Boiler Installation & Replacement across London & Kent
Professional boiler installations and replacements from Gas Safe Registered engineers. Clear advice, quality workmanship and straightforward quotations for homes across London & Kent.
New boilers fitted from £1,650 · View prices
Gas Safe Registered
• Google - 4.7★
• Trustpilot - Excellent
• Worcester Bosch Installer
• Vaillant Advance Installer
• Free first service & wireless thermostat on selected installs – confirmed in your quote
What’s included with every installation
Every new boiler comes with the same full checklist, so you know exactly what you’re paying for.
✓ Free survey and fixed written quote
✓ Old boiler removed and disposed of
✓ System chemical clean and inhibitor (BS 7593)
✓ Power flush where needed – confirmed in your quote
✓ Magnetic system filter to catch sludge and protect the boiler
✓ Cold water scale reducer
✓ Heating controls – details confirmed in your written quote
✓ Radiators balanced so every room heats evenly
✓ Benchmark commissioning
✓ Building Regulations notification through Gas Safe
✓ Manufacturer guarantee registration
✓ Mains cold water flushed through
Boiler Types We Install
Combi Boilers
Regular / Conventional Boilers
Provides heating and hot water directly from one compact boiler, without a separate hot-water cylinder. Often suitable for smaller and medium-sized homes.
Works with a separate hot-water cylinder and can be well suited to homes with multiple bathrooms or higher hot-water demand.
Often suitable when replacing an existing traditional heating system that already uses a hot-water cylinder and cold-water storage tank.
Not sure which suits your home? Send us a few photos on WhatsApp and we’ll advise.
Why Choose GX7 for Your Installation?
Our own Gas Safe team
Our own team of four Gas Safe engineers (reg. 935610). No subcontractors.
G3 unvented qualified
We can legally installed and service unvented hot water cylinders.
Quality Workmanship
Careful installation, Dust sheets down, neat copper pipework and attention to detail throughout the job.
Worcester Bosch & Vaillant installers
Worcester Bosch Installer and Vaillant Advance Installer. Guarantees of up to 10 years or 12 years on selected models.
How Your Boiler Installation Works
1
Photos or survey
Send photos on WhatsApp for a quick quote on most combi swaps. For conversions and bigger jobs, we visit for a free survey.
2
Fixed written quote
The boiler, the work and the price in writing, with no hidden extras.
3
Installation
Most combi swaps take a day, conversions take longer. We’ll confirm timings and when you’ll be without heating in advance.
4
Commissioning & handover
Benchmark completed, guarantee registered, and your new controls explained before we leave.
5
Aftercare
An annual service keeps your guarantee valid. We’ll remind you when it’s due.
Boiler Brands & Manufacturer Warranties
We install boilers from leading manufacturers and can help you choose a suitable boiler for your home, heating requirements and budget.
Worcester Bosch Installer & Vaillant Advance Installer
5 Year Manufacturer Warranty Options
Available on selected manufacturer models.
10 Year Manufacturer Warranty Options
Available on selected manufacturer models.
Up to 12 Years Manufacturer Warranty
Available on selected boilers and subject to manufacturer terms.
Warranty length depends on the boiler manufacturer, model, installation requirements and manufacturer terms & conditions.
★★★★★
From start to finish, a very professional company. I had a new boiler fitted after a very cold New Year’s Eve. I was kept in the loop at every stage of the process; deciding on budget, convenience and quality and finally the timeline. I would definitely use them again. I am so pleased to have hot water and heating again.
Debby Phillips - Trust Pilot Review
What Our Customers Say
★★★★★
Harmeen and his team were very helpful throughout the renovation of my 2 bed flat. Changing the boiler, radiators and pipe work. He did things to a high standard and was very quick in responding to any extra requests I made. I’d definitely recommend
Junior Appiah - Google Review
★★★★★
Harmeen and his team did a marvellous job changing my new boiler on the 16/2/26.
He came on time and the job was completed the same day. I’m extremely impressed with the work carried out.
I will recommend his company Gx7 Ltd to anyone.
Majeedkhan - Trustpilot Review
Boiler Installation FAQs
Ready to Replace Your Boiler?
Get a straightforward quotation from our Gas Safe Registered heating engineers.
Gas Safe Registered
Clear Written Quotations
Manufacturer Warranties Available
We carry out combi conversions across South East London and North West Kent, including Grove Park, Lee, Eltham, Blackheath, Bromley, Chislehurst, Elmstead, Bickley, Petts Wood, Orpington, Chelsfield, Keston, Hayes, Beckenham, Sidcup, Sevenoaks, Otford and Westerham.
Get Your Boiler Installation Quote
Tell us a few details about your property and existing heating system. We'll review your requirements and contact you to discuss the most suitable next steps.
Get a straightforward quotation from our Gas Safe Registered heating engineers.