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what happens when a boiler is fitted?
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Many of us will not be sure what happens when a boiler is fitted. We at HomeSage know that the decision process of finding the right boiler for your, and then getting it fitted, can altogether be a long and difficult task to complete, so it might help for you to understand the process. 

It can take a while to make a decision over what type of boiler you want and how it will suit your home. One thing we do know is that a boiler is not an appliance you can afford to cut corners with when it comes to installation. A reliable and efficient boiler will improve your home and save you money in the long term.

So hopefully this article will help to explain what happens when a boiler is fitted and what information will be useful to you.

What happens when a boiler is fitted?

Not all gas engineers will work in exactly the same way when it comes to installing your boiler. Although there are a few things that you would expect to happen when a boiler is fitted. Here are some steps that we can expect a gas engineer to follow:

No mess

This perhaps comes under politeness more than it does gas engineer training, but your installer should make sure that they don’t leave a mess whilst fitting out your boiler. Engineers are clean folks and they usually clean up after themselves!

Preliminary checks

Your gas engineer will be keen to check a few things before he gets to work. In particular the current whereabouts of your boiler and flue. Furthermore they will probably want to count the number of radiators and bathrooms in the house to see the nature of the beat they are dealing with. 

Water pressure

They will most likely want to see what your water pressure currently is before they get started. This can give them an insight into the water pressure in the area and helps them decide how best to approach the installation. 


Your engineer should hopefully check the newly fitted boiler just to double check that everything is in order and should be ready for you to use.

Building regulations certificate

In order to meet building and gas safe rules, gas safe services are required to notify the local authorities when they install a new gas appliance. It is imperative that you query about a building regulations certificate when your work has been finished.

Benchmark certificate

Likewise you should make sure of a benchmark certificate in addition. Getting the right documentation to match your newly installed boiler is just as important.


Providing a warranty for the boiler is an indication that the business installing your boiler is a reputable one. If you use our service to match you with a great installer then you won’t need to worry!

How long will it take to fit my boiler?

The length of time it takes to fit a boiler depends on the demands of the task.

A simple fitting, such as replacing an old or faulty combi boiler with a new one, is a relatively simple task that you can expect to be completed on the day. However, if it is a much more complex operation that involves a complete overhaul of your boiler system this will invariably take a bit longer to complete.

Here is our own guide designed to give you some estimates as to how long it can take for a new boiler to be put in.

How much will a boiler installation cost?

Again, the cost of your boiler being fitted will depend very much on the scale of the operation. A complete change of system fitted with a power flush boiler will cost you more than replacing your current model.

HomeSage’s boiler search tool can tell you exactly how much your installation will cost and compares different services to help you find the best price.

And here is some information on the average cost of a new boiler and how much you can expect to pay.

What happens if my boiler is not fitted properly?

If you believe that your boiler has not been fitted properly and therefore is not working, then here are some steps you can take to follow it up. HomeSage provides boiler quotes from firms that use highly-trained and trusted engineers, consequently a botched job is very unlikely to happen from our partners!

You may have underlying issues that can lead to a malfunctioning boiler. These are 10 of the most common boiler problems that you might face.

A leaking boiler in particular can be indicative of a few issues.

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What happens when different boilers are fitted?

In the United Kingdom, boilers tend to come in 3 distinct types – the conventional, the combi and the system boiler. They have different requirements for being installed.

The combi boiler

A combi, or combination boiler, is by far the most commonly installed kind of boiler. It’s a dual system that can control both the hot water for baths and wash basins, plus the heating for your house. When you have one of these installed, it’ll just be one small, compact unit. HomeSage has much more information of combi boilers to help with your decision. 

The conventional boiler

As the name would suggest this is the classic style of boiler. For this kind of boiler, a hot water storage cylinder and a water tank would need to be installed.

A conventional boiler is usually for large and old houses, so those that need one normally already have a system boiler in place. If you are wondering whether to replace your system boiler with a combi one, The Green Age has helpfully weighed up the two options for you.

The system boiler

The difference with a system boiler is that it consists of a boiler (normally installed on a wall) and a cylinder (most likely installed in a concealed location, like a cupboard). The major heating and hot water system components are built in to the main boiler, with the cylinder serving as water storage. 

Can we help?

And with that, hopefully you’re a bit more knowledgeable about what happens when a boiler is fitted! If you’re still unsure what boiler you want to go for, we can help you out. Here are some of the best selling boilers of 2020 that could be installed in your home. Contact us and you could save up to 54% on


Patrick is a content author at HomeSage. After leaving Leeds University in 2019, he discovered a passion for writing. His main hobbies include football, cricket, quizzing and, of course, boilers!