to your property and helps the planet at the same time. The 10 companies on this list are trusted names in the London boiler market, and each brings something unique to the table.
However, Prime Time Boilers takes the top spot for their honest pricing, top-brand A-rated boilers, class-leading warranties and warm customer service. If you want peace of mind and an easy installation from start to finish, they are a safe choice for your next boiler upgrade in London or the surrounding areas.
