1 litre of Propane = 0.274m3 vapour gas gross.
1m3 Propane = 25.87kw/m3 gross or 23.73kw/m3 net.
Therefore 1 litre = 6.50kwh
Kerosene = 9.8kwh/litre net
Therefore 1 litre = 9.8kwh
You might also find that Calor's price of €0.53 per litre is plus carbon tax, plus vat, plus government levies, plus tank rental, etc.
What will the price go upto in 1 years time also?
At the moment, kerosene is €0.65 per 1,000 litres and €0.68 per 500 litres.
At this price, it's nearly on par with natural gas.
If the price is inclusive, to compare:
Kerosene @ €0.65 per litre = €0.066 per kwh
Propane @ €0.54 per litre = €0.083 per kwh
However at €0.80 per litre = €0.123 per kwh!