On Thu, 09 Oct 2008 21:39:08 +0100, David Hansen
wrote:

On Thu, 9 Oct 2008 17:54:21 +0100 someone who may be "Mary Fisher"
wrote this:-

water isn't going to get to over 100C by any system.

Water only boils at 100C under atmospheric pressure. Water can be
liquid, rather than steam at over 100C, if it is pressurised
sufficiently. The word water doesn't really convey the energy
contained in this stuff, it is best to think of it as liquid steam.

Latent heat?

Systems of this type are in common use in industry and large scale
heating systems.

snip