Useful energy requirement per m2 for space heating (2008)
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The unit consumption in useful terms is calculated by multiplying the final consumption for each fuel by the heating efficiency for that fuel.
The efficiencies by fuel are the following: electricity (97%), heat (95%), LPG (75%), heating oil (72%), fuel oil (76%), hard coal (65%), lignite (65%), wood/renewable (55%), gas (80%), the values were endorsed at an ODYSSEE meeting, following a review of the values used by different countries, in particular Denmark.
The difference of variation between unit energy consumption in useful and final energy show the impact of fuel substitutions.