ENE 06 - Boiler efficiency

Determining boiler efficiency - KBCN1223

The boiler efficiency should be based on the Higher Heating Value (HHV) or the Gross Calorific Value (GCV). Where the information related to the efficiency of the boiler is only available in Lower Heating Value (LHV) or Net Calorific Value (NCV), it will need to converted using the following formula: HHV = LHV x 0.9 GCV = NCV x 0.9

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Energy – MBtu definition - KBCN1423

The abbreviation MBtu can have two differing definitions. For the purposes of BREEAM In-Use, the following will be used:

• 1 MBtu = 1,000 Btu 

• 1 MMBtu = 1,000,000 Btu 

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