No other coffee maker has fascinated passionate coffee drinkers like the PEBO. Monitor the eye-catching brewing process through the two firmly attached borosilicate glass bowls! Watch as the water heats in the lower chamber, creating vapor pressure that forces the boiling water up to mix with coffee grounds. The coffee maker is then removed from the heat and vacuum pressure draws the brewed coffee downward through a strainer, and into the bottom chamber for serving. Its exceptionally effective vacuum/siphon brewing method extracts all precious oils of your favorite coffee. The vacuum brewing process is entirely sealed off so no aroma can escape. In addition, the brewing time and temperature are perfectly calibrated, ensuring a perfect cup of coffee with each brew.