I've spent hours around that heater and noticed no issues. It is plugged into a power strip with a 15 amp breaker. So it's close to tripping. Any short will trip it. The boat's circuit breaker for all outlets is 16 amps. How is it different from being at our house?
Can one set the heater on low to increase safety? Of course then I'd need two of them.
Are the West Marine heaters any better?
P.S. Interior is not purple. Not sure why it looks that way.