The conversion of net efficiency to gross was achieved by multiplying the net
efficiency by the following conversion factor from Table E3 of SAP 2005, rounding
down to the nearest whole number.
4. GENERAL INSTALLATION REQUIREMENTS
4.1 The installation must be in accordance with these instructions.
For the user’s protection, in the United Kingdom it is the law that all gas appliances
are installed by competent persons in accordance with the current edition of the Gas
Safety (Installation and Use) Regulations. Failure to install the appliance correctly
could lead to prosecution. CORGI requires its members to work to recognised
standards.
In the United Kingdom the installation must also be in accordance with:
All the relevant parts of local regulations.
All relevant codes of practice.
The relevant parts of the current editions of the following British Standards:-
BS 715
BS EN 1806 which replaces BS 1289 Part 2
BS 5440 Part 1
BS 5440 Part 2
BS 6891
BS 1251
BS EN 1856 Part 1 which replaces BS 4543 Part 2
BS 5871 Part 1
BS EN 1858 which replaces BS 1289 Part 1
BS 6461 Part 1
In England and Wales, the current edition of the Building Regulations issued by
the Department of the Environment and the Welsh Office.
In Scotland, the current edition of the Building Standards (Scotland) Regulations
issued by the Scottish Executive.
In Northern Ireland, the current edition of the Building regulations (Northern
Ireland) issued by the Department of the Environment for Northern Ireland.
In the Republic of Ireland the installation must be carried out by a competent
person and installed in accordance with:
a) The current edition of IS 813 “Domestic gas installations”.
b) All relevant national and local rules in force.
c) The current building regulations
INSTALLER GUIDE
Gas Conversion factor from net to gross efficiency
Natural Gas 0.901
LPG 0.921
© Baxi Heating U.K. Limited 2008.
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