Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

  A simple solution for 'small' engines.  Weigh it dry, then weigh it wet.
Experiment - run a few minutes, then weigh....then repeat at regular
intervals, KEEPING A LOG BOOK (not for me, I keep it in my dusty, crowded
memory).  Now you know how much water you use per unit of run time and can
easily calculate when the level is at a minimum safety level.  What is a
minimum is up to you and your nerve.

Good Luck,
Wayne