You haven't understood a fucking word.
Water doesn't change in volume. Its volume is effectively constant (unless you want to be really pedantic) so the change in boiling point has nothing to do with volume.
When you heat water its volume increases, when you cool it then it decreases.
I remember reading that to increase temperature you can compress. Maybe that was only for gasses because liquids are already so dense.
PS: I do like being pedantic, so if you care to elaborate I shall enjoy it
What is indisputable though is that the boiling point of water does vary based on atmospheric pressure, it's only 100c at the pressure experienced at sea level on Earth. A higher pressure will result in the water remaining a liquid beyond 100c so it won't be steam.
I see, but still I dont think life as we know it can exist at any temperatures above 100C anyway.
There are life forms on Earth that live at around 400c.
Rising as high as 15 stories off the ocean floor at depths of 7,000 feet (2,100 meters), hydrothermal vents that spew acidic, mineral rich water are the places to be - if you can stand the heat. The water coming out of the vents can reach temperatures as high as 750°F (400°C), but that's just fine to undersea thermophiles.
http://www.livescience.com/animals/050207_extremophiles.html400F is only 204C