Originally Posted by plaplant
I know there is a difference between mash efficiency and totally brew house efficiency but I am a little confused what the difference is.
Mash/lauter efficiency measures the percentage of available sugars that actually made it to the boil kettle. If your mash efficiency is lower than expected, you want to look at aspects of your mashing process to figure out what's causing the low efficiency.
Brewhouse efficiency takes into account all possible losses that don't make it to the fermenter. So, not only low mash yield (i.e., poor mash efficiency), but also losses attributable to boil off, during transfer, etc. Therefore, brewhouse efficiency is measure of the entire system, and mash efficiency is a part of that.
By tracking the efficiencies separately, it may be easier to zero in on the parts of the process that are giving you trouble.