On Sun, 20 Jan 2008 18:40:29 -0800 (PST),
wrote:

That is the problem. I am not sure if the heater stays full of water
or if it freezes too when no gas is in.

It's inside a heated part of the house, right?
It should not freeze if it is.
Just be sure the heat gets to it, for example, if its in a closet,
open the door. You might turn your heat up a few degrees tonite if
that makes you feel better.