The BUNNÂ® HGD Phase Brewâ„¢ High Altitude 8 Cup Home Brewer is specifically designed for use in high altitude areas, which includes a specially engineered thermostat for use above 4,000 feet and above. Unlike ordinary machines, the Phase Brew doesn't ''drip'' right away. In fact, it doesn't drip at all. That's because the revolutionary Heat & Release Technology heats all the water to the right temperature during the 6-minute heating phase, then quickly releases it through the unique sprayhead for an optimal 4-minute brewing phase and amazing coffee flavor. BUNN Phase Brew - Brews better, not bitter.