▁ ▁Bre wer y ▁engine ▁▁ ▁Tower ▁bre wer ies ▁are ▁typically ▁power ed ▁by ▁a ▁steam ▁engine , ▁which ▁gives ▁such ▁bre wer ies ▁their ▁sometimes ▁alternate ▁name ▁of ▁" ste am ▁bre wer ies ". ▁This ▁single ▁engine ▁is ▁hous ed ▁on ▁the ▁ground ▁floor . ▁The ▁engine ' s ▁primary ▁tasks ▁are ▁to ▁lift ▁the ▁two ▁main ▁ing red ients : ▁water ▁and ▁bar ley ▁m alt ▁up ▁the ▁tower ▁but ▁other ▁tasks ▁are ▁performed ▁as ▁well : ▁ ▁D riv ing ▁the ▁gr ist ▁mill , ▁to ▁cr ush ▁the ▁gra ins ▁of ▁m alt . ▁ ▁M ash ing ▁and ▁ra king ▁equipment ▁in ▁the ▁m ash ▁tun . ▁ ▁P umps ▁to ▁raise ▁hot ▁green ▁w ort ▁from ▁the ▁bre wing ▁co pper ▁up ▁to ▁the ▁cool er . ▁ ▁L ifts ▁or ▁c ran es ▁for ▁filled ▁c ask s ▁ ▁The ▁s ack ▁ho ist ▁for ▁loading ▁m alt . ▁This ▁is ▁often ▁in ▁either ▁an ▁external ▁wooden ▁housing ▁on ▁the ▁side ▁of ▁the ▁tower ▁building ▁or ▁else ▁a ▁pro tr ud ing ▁luc ar ne . ▁ ▁Bo ilers ▁to ▁supply ▁the ▁steam ▁engine ▁are ▁hous ed ▁in ▁a ▁single - store y ▁bo iler house ▁alongside ▁the ▁main ▁bre wh ouse , ▁usually ▁with ▁a ▁prominent ▁chim ney ▁to ▁provide ▁natural ▁dra ug ht . ▁Process ▁steam ▁from ▁the ▁same ▁bo ilers ▁he ats ▁the ▁large ▁quantity ▁of ▁water ▁needed ▁in ▁bre wing , ▁including ▁hot ▁liqu or ▁( water ▁used ▁in ▁m