Couple questions on the robobrew's capacity. (Newest version with pump). What is maximum amount of grain people have used at one time? What is the maximum volume you can boil without a legitimate concern for boiling over? I saw on Keg Kings website they say the malt pipe will hold 9kg of grain. Have also heard on commercials that the Robobrew will make up to 9 gallons of beer. Just curious what user experience has been like compared to these claims. Cheers!