Hi a 15 Amp Circuit is good to use for 12 continuous amps, a 20 amp is good to use for up to 16 continuous amps. Anything higher than that will put a strain on the daisy chain devices. The termination on all the devices have a 60 degree rating(I won't get into that to much engineering). I think You Should plug into separate circuit. All electrical devices are meant to be use at 80% of its maximum capacity.
Hope this helps.
Hope this helps.