The vacuum coffeemaker, also known as a siphon coffeemaker, is similar to the Italian stove-top espresso maker. It's set over a stove burner and pressure forces water from the lower chamber into the upper chamber containing the ground coffee. The difference is, it's made of glass, and after it is removed from heat, the coffee filters back down through a filter into the bottom chamber where it is ready to be served. The chambers are also microwave-safe, making reheating a lot easier.