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Aug
13
2012

First All Grain

I just finished my first attempt at an all-grain brew tonight. The process was similar to my partial mash process except no malt extract was used. Due to the restrictions of brewing on top of my stove and available pots, I went for a smaller batch volume of 13 litres. I think it all went fine but the proof will be in the drinking. It will be very interesting to compare this with my previous partial mash batch which was a similarly hopped pale ale.

I mashed 3kg of grain, which I crushed in my converted pasta maker grain mill, in a bag in my 20L pot with 9 litres of water. I was shooting for a mash temp of 68C but the temp had actually crept up into the low 70s by the end of the mash due to me leaving the inner ring on at the lowest setting. Next time I’ll leave it off and see how well the pot holds the temp wrapped in a towel and ski jacket.

I batch sparged in my 12L pot with 7 litres of water poured over the top of the grain in the bag. Then I mixed the runnings in the 20L pot and got about 14 litres. I split these between 2 pots for the boil. My SG was 1.049, giving me a brewhouse efficiency of around 73% which I believe is quite decent for this type of mashing process.

I had a little bit of trouble getting a good rolling boil in my 20L pot as the bottom of the pot has a concave center which I think makes it much less efficient on the ceramic electric stovetop. Later on in the boil, when the volumes had reduced, I ended up ditching it altogether and putting the extra wort into another 5L pot.

I cooled in ice water. It took 30 minutes to get it down to 16.5C, so I overshot a bit (22C would have been fine) and didn’t actually need to spend quite as long cooling.

I ended up with about 11L in the fermentor after evaporation loss so I topped it up with cold water to my 13L target. After giving it a good shaking to aerate, I pitched the US05 yeast that I had harvested from the previous batch.

Fermentation got off to a quick start – the airlock was bubbling and krausen had formed as soon as I checked it in the morning.

See the recipe and specs here.

1 comment

  1. Matt says:

    Sounds good! It was good at the competition!

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