The next on our list of best Keurig models is the K150 fully programmable coffee maker. It features a large 90 oz water reservoir and an interactive touch screen. It is easy to refill and brews sizes from 4 to 12 oz. The removable drip tray is dishwasher safe and easy to clean, while without it the machine can accommodate travel mugs as well. The adjustable temperature allows you to control the brewing process while the auto on/off smart features makes the machine very energy efficient. What makes this one of the best Keurig machines is the fact that it is NSF certified.