Boiler Installation Guide

Boiler installation guide

Boiler installation – Next-day gas boiler installs nationwide in ther UK

worceser 4000 installation

This guide will ensure you get the best boiler installation possible and also what to look for and ask for in a quote if you require a replacement boiler at Boiler Central.

Get a fixed price on a boiler online here using this free quotation tool

Boiler installation is really easy for an experienced Gas Safe boiler engineer from Boiler Central, as we install so many new boilers across the UK every day (except Christmas day).

The largest part of any boiler replacement cost is the time it takes for a heating engineer to fit your boiler.

The longer it takes to fit, the higher the labour costs will be, so you want to ensure you get the right people for the job.

Sold already, check out the best combi boilers available in the UK, ready for installation in your home now with Boiler Central.

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Watch our boiler installation video for everything you need to know about getting a new boiler in your home

What is gas boiler installation?

viessmann vitodens 050-w installation

Boiler installation involves putting a new boiler in replacement of an old one as well as reconnecting the pipes, water inlet, and a new boiler flue installed therefore, If you have any external water tanks, you may need these reconnecting or disconnecting.

Installation time will take between 1 to 3 days, dependent on the amount of work required.

Get a price on a boiler online here using this free quotation tool

If you’ve got a broken boiler then you are clearly going to need your new boiler installed as quickly as possible, find out now which dates we have available in your area, there is a good chance we can fit the boiler tomorrow if it is before 2 pm!

Installation, fitting, replacement, ripping out, and putting in a boiler all mean the same thing, but whatever you call it, ensure you get the best

Does a Gas Safe registered installer have to fit the boiler?

gas safe

Yes, it is against regulations for anyone who isn’t suitably qualified to fit a gas boiler.

Getting a new boiler may be the best option if you are having issues with your current boiler.

till, when it comes to new boilers and the installation process, there’s a lot to learn and the only people who should be installing a new boiler must be a Gas Safe registered heating engineer.

Gas Safe registered boiler installers are highly trained and have to prove they can install a boiler effectively and safely for your protection and this guide on boiler installation will give you everything you need to know to order a boiler.

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What are the different types of boilers you can have installed?

ideal logic combi boiler

Did you know that different types of boilers can be installed so you can choose from various heating systems for your home?

The type you should choose depends on your individual needs and your home and the three varieties of boilers that are fitted in the UK are:

  • Regular/heat-only boiler
  • System boiler
  • Combi boiler

Choosing the correct type of replacement boiler to fit in your home is arguably one of the most significant decisions you can make.

Boiler Central are with your every step of the way from the very first click on our website, right to you signing off and us registering your warranty for you after the Gas Safe engineer has completed the work.

Different types of boiler installations in the UK

If you’re looking for a boiler replacement, you have a range of options when replacing a boiler and here is a list of potentially different types of installation that you can choose when changing your boiler.

  • New boiler installation – like for like swap
  • Boiler conversion – hanging from one boiler type to another
  • New boiler and relocation – moving your boiler to the same room or another room
  • Boiler conversion with relocation – changing your boiler type and moving your boiler
  • Back boiler removal with conversion – you cannot replace a back boiler

As you can see, you do have more than just the option of boiler replacement, you could move your boiler or change from a system boiler to a combi boiler if you think it would be more energy-efficient and better for your home.

Conversions and relocations are more expensive due to the time they take a Gas Safe registered engineer to complete and the extra pipework and fittings required.

New boiler & central heating installation


The boiler is the main part of your central heating system. It is like the heartbeat of the home pumping hot water around your home, ensuring that every radiator at every extremity is kept at the perfect temperature to heat each room, especially If you have a really old central heating system with inefficient radiators that do not transfer heat as well as newer radiators, then it may be time to consider an upgrade and get a full central heating replacement.

At Boiler Central, you can get a full and fixed price quote on a new boiler installation, energy-efficient radiators, thermostatic radiator valves, a smart thermostat, a system cleanse, magnetic filter, and a boiler cover or service plan to ensure maximum energy efficiency all year round.

You really can get all this at a fixed price, so contact us now for the latest and best boilers and full central heating replacements.

Installing a brand new boiler to an old central heating system is like putting a modern engine in a rusting Fiat Panda. As much as that sounds like fun.

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New combi boiler installation

The combi boiler, also known as a combination boiler, is popular because it combines a central heating boiler with a high-efficiency water heater and compact combi boilers are all the rage as they slot neatly into kitchen cupboards.

viessmann vitodens 100-w

These best condensing combi boilers can be installed in most homes in the UK and are by far the most popular type for small to medium-sized dwellings but if you have a larger home, however, we wouldn’t recommend installing a combi; you would be better with a system boiler.

The combination boiler comes in one compact unit, which can be installed in kitchen cupboards if small enough and most mid-range combis are designed this way so that they appeal to as many homes as possible.

Any good Gas Safe registered engineer can fit a combi boiler in a cupboard or tight space.

A combi boiler draws directly from the mains water, so there is no need for a separate storage tank for hot or cold water and if you have a boiler with a hot water cylinder or cold water tank, you can always choose to convert from one type of boiler to a combi.

This is one of the most popular types of installation in the UK right now.

Installing a gas combi boiler in your home

Installing a new combi boiler in your home is one of the most effective ways to save money on your utility bills and if you already have a combi boiler and want a new combi boiler installed in replacement of your old one, then expect this to take no longer than one day to fit.

tools for installation of boiler

If you have a system boiler and want to convert it to a combi boiler to remove your hot water tank, this can take up to 2 days and as you can imagine system-to-combi boiler conversion is very popular in the UK right now.

If you have an old G-rated gas back boiler, then replacing it with a new boiler this can save you up to £580 per year on your gas bill.

This makes a combi boiler swap worthwhile as you can recoup the financial outlay in as little as three years.

Looking for combi boiler installers? Here at Boiler Central, we specialise in installing gas boilers of every type, we fit thousands of boilers every year so we know exactly what we are doing and with thousands of satisfied customers as per our reviews on all the top review sites.

Find out what the best combi boiler is here.

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New Regular boiler installation

worcester greenstar ri conventional boiler

A regular boiler—also known as a conventional boiler, heat-only, or traditional model—is standard with older residential properties and with a regular boiler, you will have both a hot water cylinder and a separate cold storage tank either in the loft or at height in your home.

If you have an older home, you may need to continue using this type as it is easier and less inconvenient to keep your existing installation and it is also a good idea to take note of the water pressure that is coming into your home.

Installing a regular gas boiler in your home

If you already have a regular boiler and a hot and cold water tank then a new regular boiler can easily be installed to work with these and his type of installation will be quick and easy if just replacing your old one and will take the heating engineer around a day to complete.

If you require new hot water tanks or cold water tanks, expect the regular boiler replacement to take longer, but it may take up to two days to complete the full removal of the old boiler, the water tank, and the fitting of the new tanks.

It’s crucial to note that these conventional boilers don’t do well with high water pressure, but they are great for distribution and this variety allows you to run hot water at once to more than one outlet if you live in a larger household.

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New System boiler installation

vaillant ecotec system boiler

Like the traditional type, the system boiler also requires a hot water cylinder. But with this variety, you’ll find that most of its critical components and features are part of the system boiler itself and for this reason, they are often easy to install.

System boilers also requires less space due to the fact there is no cold-water tank.

You still, however, need to have space for the hot water tank, and ideally, you should already have a hot water tank if you are wanting a system boiler installation but if you don’t have a hot water tank you have a combi boiler or will need a combi boiler installing otherwise.

If you have a large home, replacing a system boiler with another is the best way to ensure a smooth and quick service, whereas if you plan on changing expect it to take up to two days – it could take less, but that is that is speaking from experience here at Boiler Central

Due to the stringent regulation of gas & installations, we are lucky to not have many accidents in the UK. Gas Safe is your protection.

Installing a gas system boiler in your home

If you already have a system boiler, then installing a new one as a replacement will be the most cost-effective way and should take around a day to fit, and if you already have a hot water tank then a new system boiler will work with this also, your Gas Safe engineer will just plumb this backup and you can continue to get bucket loads of hot water to multiple outlets as and when required.

It can just be installed and plumbed into work as your old system boiler would have done. If you are requiring a new hot water tank then expect the fitting of the system boiler to take longer and a full system boiler installation with a new hot water tank may take up to 2 days due to the amount of work involved in the fitting process.

Get a price on a boiler online here using this free quotation tool

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Q What kind of fuel does your boiler use?
Viessmann combi boiler

How long does it take to install a gas boiler?

Installing or fitting a new boiler isn’t a quick job, it can’t be done in a few hours as installation needs to be done properly and safely and once a gas boiler is fitted, there are also safety checks to be completed by the installer.

Take a look at our quick guide to see how long each different type of installation will take and if your installation choice is going to take a few days, we recommend that the best time to install a boiler is in the summer.

Combi boiler installation1 day
New combi boiler installation with relocation1-2 days
System to combi boiler conversion1-2 days
New system boiler installation1 day
System boiler installation with relocation1-2 days
New regular boiler installation1 day
Regular boiler installation with relocation1-2 days
Regular boiler to combi boiler conversion1-2 days
Back boiler to a combi boiler conversion2-3 days

How much is a boiler installation?

When customers want to install a new boiler system, one of the most common subjects they broach is the price, specifically, how much do new boilers cost?

boiler installation prices

This question is crucial, and the answer is going to be different for everyone looking for new boiler deals for example, the price often depends on the brand as Worcester Bosch boilers may differ from Viessmann and so on.

It also depends on which of the three varieties you choose.

For example, our customers frequently ask, “How much is a new gas boiler?”

Compared to other types of boilers, gas boilers are usually the most common type besides oil-based ones and other things that affect buying boilers new include what parts are needed, where you live, unit availability, and more, however here at Boiler Central, we offer you quality boiler quotes and flexible monthly payment options when you need them.

Location location location – Unfortunately though as per the UK standard, boiler installation in London costs more than the rest of the country due the higher hourly rate charged by engineers in the city.

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Boiler installation guide

What boilers are available for installations in the UK?

If you are looking for a new boiler to install, then you have a wide range of products from a wide range of manufacturers such as Worcester Bosch, Viessmann, Ideal, Baxi, Alpha & more.

Here at Boiler Central we fit the best combi boilers from the top manufacturers and we don’t sell every boiler, as there are many that aren’t very good and If you want a particular boiler that we don’t have on our site, however, you can request a manual quote and ask for us to install it for you.

Here is a quick list of the best combi boilers that we can install in your home in under 24 hours:

Cost of a boiler installation in the UK

When it comes to the cost of a new boiler and installation, you also want to compare units in the same category, such as combi boilers, system boilers etc, and always have a look at some of the factors that you’ll need to consider and some additional perks that may come up in your research like a free smart thermostat.

You can, however also get 12 years warranty for the price of 10 included in the new boiler cost exclusively when you get your boiler installed by Boiler Central. Some companies throw in unnecessary extras, and it isn’t likely that you will need all these extras when you install a new boiler system.

Get a price on a boiler installation online here using this free quotation tool

When your comparing boilers online, you are also comparing the replacement company. Make sure you get the full works

Boiler fitting – How long does it take?

time to fit boiler

Boiler fitting takes different times to install due to such a varied workload required for each particular home type and also the type of boiler being fitted.

If you have a combi boiler installed and replacing an existing combi boiler, this should take 3-6 hours to fit. If you have a system boiler currently and would like to convert to a combi boiler.

This takes 1-2 days due to the installation requiring much more work to convert the system.

A system boiler replaced with a new system boiler would be 3-6 hours and, lastly, a back boiler to combi or system boiler would take 1-2 days on average for the boiler fitting

Next-day installation in the UK

Next-day boiler installation is very common now in the UK. You can easily choose your new boiler online and book a date with a Gas Safe registered engineer, and the best bit about Boiler Central is all this can be done online, and you get a fixed price quote.

You can use our online quote calculator that gives you an accurate and fixed price on your screen in 20 seconds and don’t worry about the simplicity of it all, this is how things are done these days. We have installed over 15,000 boilers this way, so we’re obviously doing something right!


Getting a next-day boiler installation quote

You can get next-day boiler installation with Boiler Central if you order your boiler before 12 pm during the colder months and 2 pm in the warmer months.

This is great if you need an emergency boiler replacement due to a broken boiler.

This is next-day fitting nationwide in England, Wales, and Scotland, so you do not have to be without heating for too long, even in the depths of winter.

Not many boiler companies can fit a boiler at such short notice nationwide so if you do require a boiler urgently, get a fixed quote online here in 20 seconds.

New gas boiler regulations

The UK has passed several government guidelines for boiler installation and energy efficiency, which need to be adhered to for all boiler replacement, so remember:

  • If you have a gas boiler, it must have at least a 92% ErP efficiency regardless of boiler type
  • A combi boiler requires one energy-saving feature
  • You must have functioning time and temperature controls

If you are a landlord and looking for a new energy-efficient boiler for one of your rental properties, check out our boilers for landlords guide. That even includes a great offer on multiple installations

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Financing your gas boiler install


Getting a new boiler installed is an investment. You may not have the money on hand for the services you need so some people may turn to a credit broker or go directly to financial institutions to get connected with a loan.

At Boiler Central, we provide various financial payment services, from card to boiler finance.

For new boiler, you can pay by card, pay zero deposit, and pay monthly for 2 to 10 years. This is excellent news if you want a better boiler in your home with a more extended warranty.

Warranty is so essential with boilers, and we will register it for you; all you have to do is get your boiler serviced every year after the installation date.

Don’t be stressed by hydrogen. It is likely the saviour and remember, oil, natural gas and other fossil fuels were once new

Can a Gas Safe engineer install a hydrogen boiler?

With gas boilers being banned in 2025, boiler installation companies only install hydrogen-ready boilers to 20% blend.

The best thing is that there is only a slight difference in these boilers so a suitably trained Gas Safe heating engineer can easily install a hydrogen-ready boiler in your home.

boiler installation guarantee

If there ever becomes a point where the gas network is changed to hydrogen in the future, then these types of boilers can easily be amended with a small amount of training from the engineer and a small part change on the boiler.

Nearly every boiler installed in the UK now is hydrogen-ready, especially boilers in new build homes.

If you have had a boiler fitted in the past year or so, likely, your boiler is already capable of running on a mix of hydrogen and natural gas.

All the top manufacturers, such as Worcester Bosch, Viessmann, Ideal, Baxi, and more, only make H2-ready boilers.

Find out why hydrogen fuel is likely to be the future of home heating in years to come and why you should be prepared!

Why choose Boiler Central for your boiler installation?

You can price up and buy a new boiler online

If you need a new boiler and installation, don’t hesitate to contact our award-winning Boiler Central team for more information.

If you would like a new boiler quote, you can get everything from Boiler Central. We install nationwide with next-day fitting if you order by 2 pm.

At Boiler Central, we know pretty much everything about boiler services and boiler replacement, so feel free to ask if you have any questions. Call 0808 156 3888 or choose your fuel type below to get an online price in seconds:

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