Originally Posted by sanch
how long does one 5500 w element take to boil 10 gal i have seen a calculation somewhere and cant find it now?
from 70 -> boil = 40 minutes
from 170 (mash-out) -> boil = 12 minutes
I'm moving up to 10 gallon batches (13 gallon pre-boil) using a 4500W element -- just over 20 minutes from mash-out to boil. Only tested with water, but wort shouldn't be much different.
BTW: I have a spreadsheet, but can't find the original source of it for the calculations.