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The latent heat of vaporization of liquid water is 2.5 MJ/kg. Just as an interesting comparison, the specific heat of liquid water is 4190 J/kg, so raising the temperature of water from the melting point to the boiling point takes 4190*100 = 419,000 J/kg or 0.419 MJ/kg, which is about 1/6 the energy it takes to boil it.
