My 6 yr matured electric hot sea electric fire have a BAD-BURNING PLASTIC SMELL and have tripped the breaker. HELP!? 6+ year old electric hot hose down heater. Has be providing EXTREMELY HOT...

6+ year old electric hot hose down heater.
Has be providing EXTREMELY HOT water just this minute.
The breakers have tripped and will not reset.
Set sour the smoke and co2 alarm in the middle of the hours of darkness.
Please recommend the best approach of getting rid...
Answers:    If it is so bad that you set sour smoke alarm I would replace the unit.Something have burned up.T-stat,heat elements or controls for elements.Time for a exotic water electric fire.
What is the device call that shuts down...
Well, something certainly have shorted out, and from your description, it may well be the aquastat. Time to nickname in the electrician or plumber for a review.