Boiler Installation London — New Boiler Supply & Fit, All Boroughs

New Boiler Installation in London — Your Local Gas Engineer Handles Everything

If your boiler has reached the end of its life, or if you are moving to a new property and want to start fresh with a reliable, efficient system, we handle the whole process. Supply, delivery, removal of the old unit, installation, commissioning, gas safety certificate, building regulations notification and a full system flush before we leave.

Your local gas engineer from 247 Plumber London installs boilers across the whole of London, from conversion flats in Brixton to new builds in Canary Wharf, Victorian terraces in Stoke Newington to purpose built estates in Barking. We know London properties and we know what works in each type of building.

Which Boiler is Right for Your London Property?

Combi Boilers

A combination boiler heats water on demand without a separate hot water cylinder or cold water tank. It is the most popular boiler type in London because it is compact, efficient and works well in flats and smaller properties where space is at a premium. A combi boiler delivers hot water instantly at the tap rather than waiting for a cylinder to heat. It also responds to the central heating demand directly, firing up when the thermostat calls for heat.

The main consideration with a combi boiler is the incoming mains pressure. In London, mains pressure varies considerably between areas. Some properties, particularly ground floor flats in older converted houses, have low incoming pressure that a combi boiler will struggle to work well with. We check your incoming pressure before recommending a combi to make sure you will actually get good flow rates at the shower and taps.

London’s hard water is tough on combi boilers. The plate heat exchanger inside a combi boiler is exposed to the full mineral content of the mains water supply, and in hard water areas like Southwark, Lambeth and Westminster, scale builds up quickly without a scale reducer or water softener fitted. We always discuss this on installation in hard water areas and can fit a scale reducer inline on the cold feed as part of the installation.

System Boilers

A system boiler works with a separate hot water cylinder, usually installed in an airing cupboard. The boiler heats water and stores it in the cylinder ready for use, rather than heating on demand like a combi. System boilers suit larger London properties where hot water demand is high. A family home with three or four bathrooms needs hot water available simultaneously at multiple points. A cylinder with good capacity handles this comfortably while a combi boiler struggles to keep up.

System boilers also suit properties where solar thermal collectors are installed on the roof. The solar coil in the cylinder preheats the water before the boiler tops it up, reducing gas consumption significantly. This is particularly relevant in London’s Victorian terraces and Edwardian semis with south facing roof slopes that get good solar exposure.

Heat Only Boilers

A heat only boiler, sometimes called a conventional or regular boiler, works with both a hot water cylinder and a cold water storage tank, usually in the loft. This is the original boiler configuration in most Victorian and Edwardian London houses. If you have this system currently and it is working well, we can replace the boiler itself without changing the cylinder or tanks, which keeps the installation cost down. If you want to modernise to a system or combi setup, we can do that as a full system replacement.

Boiler Brands We Install

We supply and install boilers from all the leading manufacturers. Vaillant EcoTEC boilers are among the most reliable and efficient combi and system boilers available and they carry a long manufacturer warranty when installed by a registered Vaillant engineer. Worcester Bosch Greenstar boilers are consistently rated among the best for reliability and performance, particularly in hard water conditions. Ideal Logic and Vogue boilers offer excellent value with strong warranty packages. Baxi Platinum series is a solid choice for properties where budget is the primary consideration without compromising on reliability. We can discuss the options for your specific property and recommend the model that makes the most sense.

What is Included in a Boiler Installation

A complete boiler installation from 247 Plumber London includes removal and safe disposal of the old boiler, supply and installation of the new boiler, a full system flush to remove sludge and debris before the new boiler goes in, fitting of a magnetic filter to protect the new boiler from returning sludge, commissioning to the manufacturer’s specifications, a Gas Safe certificate issued by our registered engineer, and notification to Building Control as required by regulations.

We also set up the controls for you. We can fit a new programmable room thermostat or smart thermostat at the same time, including wireless thermostats from Hive, Nest, Honeywell and others. We run through how the system works before we leave so you know how to get the most out of it.

Full System Flush Before Installation

This is one of the most important parts of any boiler installation and one that too many installers skip. Fitting a new boiler onto a dirty system full of sludge and debris is one of the main reasons new boilers fail prematurely. We carry out a full power flush of the system before the new boiler goes in, cleaning every radiator and every section of pipe. We then add a corrosion inhibitor to protect the system going forward and fit a magnetic filter to the return pipe to capture any particles that continue to come loose.

In London properties with old iron radiators and long pipe runs, the amount of sludge that comes out during a power flush can be significant. The water that comes out is often black as ink and thick with iron oxide particles. Cleaning all of this out before the new boiler connects is the difference between a boiler that performs well for fifteen years and one that starts having problems within three.

Landlord Boiler Installations

London landlords have specific obligations around heating provision. We work with landlords across the whole of London to replace end of life boilers in rental properties quickly and to the required standard. We provide all Gas Safe documentation, the building regulations notification, and a written handover pack that you can give to your tenants and retain for your own records. We also offer priority scheduling for landlords who manage multiple properties and need a responsive local engineer they can rely on.

Frequently Asked Questions

How long does a boiler installation take?

A straightforward combi boiler replacement in the same location typically takes one day. If we are moving the boiler, upgrading from a conventional system to a combi, or if pipework modifications are needed, it may take two days. We will give you a clear timeline when we quote.

Do I need to notify Building Control for a boiler installation?

Yes. Any new boiler installation in England and Wales must be notified to your local Building Control authority. As a Gas Safe registered company we handle this notification for you as part of the installation. You will receive a Building Regulations compliance certificate for your records.

How long should a new boiler last?

A quality boiler installed correctly, serviced annually and with the system properly treated should last twelve to fifteen years without major issues. The single biggest factor in boiler longevity is the quality of the installation, particularly the system flush and inhibitor treatment before fitting.

What warranty does a new boiler come with?

Most leading brands offer between five and ten years manufacturer warranty when installed by a registered engineer. Vaillant offers up to ten years on some models. Worcester Bosch offers up to ten years on Greenstar models. We will ensure your installation qualifies for the full warranty period available on your chosen boiler.