I have a feeling your next post is gonna be something like "soo I let off the gas an my truck kept going faster and faster!!!! unitl i turned off the HHO unit
What is th cause of rust? is it from outside like road salt?
the cell can be insulated if heat is not an issue
maintenance is based on your setup and usage. Only YOU can figure out how often youll need to "fix" things.
assuming youre using KOH or NaOH you should only need to top off with distilled water when needed(note some electrolyte usually comes out as vapor depending on how hot the cell is. this may need to be replaced with a light solution of electrolyte). Checking hoses and replacing/cleaning any filter media is done as needed