The gross calorific value of the fuel has been used for this efficiency calculation. The
test data from which it has been calculated has been certified by Advantica
Certification services (0087). The efficiency value may be used in the UK
Government's Standard Assessment Procedure (SAP) for energy rating of dwellings.
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.
4.3 NO
x
For NG the 'Weighted' result for this appliance equates to NO
x
Class 5.
For LPG the 'Weighted' result for this appliance equates to NO
x
Class 4.
5. GENERAL INSTALLATION REQUIREMENTS
5.1 Regulations, Standards and Law.
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. GAS SAFE REGISTER require their 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 EN 1856 Part 1 Chimneys - Requirements for metal chimneys.
BS 5440 Part 1 Installation of flues.
BS 5440 Part 2 Installation and maintenance of flues and ventilation for gas
appliances of rated input not exceeding 70 kW net (1st, 2nd
and 3rd family gases).
BS 6461 Part 1 Masonry chimney & flues - Installation.
BS 1251 Fireplace components.
BS 5871 Part 2 Installation - Inset LFE gas fires.
BS 6891 Gas pipework installation.
- In England and Wales, the current edition of the Building Regulations issued by the
Department of the Environment and the Welsh Office.
© GDC Group Ltd. 2013
Page 10
Gas Conversion factor from net to gross efficiency
Natural Gas 0.901
LPG 0.921
INSTALLER GUIDE
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