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Gas Boiler Replacement in London
Powerful warmth when you need it
A modern A-rated gas boiler is significantly more efficient than units fitted ten or fifteen years ago, easier to control and quieter to run. Ecoworks has been replacing and installing boilers across London since 2013, and we fit market-leading A-rated boilers from both Mitsubishi and Vaillant.
Book your money-saving boiler upgrade today.
How Gas Boilers Work
Gas boilers burn natural gas to heat water, which is then circulated through radiators, underfloor heating or hot water systems.
Modern condensing boilers capture heat from exhaust gases, achieving higher efficiency and lower fuel consumption.
Choosing the Right Boiler
Selecting the correct boiler size and type is essential for consistent heating and energy efficiency. Our team advises on combi, system or regular boilers, ensuring the best solution for your property and usage needs. We provide market-leading A-rated boilers from both Mitsubishi & Vaillant.
Efficiency & Running Costs
New high-efficiency boilers reduce energy consumption, lowering fuel bills while maintaining reliable warmth. They are also compatible with smart controls for further savings.
When is it time to replace your boiler
The Energy Saving Trust suggests boilers should typically be considered for replacement after around 10 to 15 years, as efficiency drops noticeably with age.
Common signs your boiler may be due for replacement:
- Boiler is 12 years old or more
- Energy bills creeping up despite similar usage patterns
- Heating takes longer to come up to temperature
- Radiators are uneven, hot at the top and cold at the bottom (often a sign of sludge build-up)
- The boiler is noisy, kettling, banging or vibrating
- Repairs are becoming more frequent or more expensive
- Replacement parts are getting harder to source
Gas boiler replacement, end to end
A gas boiler replacement is a notifiable job under UK Building Regulations, so it must be carried out by a Gas Safe registered engineer and registered with Building Control through the Competent Person Scheme. Manufacturer warranties on A-rated boilers from brands like Vaillant and Mitsubishi typically run between 5 and 10 years when fitted by an accredited installer.
Installation Process
Our engineers carry out full surveys, remove old units safely, and install your new boiler with minimal disruption. Each installation is completed to the highest professional standards and thoroughly tested.
Servicing & Longevity
Annual servicing helps your boiler operate safely and efficiently for many years. We provide maintenance plans and prompt support to ensure peace of mind.
Get expert advice, tailored solutions, and a clear, no-obligation quote…
- More About Gas Boilers
Frequently Asked Questions
How long does a new gas boiler typically last?
Typically 10 to 15 years with annual servicing. Efficiency drops over time, so even a working older boiler may be costing more in gas than a replacement would save.
Do I need a boiler service every year?
Yes – annual servicing is required to maintain efficiency, keep your warranty valid and ensure safe operation.
Are A-rated boilers more efficient than older boilers?
Yes. All new gas boilers sold in the UK must hit at least 92 percent ErP efficiency, against around 70 to 80 percent for boilers more than 15 years old.
Can you replace my boiler in one day?
Yes – most like-for-like boiler swaps can be completed in a single day.
Do new gas boilers need to meet specific efficiency standards?
Yes – all new gas boilers installed in the UK must meet minimum efficiency requirements and comply with current building and safety regulations.
Can you do an oil boiler replacement?
If you are on oil and looking to switch, there are three sensible routes: a modern condensing oil boiler, a switch to mains gas if available at the property, or a switch to an air source heat pump. We can talk you through the trade-offs for your property on a survey visit.
How to choose an energy efficient boiler?
All new domestic gas boilers sold in the UK must achieve at least 92 percent ErP efficiency, which means almost all the gas burned is converted to heat in the home.
We are accredited installers for Vaillant A-rated boilers and we also fit Mitsubishi A-rated boilers.
Vaillant offers up to a 10 year guarantee on selected ecoTEC plus models when installed by Vaillant Advance accredited installers.
Why Ecoworks for your boiler replacement
- Gas Safe registered, every engineer, every job
- Vaillant accredited installer
- Mitsubishi A-rated boilers also available
- HIES accredited for consumer protection
- 5 year workmanship guarantee on every install
- 40+ years of heating experience under founder Mark Dearden
Do I need a power flush with a new boiler?
Not always, but often. A power flush removes sludge and limescale from existing radiators and pipework that would otherwise circulate into the new boiler and shorten its life. Some manufacturer warranties require a clean system as a condition. We check the system condition during the survey and let you know.