Adding energy to water makes it's temperature increase. This continues until it reaches 100 °C (at 1 atm) when it turns to vapor with a vaporization energy of 2257 kJ/kg. But if we lower the pressure on the water, it can start boiling at lower temperatures. In this case, would it's vaporization latent heat still be 2257 kJ/kg?
If not, how does the latent heat of water depends on boiling temperature or vapor pressure?