Wednesday, November 12, 2014

Extract vs All Grain

 All Grain (left) and Extract (right)
A side by side comparison of  two American Pilsners.

The cost of making beer with extract compared to making it with all-grain is occasionally debated, but when it is, it's always fierce. The goal of this comparison was to see what makes sense for me. The results here are not to say that any one is better than the other. It's really just me sharing my personal decision. If you are curious if all-grain or extract costs more for you I encourage you to perform the evaluation using your own economic factors.

These two beers were brewed as close to each other as possible with the exception that one is all grain, and the other is extract based.  Hop tea was made ahead of time to use for several batches of beer with high alpha hops and a two hour boil time.  See my book for more details.

1.5 gallon batch size
OG: 1.069
FG:  1.017
IBU: 32
SRM: 4
Fermented at 56°F

The cost of heating the water for the all grain batch was appreciable. Between the mash, sparge, and boil my burner was on full tilt for 2 hours. My last gas bill indicates that natural gas costs me $0.0139 per cubic foot.  At that rate my stove costs $1.67 per hour to run one burner at full heat.  That's $3.34 in fuel costs.  The amount of heat use to make the hop tea was trivial by comparison.

For extract brewing I use distilled water because the minerals are already in the extract. This costs $0.75 per gallon at my local grocery store which added $1.13 to the extract beer. When brewing all-grain I use tap water because the mineral content is needed for acidification of the mash, among other things. By comparison, the tap water is virtually free.

Making the extract took 12 minutes from weighing the first ingredient to pitching the yeast.  The all grain batch took 5 hours.

All grain methods typically loss 20% of the beer to trub, although with this batch it was 29%.   It is common to start with 6 gallons at the end of the boil, transfer 5.5 to the fermentor and have 5 gallons for bottling.  When brewing with extract the trub losses are lower because extract as already been boiled once.  This means that the extract has already gone through one hot break.  This batch was fairly typical at 10% trub loss.

But how do they taste? that's the real question.  To judge the verdict of taste, I selected half a dozen of my friends be the lucky ones. (Well... Really I begged and pleaded to persuaded them to compare the two beers.  Same thing right?)  In a blind tasting of these beers none of them preferred the all grain beer, and some of them preferred the extract beer! I was shocked. So I made a second beer. This time it was an IPA instead of a Pilsner, and the response was the same.

The difference in cell density was interesting.  After bottling the beer the remaining slurry was weighted. Because the two had the same starting gravity, yeast strain and fermentation conditions the total number of yeast cells produced should be nearly identical.  The all grain batch had 1,124g of slurry remaining while the extract batch measured it at only 326g.  This means that the cell density of the extract batch was about 3 times higher than that of the all grain.  This means when storing yeast, the same number of cells taken from extract beers take up about one third of the space in your fridge compared to all grain.

A recipe that used more specialty malts would have allowed the all-grain batch to shine, but with a steep or partial mash the same flavors could be imparted on the extract batch.

Monday, November 10, 2014

Another Article on Home Brew Talk

I've been busy working on another article for Home Brew Talk, "4 Tips for Making Great Beer in 15 Minutes." It's the first in a series of 15 minute beer articles that I'm working on. Check it out here, Thanks!