OG higher w/ full vs. partial boil?

I've done 2 full boils and probably 10 partial boils since I've started homebrewing. In both full boils, my OG has been significantly higher. Most recently, by .02 (expected 1.062 measured 1.082). None of the partial boils were off by this level.

Any thoughts? Am I extracting more points from the specialty grains with 5g vs. 2g?

Recipe: http://www.northernbrewer.com/documentation/beerkits/BelgianDubbel.pdf

Topic partial-boil full-boil original-gravity homebrew

Category Mac

1
answered at

When I go to my local HBS to get a kit made up, I have noticed that they do their best not to short me on ingredients but typically over it, sometimes by quite a bit. I assume that you got your kit from northern brewer but I can’t imagine that they don’t do something similar. Did you happen to weigh out you ingredients before you boiled?

1
answered at

I plugged your recipe into Beersmith, which comes up with a max OG of 1.064, assuming 100% efficiency extracting sugar from the 1/2 lb of specialty grains.

How did you get 1.082? Guesses:

  • Boiled the wort down too far and concentrated it. You'd have to boil off a whole gallon to get to 1.082, though.
  • Hydrometer is bad - calibrate in 60F distilled water to see
  • Misreading the hydrometer or miscalculating temperature adjustement
  • Bubbles sticking to the hydrometer, raising it up in the test tube
  • Weight/volume of ingredients off

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