Pump draw is minimal on my LG pump (less than 3A) so I'd imagine that these draw even less, and depending on the wattage of the heating element (I run a 5500W element) your draw can vary. Now let's say I ran my system full out for 3 hours, pump and element on full blast.
That would be 5860W total for 180mins, that makes 17.58KWH. Multiply this by your cost/KWH, let's just say it's pretty high at $.06 and you get $1.05. Keep in mind I've slightly overestimated things here to keep it simple, in all likleyhood you won't be running 5860W for 3 hours so your cost per brew (for fuel) is under a dollar.
Cheers!