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Replacing your boiler

Replacing your old boiler represents a considerable investment, so it's important to make sure your new boiler is the right one for your home, your family and your lifestyle.

The first and most important decision is who is going to install your new boiler. Please remember that it is illegal for anyone who is not Gas Safe registered to work on a gas appliance of any kind. Gas safe registered engineers have been checked to make sure they are competent and safe to do your work.

If someone other than a Gas Safe registered engineer does the gas work in your home, you could be risking the safety of your family and your property. Badly fitted and poorly serviced gas appliances can cause gas leaks, fires, explosions and carbon monoxide poisoning.

You can find out more about Gas Safe here.

Here are a few suggestions to consider before you make your final decision.

Who should install my boiler?

Your new boiler, or any other gas appliance for that matter, should be installed by a Gas Safe registered engineer. All the installers on Find an Installer are Gas Safe registered and have been trained to work on Baxi boilers.

We suggest you ask your family, friends and colleagues for recommendations. Ask if they have been happy with the workmanship and even ask to see for yourself.
Always remember to ask them to show their Gas Safe card - they will be happy to show you - and if you are in any doubt, you can check their ID number on the Gas Safe website.

Get several quotes

We recommend you ask three installers to come and survey your property and give you a quote for the work. Cheapest is not always best. Ask if the quote includes a power flush to clean all the sludge and dirt out of your heating system. You really don't want your brand new boiler fitted pipes full of sludge that could cause you problems before you even start!

The installers you choose should do a survey of your home, look at the number of radiators, ask about your hot water needs, see if you have the right controls and check to see what sort of insulation and windows you have. Then they can calculate the heat loss of your home and make sure the boiler they 'prescribe' will keep you warm and comfortable, and be energy efficient and cost effective.

Replacing like with like?

Very often a new, energy efficient version of your existing boiler is the right replacement. However, if you have an old heat only boiler, with tanks in the loft and a water cylinder in the airing cupboard, you may want to consider changing to a system boiler, with no tanks in the loft, or even a combi boiler that doesn't need a hot water cylinder at all.

The other reason you may need something different is if you have had an extension or conservatory built and have had more radiators fitted.  Your installer can take this into consideration when they do the survey of your home.

What output do I need?

Your installer will be able to work out the right output of boiler when they do the survey of your home. Tell them if your current boiler does not keep you warm enough or doesn't provide enough hot water. It may be because it is old and inefficient or it may just not be powerful enough for your needs. 

If you have several bathrooms, you may want to consider having a system or heat only boiler instead of a combi boiler, which can only supply a one hot tap at a time.

Where should my new boiler be installed?

In most cases, new boilers are installed where the old one used to be. This means the hole for the flue and all the pipework is in the right place. However, in some cases you may wish to choose a new home for your boiler. Please remember that this could increase costs because pipes will need to be moved and a new hole drilled for the flue.

We have some information on where it is safe to install your boiler here

What about controls?

When they come to give you a quote, ask your installer about controls. At the very least, you should have a timer, room thermostat and thermostatic radiator valves.  Having the right controls (and knowing how to use them properly!) can make your home even more comfortable and energy efficient. A room thermostat and thermostatic radiator valves could save you up to £165 a year on your heating bills, according to the Energy Saving Trust.

Information & advice
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