Concealed room-sealed boiler flues
Important advice for consumers who have flues which are
concealed within ceiling spaces etc
Some properties, mainly flats and apartments, have been built
with boiler flues which cannot be inspected because they are hidden
behind walls or ceilings. The boiler flues that this information
relates to are connected to room-sealed fan assisted boilers only.
If you live in one of these homes then please read on for
more information so you know what to do.
Gas Safe registered engineers need to be able to see the flue −
which take fumes away from the boiler − as part of essential safety
checks whenever the boiler is worked on. A flue in poor condition,
combined with a room-sealed boiler that is not working properly,
could put you and your family in danger from carbon monoxide poisoning, which can cause death
or serious injury.
If your room-sealed boiler is situated on an outside wall, it is
unlikely you have this type of flue. Alternatively, if your
engineer can examine all of the flue, you will not need to take any
further action in relation to this matter.
If you do have a room-sealed boiler where all, or part of, the
flue cannot be seen, you, or your landlord, will need to arrange
for inspection hatches to be fitted. This does not mean
that your flue system is suddenly unsafe.
Room sensing carbon monoxide alarms are not an alternative to
being able to see the flue and you will still need to have
inspection hatches fitted so that the flue system can be checked.
It is recommended that inspection hatches are fitted as soon as you
are able to do so. From 1 January 2013, any Gas
Safe registered engineer will classify the boiler as At Risk, this
means that they will turn the boiler off, with your permission, and
formally advise you not to use it until inspection hatches have
been fitted in appropriate places.
Although most of the affected room-sealed boiler flue systems
are relatively new (installed since 2000), the risk of faults
leading to the release of carbon monoxide increases as the system
gets older, especially if it is not serviced regularly. It is
important that you have your gas appliances safety checked annually. .
You need to take action now
If you think the flue system serving your room sealed boiler is
concealed in this way you should have it checked by a registered
gas engineer who will be able to check it is safe and assess the
installation and be able to provide you with advice on inspection
hatches etc. If your property is less than two years old then
contact your builder. If your property is between two and ten years
old contact your home warranty provider, as you may be covered by
them if there are defects in the flue. A list of the main home
warranty providers is shown below. If your property is 10 years or
older you should contact a Gas Safe
If you are a tenant, it is the responsibility of your landlord
to ensure that the boiler is checked every year and the flue is
able to be examined.
If you have any questions please see the list of Frequently Asked Questions. If you have a
specific enquiry e.g. around building warranties please direct it
one of the groups listed below.
For any additional enquiries not answered through these routes
please send questions to: firstname.lastname@example.org
and it will be dealt with by a member of the group
To find a Gas Safe registered engineer in your
List of main home warranty providers:
This advice has been developed by the Flues in Voids cross-industry
team. It is made up of representatives of Gas Safe Register, house
builders, home warranty providers, registered gas engineers,
appliance manufacturers (including HHIC) and others and assisted by
HSE, to provide clear communication to industry and consumers
around the issue of concealed flues which do not allow
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