Hmm, so with W=V*A you're looking at a max of 2400w on that 20a 120v circuit. but from my understanding it's not recommended to pull more than 80% on any given breaker - having said that, I'm totally not any sort of expert in this field, so hopefully someone else chimes in.
Anyway, at any given time you're probably not actually pulling the full wattage on your boil coil and pumps, startup draw/surge for the pumps and coil (?) could push it over the limit?