If you were using a heating system that uses hot water, ie steam or
baseboards. If these systems leak, they are suppose to automatically
add water to the system. If it cant get any water and runs low it can
damage the boiler.

Doesnt really pertain to the original posters question because he
mentioned that he is using forced hot air (doesnt use water)

Never the less, good tip to remember though. Nothing like coming home
to a cooked
boiler and having to spend a few grand to replace....