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Installing a wall-mounted gas boiler presents no par-
ticular difficulty.
The installation of the boiler must be carried out by
a competent person in accordance with the relevant
requirements of the Gas Safety (Installation and
Use) Regulations, Building Regulations, Model Wa-
ter Byelaws and the Building Standards (Scotland)
Regulations. It must also comply with the current
I.E.E. Wiring Regulations and the relevant recom-
mendations of the following British Standard Codes.
Regulations and the relevant recommendations of
the following British Standard Codes of Practice:
- CR331.3
Low pressure installation pipes.
- BS.5449.1
Forced circulation hot water systems.
- BS.5546
Installation of gas hot water supplies for domestic
purposes.
- BS.5440.1
Flues (for gas appliances of rated input not ex-
ceeding 60 kW).
- BS.5440.2
Air supply (for gas appliances of rated input not
exceeding 60 kW).
- BS.6798
Boilers of rated input not exceeding 60 kW.
Note
- The boiler is only suitable for installation in a
sealed system and must not be used with an
open vented system.
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The boiler can be installed on the inner face of an
extemal wall - and some intemal walls - providing
they are flat, vertical and capable of adequately sup-
porting the weight of the boiler and any ancillary
equipment.
The boiler may be installed in any room or intemal
space, although particular attention is drawn to the
requirements of the current I.E.E. Wiring Regula-
tions and, in Scotland, the electrical provisions of
the Building Regulations applicable in Scotland with
respect to the installation of the boiler in a room or
intemal space containing a bath or shower. Where
installation is in a room containing a bath or shower,
any electrical switch or boiler control utilizing mains
electricity should be situated so that it cannot be
touched by a person using the bath or shower.
Where installation will be in an unusual location,
special procedures may be necessary and BS.6798
gives detailed guidance on this subject.
A compartment used to enclose the boiler 0867be
designed and constructed specially for this purpose.
An existing cupboard or compartment may be used
provided it is modified for the purpose. Details of es-
sential features of cupboard/compartment design,
including airing cupboard installations, are given in
BS.6798.
In sitting the boiler, the following limitations 0867
be observed:
- The position selected for installation 0867allow
adequate space for servicing in front of the boiler
and for air circulation around the boiler.
- This position 0867also permit the provision of a
satisfactory balanced flue termination.
Note:
- If the boiler is to be fitted in a timber framed build-
ing, it should be Jitted in accordance with the Brit-
ish Gas publication "Guide for Gas Installations in
Timber Frame Housing". Reference DM2. If in
doubt, advice must be sought from the Local Gas
Region of British Gas.
When sitting the boiler, provision must be made for
the disposal of the condensate, see Section 4 -Con-
densate drain.
The pressure relief valve connection should be rout-
ed to an extemal, visible point where the discharge
of steam or water cannot create a hazard to persons
or property. BS.5449: 1 refers.
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Installation pipes should be fitted in accordance with
CP.331.3.
The complete installation must be tested for sound-
ness and purged in accordance with CR331.3.
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Detailed recommendations for flueing are given in
BS.5440.1. The following notes are intended for
general guidance.
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