2.1
STATUTORY REQUIREMENTS
GAS SAFETY (INSTALLATION AND USE) REGULATIONS (as
amended). It is the law that all gas appliances are installed by
a registered person, in accordance with the above regula-
tions. Failure to install appliances correctly could lead to pros-
ecution. It is in your own interest, and that of safety, to ensure
that the law is complied with.
In addition to the above regulations, this appliance must be
installed in accordance with the current IEE Wiring
Regulations (BS 7671), Local Building Regulations, the
Building Standards (Scotland) (Consolidation) Regulations,
Byelaws of the local water undertaking, and Health and Safety
Document No 635 ‘The Electricity at Work Regulations 1989’.
It should also be in accordance with the relevant recommen-
dations in the current editions of the following British
Standards and Codes of Practice: BS5449, BS5546,
BS5440:1, BS5440:2, BS6798, BS6891, and BG.DM2,
BS7074, and BS5482 for propane installations.
Manufacturer’s instructions must NOT be taken in any way
as over-riding statutory obligations.
2.2
BOILER POSITION
In siting the combination boiler, the following limitations MUST
be observed:
– The boiler is not suitable for external installation. The posi-
tion selected for installation should be within the building,
unless otherwise protected by a suitable enclosure, and
MUST allow adequate space for installation, servicing, and
operation of the appliance, and for air circulation around it
(section 2.4).
– This position MUST allow for a suitable flue termination to
be made. The combination boiler must be installed on a flat
vertical wall which is capable of supporting the weight of
the appliance, and any ancillary equipment.
– If the combination boiler is to be fitted in a timber framed
building it should be fitted in accordance with the Institute
of Gas Engineers document for Gas Installations In Timber
Frame Housing, Reference 16E/UP/7: 1998. If in doubt,
advice must be sought from the gas supplier
– If the appliance is installed in a room containing a bath or
shower, any electrical switch or control utilising mains elec-
tricity must be so situated that it cannot be touched by a
person using the bath or shower. Attention is drawn to the
requirements of the current I.E.E. Wiring Regulations (BS
7671), and in Scotland the electrical provisions of the
Building Regulations applicable in Scotland.
– A compartment used to enclose the appliance MUST be
designed and constructed specifically for this purpose. An
existing cupboard, or compartment, may be used provided
it is modified accordingly.
– Where installation will be in an unusual location, special
procedures may be necessary. BS6798 gives detailed
guidance on this aspect.
2.3
FLUE TERMINAL POSITION
Detailed recommendations for flue installation are given in
BS5440:1. The following notes are for general guidance:
– The boiler MUST be installed so that the terminal is
exposed to the external air.
– It is important that the position of the terminal allows free
passage of air across it at all times.
– It is ESSENTIAL TO ENSURE, in practice that products of
combustion discharging from the terminal cannot re-enter
the building, or any other adjacent building, through venti-
lators, windows, doors, other sources of natural air infil-
tration, or forced ventilation/air conditioning. If this does
occur, the appliance MUST be turned OFF IMMEDIATELY
and the gas supplier consulted.
– The minimum acceptable dimensions from the terminal to
obstructions and ventilation openings are specified in fig. 3.
– If the terminal discharges into a pathway or passageway
check that combustion products will not cause nuisance
and that the terminal will not obstruct the passageway.
– Where the lowest part of the terminal is fitted less than 2
m (78 in) above ground, above a balcony or above a flat
roof to which people have access, the terminal MUST be
4
2
GENERAL REQUIREMENTS FOR INSTALLATION
Terminal position
Directly below an openable window, air
vent or any other ventilation opening
Below guttering, drain pipes or soil pipes
Below eaves, balconies or carport roof
From vertical drain pipes or soil pipes
From internal or external corners
Above adjacent ground, roof or bal-
cony level
From a surface facing the terminal
From a terminal facing the terminal
From an opening in the carport (eg
door, window into dwelling)
Vertically from a terminal on the
same wall
Horizontally from a terminal on the
same wall
Adjacent to opening
A
B
C/D
E
F
G
H
I
J
K
L
M
Minimum spacing
300 mm
12 in
75 mm
3 in
200 mm
8 in
75 mm
3 in
300 mm
12 in
300 mm
12 in
600 mm
24 in
1,200 mm
48 in
1,200 mm
48 in
1,500 mm 60 in
300 mm
12 in
300 mm 12 in
TABLE 5
Fig. 3