re: Homebrewing: Brewing in process thread (with pics)

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To be honest I have no idea what the difference is?

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Mash efficiency is your pre-boil SG measured agaisnt percent of fermentable sugars from the grain. Basically, how well you extracted sugars from the grain.

Brewhouse efficiency takes into account mash eff + the effects of the post-boil wort. So since i was left with only 4.5 gallons instead of 5, i did not get a great brewhouse efficiency. It also takes into effect other things such as Pre ferm. OG, and other factors i'm not sure of. If i would have ended up with 5 gallons, i would have had a brewhouse eff of about 72%.

Basically Frat, it's what you were talking about earlier in the thread. My mash was conducted properly, i just had too much evaporation in my boil. I should have collected about .75 gallons more wort, which might have reduced my mash efficiency, but i don't know.