Note : The efficiency of the appliance has been measured as specified in BS7977-1 2009+
A1:2013 and the net efficiency rate is 74.4% for natural gas and 74.8% for LPG. The gross calorific
value of the fuel has been used for this efficiency calculation. Gastec have certified the test
data from which it has been calculated. The efficiency value may be used in the UK
Government’s Standard Assessment Procedure (SAP) for energy rating of the dwelling. Within the
appliance packaging will be an outlet restrictor, this is there to achieve the maximum efficiency.
This, however may not be fitted due to the flue underperforming.