The maximum recommended boil volume in the Grainfather G30 is 28 L (7.4 US Gal).
This is recommended so you don't cause a boil over, you should not fill it to 30 L 7.9 US Gal).
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This is recommended so you don't cause a boil over, you should not fill it to 30 L 7.9 US Gal).