
4.2 Efficiency.
The efficiency of this appliance has been measured as specified in BS 7977 - 1 and
the results are as below :
Model
Efficiency % (Gross)
Efficiency % (Net)
600RC & 600FS Inspire
68%
75%
800RC & 800RC Inspire
72%
80%
The gross calorific value of the fuel has been used for this efficiency calculation.
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 these appliances equates to
NO
x
Class 4.
©
GDC Group Ltd. AUG 2016
Page 12
INSTALLER GUIDE
Gas
Conversion factor from
net
to
gross
efficiency
Natural Gas
0.901