BUNN 12 Cup Airpot Coffee Brewer (Automatic model) Model CWTF15-APS. (Automatic Model) BUNN product number 23001.0006. Brews 3.8 to 7.5 gallons (14.4 to 28.4 litres) of perfect coffee per hour. Brews directly into 1.9 to 3 litre airpots. Convenient airpots keep coffee hot and fresh for hours. Airpots are easily transported to remote meeting rooms, breakfast bars, etc. Plastic Funnel (Airpots sold separately, see decanters pots and servers page)