Home > Brewing > Brew #29: House Bitter 1043

Brew #29: House Bitter 1043

September 11, 2012

The plan following the recipe designed with Graham Wheeler’s Beer Engine: start mashing with 26 litres, rinse with 6.9 litres, target 24 litres, efficiency set at 80%, hit 1045 OG.

Rinsed the malt slowly with 75degC water. Last 2.2 litres to go into the kettle had OG of 1032, after that the grain was very dry and nothing was dropping into the bucket, even when pressed from the top. Ended up with 30 litres at 1039 OG just before the boil started (86% mash efficiency). 24 litres into the fermentor at 1043 OG (76% Brewhouse efficiency).

Some other math. 2.9 litres was soaked up by grain or vapourised during the mash (32.9 in, 30 out). After the boil, hops and cooling took their share the volume was 26 litres indicating 2 litres of wastage (trub) in the kettle (measured amount was 0.85 litres, WTF!?).

So I hit the volume spot on, am two points short the OG, and the actual mash efficiency was six basis points higher than the one used for the grain bill. The plot thickens…

name House Bitter 1043
“style” Bitter
IBU                  39
EBC 28
OG 1043
brewing date 11-Sep-12
yeast Safale S-04
fermentables grain kg %
grain 1 Pale Ale 3.264 73.6%
grain 2 Munich 0.375 8.5%
grain 3 Vienna 0.375 8.5%
grain 4 Wheat 0.245 5.5%
grain 5 Crystal 150EBC 0.154 3.5%
grain 6 Black 0.024 0.5%
total 4.437 100%
hops hop gram minutes ibu
bittering Target 10.7% 25 60 27
flavour Fuggle 3.8% 31 20 7
aroma Saaz 3.4% 41 10 5
total 97 39
mash schedule minutes degC
step 1 mash in 48
step 2 10 48
step 3 30 62
step 4 20 72
step 5 10 78
Protafloc tablet
mash with 26 litres
sparge with 6.9 litres
into FV 24 litres
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Categories: Brewing