The only thing I'd like to add to what's already been said is use pure peanut oil. It's quite expensive but worth it.
Do not I repeat do not leave that fryer unattended at all Period.
18.5" Weber Smokey Mountain
22.5" Weber OTG with Cajun Bandit Conversion Kit
Char-Griller Akorn with side cart
1999 Weber Master-Touch - bent but not broken
14.5" Weber Smokey Joe Silver