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New boiler installation in London property
Heating — London

Boiler
Installation
London.

A-rated boilers supplied and fitted from contact us for a quote. Worcester Bosch, Viessmann and Ideal boilers with manufacturer warranties up to 10 years. Most installations completed in a single day.

contact us for a quote
From, supply & fit
1 day
Typical installation
10 year
Warranty available
Our options
Every job is different. Contact us for a free quote tailored to your property.
Combi boiler — small property
1–2 bed flat or house, like-for-like replacement
Combi boiler — larger property
3–4 bed house, output matched to demand
System boiler with cylinder
Suitable for properties with multiple bathrooms
Full heating system overhaul
New boiler, radiators, pipework and controls
Air source heat pump
ECO4-eligible heat pump installation — may be fully funded for qualifying households
Request a free quote →

Congestion charge may apply for central London postcodes.

About boiler installations

A-rated
heating systems.

Modern A-rated condensing boilers are significantly more efficient than older G-rated systems, reducing heating bills and carbon emissions. We supply and install Worcester Bosch, Viessmann and Ideal boilers — manufacturers with some of the strongest warranty programmes in the market.

A like-for-like combi boiler replacement in a standard 1–3 bedroom property is typically completed within a single working day, with minimal disruption. More complex system changes or first-time central heating installations take longer and are priced individually.

All our boiler installations are carried out by qualified engineers and include commission and testing before we leave, as well as registration of the manufacturer warranty.

Why choose us

Why London
homeowners choose us.

01
A-rated efficiency

Every boiler we install is an A-rated condensing model. Replacing a G-rated boiler can reduce heating costs by up to 40%, with the saving factored into most payback calculations within 5–7 years.

02
10-year warranties

We supply Worcester Bosch and Viessmann boilers with manufacturer warranties of up to 10 years, provided the boiler is serviced annually. We carry out annual services to protect your warranty.

03
Same-day installation

Most like-for-like combi boiler replacements in 1–3 bedroom properties are completed in a single day, leaving you with a fully functioning heating system by evening.

04
Full system assessment

Before recommending a boiler, we assess your property's heat demand, existing pipework and radiator sizing to ensure the boiler specified is correctly matched — avoiding under- or over-sizing.

What's included

Everything in
one installation.

Supply & fit
Boiler supplied, installed and commissioned by our Gas Safe engineer — one fixed price
Old boiler removal
Existing boiler disconnected and disposed of responsibly at no extra charge
System flush
Power flush or chemical flush of the existing system before installation to protect the new boiler
Thermostatic controls
Smart thermostat or programmer supplied and configured as part of the installation
Flue installation
New flue run and terminal positioned to current regulations
Gas safety check
Full gas safety inspection of all appliances carried out as part of installation
Building regulations
All installations notified to your local authority under Part P and Gas Safe regulations
Warranty registration
Manufacturer warranty registered in your name from day one
How it works

Simple
process.

01
Free survey
We visit to assess your property's heating demand, check existing pipework and recommend the right boiler for your needs.
02
Fixed-price quote
You receive a written fixed-price quotation with no hidden costs. Old boiler removal and system flush are always included.
03
Installation day
Our Gas Safe engineer installs the new boiler, commissions the system and ensures everything is working before leaving.
04
Warranty registered
Your manufacturer warranty is registered in your name and we provide all documentation for your records.
Common questions

Questions
answered.

How long does a boiler installation take?
A standard like-for-like combi boiler replacement takes 6–8 hours. Most installations are complete within a single working day.
Do you remove the old boiler?
Yes — removal and responsible disposal of the old boiler is included in all our installation prices.
Which boiler brands do you install?
We primarily install Worcester Bosch, Viessmann and Ideal. We can also install other leading brands on request. We recommend Worcester Bosch for most domestic applications due to their extensive service network and warranty terms.
Do I need a power flush?
If your existing heating system has older radiators with sludge build-up, a power flush significantly extends the life of the new boiler and protects the warranty. We assess this during the survey visit.
Is the installation covered by building regulations?
Yes — all boiler installations are notified to Building Control under Part J of the Building Regulations and Gas Safe regulations. You receive a certificate as proof of compliance.
London-wide service

Get a quote for
your new boiler.

Get in touch

Request a callback.

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Message us
Call GMAS — 07498 597339